diff --git a/android/GKI_VERSION b/android/GKI_VERSION
index 530a3c769770..3ecf1f8c3cd4 100644
--- a/android/GKI_VERSION
+++ b/android/GKI_VERSION
@@ -1 +1 @@
-LTS_5.4.147_e785a25f5262
+LTS_5.4.147_983a7e7c981b
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index e6a91eaebe6a..5d1af9456f7c 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -1644,6 +1644,12 @@ static void binder_free_transaction(struct binder_transaction *t)
 
 	if (target_proc) {
 		binder_inner_proc_lock(target_proc);
+		target_proc->outstanding_txns--;
+		if (target_proc->outstanding_txns < 0)
+			pr_warn("%s: Unexpected outstanding_txns %d\n",
+				__func__, target_proc->outstanding_txns);
+		if (!target_proc->outstanding_txns && target_proc->is_frozen)
+			wake_up_interruptible_all(&target_proc->freeze_wait);
 		if (t->buffer)
 			t->buffer->transaction = NULL;
 		binder_inner_proc_unlock(target_proc);
@@ -2185,7 +2191,8 @@ static int binder_translate_binder(struct flat_binder_object *fp,
 		ret = -EINVAL;
 		goto done;
 	}
-	if (security_binder_transfer_binder(proc->tsk, target_proc->tsk)) {
+	if (security_binder_transfer_binder(binder_get_cred(proc),
+					    binder_get_cred(target_proc))) {
 		ret = -EPERM;
 		goto done;
 	}
@@ -2231,7 +2238,8 @@ static int binder_translate_handle(struct flat_binder_object *fp,
 				  proc->pid, thread->pid, fp->handle);
 		return -EINVAL;
 	}
-	if (security_binder_transfer_binder(proc->tsk, target_proc->tsk)) {
+	if (security_binder_transfer_binder(binder_get_cred(proc),
+					    binder_get_cred(target_proc))) {
 		ret = -EPERM;
 		goto done;
 	}
@@ -2319,7 +2327,8 @@ static int binder_translate_fd(u32 fd, binder_size_t fd_offset,
 		ret = -EBADF;
 		goto err_fget;
 	}
-	ret = security_binder_transfer_file(proc->tsk, target_proc->tsk, file);
+	ret = security_binder_transfer_file(binder_get_cred(proc),
+					    binder_get_cred(target_proc), file);
 	if (ret < 0) {
 		ret = -EPERM;
 		goto err_security;
@@ -2475,10 +2484,11 @@ static int binder_fixup_parent(struct binder_transaction *t,
  * If the @thread parameter is not NULL, the transaction is always queued
  * to the waitlist of that specific thread.
  *
- * Return:	true if the transactions was successfully queued
- *		false if the target process or thread is dead
+ * Return:	0 if the transaction was successfully queued
+ *		BR_DEAD_REPLY if the target process or thread is dead
+ *		BR_FROZEN_REPLY if the target process or thread is frozen
  */
-static bool binder_proc_transaction(struct binder_transaction *t,
+static int binder_proc_transaction(struct binder_transaction *t,
 				    struct binder_proc *proc,
 				    struct binder_thread *thread)
 {
@@ -2502,11 +2512,16 @@ static bool binder_proc_transaction(struct binder_transaction *t,
 	}
 
 	binder_inner_proc_lock(proc);
+	if (proc->is_frozen) {
+		proc->sync_recv |= !oneway;
+		proc->async_recv |= oneway;
+	}
 
-	if (proc->is_dead || (thread && thread->is_dead)) {
+	if ((proc->is_frozen && !oneway) || proc->is_dead ||
+			(thread && thread->is_dead)) {
 		binder_inner_proc_unlock(proc);
 		binder_node_unlock(node);
-		return false;
+		return proc->is_frozen ? BR_FROZEN_REPLY : BR_DEAD_REPLY;
 	}
 
 	if (!thread && !pending_async)
@@ -2525,10 +2540,11 @@ static bool binder_proc_transaction(struct binder_transaction *t,
 	if (!pending_async)
 		binder_wakeup_thread_ilocked(proc, thread, !oneway /* sync */);
 
+	proc->outstanding_txns++;
 	binder_inner_proc_unlock(proc);
 	binder_node_unlock(node);
 
-	return true;
+	return 0;
 }
 
 /**
@@ -2718,8 +2734,8 @@ static void binder_transaction(struct binder_proc *proc,
 			goto err_dead_binder;
 		}
 		e->to_node = target_node->debug_id;
-		if (security_binder_transaction(proc->tsk,
-						target_proc->tsk) < 0) {
+		if (security_binder_transaction(binder_get_cred(proc),
+						binder_get_cred(target_proc)) < 0) {
 			return_error = BR_FAILED_REPLY;
 			return_error_param = -EPERM;
 			return_error_line = __LINE__;
@@ -2854,7 +2870,7 @@ static void binder_transaction(struct binder_proc *proc,
 		u32 secid;
 		size_t added_size;
 
-		security_task_getsecid(proc->tsk, &secid);
+		security_cred_getsecid(binder_get_cred(proc), &secid);
 		ret = security_secid_to_secctx(secid, &secctx, &secctx_sz);
 		if (ret) {
 			return_error = BR_FAILED_REPLY;
@@ -3168,12 +3184,14 @@ static void binder_transaction(struct binder_proc *proc,
 		binder_enqueue_thread_work(thread, tcomplete);
 		binder_inner_proc_lock(target_proc);
 		if (target_thread->is_dead) {
+			return_error = BR_DEAD_REPLY;
 			binder_inner_proc_unlock(target_proc);
 			goto err_dead_proc_or_thread;
 		}
 		BUG_ON(t->buffer->async_transaction != 0);
 		binder_pop_transaction_ilocked(target_thread, in_reply_to);
 		binder_enqueue_thread_work_ilocked(target_thread, &t->work);
+		target_proc->outstanding_txns++;
 		binder_inner_proc_unlock(target_proc);
 		wake_up_interruptible_sync(&target_thread->wait);
 		trace_android_vh_binder_restore_priority(in_reply_to, current);
@@ -3194,7 +3212,9 @@ static void binder_transaction(struct binder_proc *proc,
 		t->from_parent = thread->transaction_stack;
 		thread->transaction_stack = t;
 		binder_inner_proc_unlock(proc);
-		if (!binder_proc_transaction(t, target_proc, target_thread)) {
+		return_error = binder_proc_transaction(t,
+				target_proc, target_thread);
+		if (return_error) {
 			binder_inner_proc_lock(proc);
 			binder_pop_transaction_ilocked(thread, t);
 			binder_inner_proc_unlock(proc);
@@ -3204,7 +3224,8 @@ static void binder_transaction(struct binder_proc *proc,
 		BUG_ON(target_node == NULL);
 		BUG_ON(t->buffer->async_transaction != 1);
 		binder_enqueue_thread_work(thread, tcomplete);
-		if (!binder_proc_transaction(t, target_proc, NULL))
+		return_error = binder_proc_transaction(t, target_proc, NULL);
+		if (return_error)
 			goto err_dead_proc_or_thread;
 	}
 	if (target_thread)
@@ -3221,7 +3242,6 @@ static void binder_transaction(struct binder_proc *proc,
 	return;
 
 err_dead_proc_or_thread:
-	return_error = BR_DEAD_REPLY;
 	return_error_line = __LINE__;
 	binder_dequeue_work(proc, tcomplete);
 err_translate_failed:
@@ -3846,7 +3866,7 @@ static int binder_wait_for_work(struct binder_thread *thread,
 		binder_inner_proc_lock(proc);
 		list_del_init(&thread->waiting_thread_node);
 		if (signal_pending(current)) {
-			ret = -ERESTARTSYS;
+			ret = -EINTR;
 			break;
 		}
 	}
@@ -4451,9 +4471,14 @@ static struct binder_thread *binder_get_thread(struct binder_proc *proc)
 static void binder_free_proc(struct binder_proc *proc)
 {
 	struct binder_device *device;
+	struct binder_proc_ext *eproc =
+		container_of(proc, struct binder_proc_ext, proc);
 
 	BUG_ON(!list_empty(&proc->todo));
 	BUG_ON(!list_empty(&proc->delivered_death));
+	if (proc->outstanding_txns)
+		pr_warn("%s: Unexpected outstanding_txns %d\n",
+			__func__, proc->outstanding_txns);
 	device = container_of(proc->context, struct binder_device, context);
 	if (refcount_dec_and_test(&device->ref)) {
 		kfree(proc->context->name);
@@ -4461,8 +4486,9 @@ static void binder_free_proc(struct binder_proc *proc)
 	}
 	binder_alloc_deferred_release(&proc->alloc);
 	put_task_struct(proc->tsk);
+	put_cred(eproc->cred);
 	binder_stats_deleted(BINDER_STAT_PROC);
-	kfree(proc);
+	kfree(eproc);
 }
 
 static void binder_free_thread(struct binder_thread *thread)
@@ -4516,6 +4542,7 @@ static int binder_thread_release(struct binder_proc *proc,
 			     (t->to_thread == thread) ? "in" : "out");
 
 		if (t->to_thread == thread) {
+			thread->proc->outstanding_txns--;
 			t->to_proc = NULL;
 			t->to_thread = NULL;
 			if (t->buffer) {
@@ -4538,23 +4565,20 @@ static int binder_thread_release(struct binder_proc *proc,
 	__release(&t->lock);
 
 	/*
-	 * If this thread used poll, make sure we remove the waitqueue
-	 * from any epoll data structures holding it with POLLFREE.
-	 * waitqueue_active() is safe to use here because we're holding
-	 * the inner lock.
+	 * If this thread used poll, make sure we remove the waitqueue from any
+	 * poll data structures holding it.
 	 */
-	if ((thread->looper & BINDER_LOOPER_STATE_POLL) &&
-	    waitqueue_active(&thread->wait)) {
-		wake_up_poll(&thread->wait, EPOLLHUP | POLLFREE);
-	}
+	if (thread->looper & BINDER_LOOPER_STATE_POLL)
+		wake_up_pollfree(&thread->wait);
 
 	binder_inner_proc_unlock(thread->proc);
 
 	/*
-	 * This is needed to avoid races between wake_up_poll() above and
-	 * and ep_remove_waitqueue() called for other reasons (eg the epoll file
-	 * descriptor being closed); ep_remove_waitqueue() holds an RCU read
-	 * lock, so we can be sure it's done after calling synchronize_rcu().
+	 * This is needed to avoid races between wake_up_pollfree() above and
+	 * someone else removing the last entry from the queue for other reasons
+	 * (e.g. ep_remove_wait_queue() being called due to an epoll file
+	 * descriptor being closed).  Such other users hold an RCU read lock, so
+	 * we can be sure they're done after we call synchronize_rcu().
 	 */
 	if (thread->looper & BINDER_LOOPER_STATE_POLL)
 		synchronize_rcu();
@@ -4672,7 +4696,7 @@ static int binder_ioctl_set_ctx_mgr(struct file *filp,
 		ret = -EBUSY;
 		goto out;
 	}
-	ret = security_binder_set_context_mgr(proc->tsk);
+	ret = security_binder_set_context_mgr(binder_get_cred(proc));
 	if (ret < 0)
 		goto out;
 	if (uid_valid(context->binder_context_mgr_uid)) {
@@ -4766,6 +4790,100 @@ static int binder_ioctl_get_node_debug_info(struct binder_proc *proc,
 	return 0;
 }
 
+static bool binder_txns_pending_ilocked(struct binder_proc *proc)
+{
+	struct rb_node *n;
+	struct binder_thread *thread;
+
+	if (proc->outstanding_txns > 0)
+		return true;
+
+	for (n = rb_first(&proc->threads); n; n = rb_next(n)) {
+		thread = rb_entry(n, struct binder_thread, rb_node);
+		if (thread->transaction_stack)
+			return true;
+	}
+	return false;
+}
+
+static int binder_ioctl_freeze(struct binder_freeze_info *info,
+			       struct binder_proc *target_proc)
+{
+	int ret = 0;
+
+	if (!info->enable) {
+		binder_inner_proc_lock(target_proc);
+		target_proc->sync_recv = false;
+		target_proc->async_recv = false;
+		target_proc->is_frozen = false;
+		binder_inner_proc_unlock(target_proc);
+		return 0;
+	}
+
+	/*
+	 * Freezing the target. Prevent new transactions by
+	 * setting frozen state. If timeout specified, wait
+	 * for transactions to drain.
+	 */
+	binder_inner_proc_lock(target_proc);
+	target_proc->sync_recv = false;
+	target_proc->async_recv = false;
+	target_proc->is_frozen = true;
+	binder_inner_proc_unlock(target_proc);
+
+	if (info->timeout_ms > 0)
+		ret = wait_event_interruptible_timeout(
+			target_proc->freeze_wait,
+			(!target_proc->outstanding_txns),
+			msecs_to_jiffies(info->timeout_ms));
+
+	/* Check pending transactions that wait for reply */
+	if (ret >= 0) {
+		binder_inner_proc_lock(target_proc);
+		if (binder_txns_pending_ilocked(target_proc))
+			ret = -EAGAIN;
+		binder_inner_proc_unlock(target_proc);
+	}
+
+	if (ret < 0) {
+		binder_inner_proc_lock(target_proc);
+		target_proc->is_frozen = false;
+		binder_inner_proc_unlock(target_proc);
+	}
+
+	return ret;
+}
+
+static int binder_ioctl_get_freezer_info(
+				struct binder_frozen_status_info *info)
+{
+	struct binder_proc *target_proc;
+	bool found = false;
+	__u32 txns_pending;
+
+	info->sync_recv = 0;
+	info->async_recv = 0;
+
+	mutex_lock(&binder_procs_lock);
+	hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
+		if (target_proc->pid == info->pid) {
+			found = true;
+			binder_inner_proc_lock(target_proc);
+			txns_pending = binder_txns_pending_ilocked(target_proc);
+			info->sync_recv |= target_proc->sync_recv |
+					(txns_pending << 1);
+			info->async_recv |= target_proc->async_recv;
+			binder_inner_proc_unlock(target_proc);
+		}
+	}
+	mutex_unlock(&binder_procs_lock);
+
+	if (!found)
+		return -EINVAL;
+
+	return 0;
+}
+
 static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	int ret;
@@ -4884,6 +5002,84 @@ static long binder_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		}
 		break;
 	}
+	case BINDER_FREEZE: {
+		struct binder_freeze_info info;
+		struct binder_proc **target_procs = NULL, *target_proc;
+		int target_procs_count = 0, i = 0;
+
+		ret = 0;
+
+		if (copy_from_user(&info, ubuf, sizeof(info))) {
+			ret = -EFAULT;
+			goto err;
+		}
+
+		mutex_lock(&binder_procs_lock);
+		hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
+			if (target_proc->pid == info.pid)
+				target_procs_count++;
+		}
+
+		if (target_procs_count == 0) {
+			mutex_unlock(&binder_procs_lock);
+			ret = -EINVAL;
+			goto err;
+		}
+
+		target_procs = kcalloc(target_procs_count,
+				       sizeof(struct binder_proc *),
+				       GFP_KERNEL);
+
+		if (!target_procs) {
+			mutex_unlock(&binder_procs_lock);
+			ret = -ENOMEM;
+			goto err;
+		}
+
+		hlist_for_each_entry(target_proc, &binder_procs, proc_node) {
+			if (target_proc->pid != info.pid)
+				continue;
+
+			binder_inner_proc_lock(target_proc);
+			target_proc->tmp_ref++;
+			binder_inner_proc_unlock(target_proc);
+
+			target_procs[i++] = target_proc;
+		}
+		mutex_unlock(&binder_procs_lock);
+
+		for (i = 0; i < target_procs_count; i++) {
+			if (ret >= 0)
+				ret = binder_ioctl_freeze(&info,
+							  target_procs[i]);
+
+			binder_proc_dec_tmpref(target_procs[i]);
+		}
+
+		kfree(target_procs);
+
+		if (ret < 0)
+			goto err;
+		break;
+	}
+	case BINDER_GET_FROZEN_INFO: {
+		struct binder_frozen_status_info info;
+
+		if (copy_from_user(&info, ubuf, sizeof(info))) {
+			ret = -EFAULT;
+			goto err;
+		}
+
+		ret = binder_ioctl_get_freezer_info(&info);
+		if (ret < 0)
+			goto err;
+
+		if (copy_to_user(ubuf, &info, sizeof(info))) {
+			ret = -EFAULT;
+			goto err;
+		}
+		break;
+	}
 	default:
 		ret = -EINVAL;
 		goto err;
@@ -4893,7 +5089,7 @@ err:
 	if (thread)
 		thread->looper_need_return = false;
 	wait_event_interruptible(binder_user_error_wait, binder_stop_on_user_error < 2);
-	if (ret && ret != -ERESTARTSYS)
+	if (ret && ret != -EINTR)
 		pr_info("%d:%d ioctl %x %lx returned %d\n", proc->pid, current->pid, cmd, arg, ret);
 err_unlocked:
 	trace_binder_ioctl_done(ret);
@@ -4974,6 +5170,7 @@ err_bad_arg:
 static int binder_open(struct inode *nodp, struct file *filp)
 {
 	struct binder_proc *proc, *itr;
+	struct binder_proc_ext *eproc;
 	struct binder_device *binder_dev;
 	struct binderfs_info *info;
 	struct dentry *binder_binderfs_dir_entry_proc = NULL;
@@ -4982,14 +5179,17 @@ static int binder_open(struct inode *nodp, struct file *filp)
 	binder_debug(BINDER_DEBUG_OPEN_CLOSE, "%s: %d:%d\n", __func__,
 		     current->group_leader->pid, current->pid);
 
-	proc = kzalloc(sizeof(*proc), GFP_KERNEL);
+	eproc = kzalloc(sizeof(*eproc), GFP_KERNEL);
+	proc = &eproc->proc;
 	if (proc == NULL)
 		return -ENOMEM;
 	spin_lock_init(&proc->inner_lock);
 	spin_lock_init(&proc->outer_lock);
 	get_task_struct(current->group_leader);
 	proc->tsk = current->group_leader;
+	eproc->cred = get_cred(filp->f_cred);
 	INIT_LIST_HEAD(&proc->todo);
+	init_waitqueue_head(&proc->freeze_wait);
 	if (binder_supported_policy(current->policy)) {
 		proc->default_priority.sched_policy = current->policy;
 		proc->default_priority.prio = current->normal_prio;
@@ -5209,6 +5409,9 @@ static void binder_deferred_release(struct binder_proc *proc)
 	proc->tmp_ref++;
 
 	proc->is_dead = true;
+	proc->is_frozen = false;
+	proc->sync_recv = false;
+	proc->async_recv = false;
 	threads = 0;
 	active_transactions = 0;
 	while ((n = rb_first(&proc->threads))) {
diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h
index 9765fde875a5..7c5993bcfc10 100644
--- a/drivers/android/binder_internal.h
+++ b/drivers/android/binder_internal.h
@@ -388,9 +388,24 @@ struct binder_priority {
  *                        (protected by binder_deferred_lock)
  * @deferred_work:        bitmap of deferred work to perform
  *                        (protected by binder_deferred_lock)
+ * @outstanding_txns:     number of transactions to be transmitted before
+ *                        processes in freeze_wait are woken up
+ *                        (protected by @inner_lock)
  * @is_dead:              process is dead and awaiting free
  *                        when outstanding transactions are cleaned up
  *                        (protected by @inner_lock)
+ * @is_frozen:            process is frozen and unable to service
+ *                        binder transactions
+ *                        (protected by @inner_lock)
+ * @sync_recv:            process received sync transactions since last frozen
+ *                        bit 0: received sync transaction after being frozen
+ *                        bit 1: new pending sync transaction during freezing
+ *                        (protected by @inner_lock)
+ * @async_recv:           process received async transactions since last frozen
+ *                        (protected by @inner_lock)
+ * @freeze_wait:          waitqueue of processes waiting for all outstanding
+ *                        transactions to be processed
+ *                        (protected by @inner_lock)
  * @todo:                 list of work for this process
  *                        (protected by @inner_lock)
  * @stats:                per-process binder statistics
@@ -431,7 +446,12 @@ struct binder_proc {
 	struct task_struct *tsk;
 	struct hlist_node deferred_work_node;
 	int deferred_work;
+	int outstanding_txns;
 	bool is_dead;
+	bool is_frozen;
+	bool sync_recv;
+	bool async_recv;
+	wait_queue_head_t freeze_wait;
 
 	struct list_head todo;
 	struct binder_stats stats;
@@ -449,6 +469,29 @@ struct binder_proc {
 	struct dentry *binderfs_entry;
 };
 
+/**
+ * struct binder_proc_ext - binder process bookkeeping
+ * @proc:            element for binder_procs list
+ * @cred                  struct cred associated with the `struct file`
+ *                        in binder_open()
+ *                        (invariant after initialized)
+ *
+ * Extended binder_proc -- needed to add the "cred" field without
+ * changing the KMI for binder_proc.
+ */
+struct binder_proc_ext {
+	struct binder_proc proc;
+	const struct cred *cred;
+};
+
+static inline const struct cred *binder_get_cred(struct binder_proc *proc)
+{
+	struct binder_proc_ext *eproc;
+
+	eproc = container_of(proc, struct binder_proc_ext, proc);
+	return eproc->cred;
+}
+
 /**
  * struct binder_thread - binder thread bookkeeping
  * @proc:                 binder process for this thread
diff --git a/drivers/hid/Kconfig b/drivers/hid/Kconfig
index 45966d4e5274..abcd2eb8f528 100644
--- a/drivers/hid/Kconfig
+++ b/drivers/hid/Kconfig
@@ -206,14 +206,14 @@ config HID_CHERRY
 
 config HID_CHICONY
 	tristate "Chicony devices"
-	depends on HID
+	depends on USB_HID
 	default !EXPERT
 	---help---
 	Support for Chicony Tactical pad and special keys on Chicony keyboards.
 
 config HID_CORSAIR
 	tristate "Corsair devices"
-	depends on HID && USB && LEDS_CLASS
+	depends on USB_HID && LEDS_CLASS
 	---help---
 	Support for Corsair devices that are not fully compliant with the
 	HID standard.
@@ -244,7 +244,7 @@ config HID_MACALLY
 
 config HID_PRODIKEYS
 	tristate "Prodikeys PC-MIDI Keyboard support"
-	depends on HID && SND
+	depends on USB_HID && SND
 	select SND_RAWMIDI
 	---help---
 	Support for Prodikeys PC-MIDI Keyboard device support.
@@ -524,7 +524,7 @@ config HID_LENOVO
 
 config HID_LOGITECH
 	tristate "Logitech devices"
-	depends on HID
+	depends on USB_HID
 	default !EXPERT
 	---help---
 	Support for Logitech devices that are not fully compliant with HID standard.
@@ -900,7 +900,7 @@ config HID_SAITEK
 
 config HID_SAMSUNG
 	tristate "Samsung InfraRed remote control or keyboards"
-	depends on HID
+	depends on USB_HID
 	---help---
 	Support for Samsung InfraRed remote control or keyboards.
 
diff --git a/drivers/hid/hid-asus.c b/drivers/hid/hid-asus.c
index e6e4c841fb06..7f84ed0afdfe 100644
--- a/drivers/hid/hid-asus.c
+++ b/drivers/hid/hid-asus.c
@@ -849,7 +849,7 @@ static int asus_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	if (drvdata->quirks & QUIRK_IS_MULTITOUCH)
 		drvdata->tp = &asus_i2c_tp;
 
-	if (drvdata->quirks & QUIRK_T100_KEYBOARD) {
+	if ((drvdata->quirks & QUIRK_T100_KEYBOARD) && hid_is_usb(hdev)) {
 		struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 
 		if (intf->altsetting->desc.bInterfaceNumber == T100_TPAD_INTF) {
diff --git a/drivers/hid/hid-bigbenff.c b/drivers/hid/hid-bigbenff.c
index db6da21ade06..74ad8bf98bfd 100644
--- a/drivers/hid/hid-bigbenff.c
+++ b/drivers/hid/hid-bigbenff.c
@@ -191,7 +191,7 @@ static void bigben_worker(struct work_struct *work)
 		struct bigben_device, worker);
 	struct hid_field *report_field = bigben->report->field[0];
 
-	if (bigben->removed)
+	if (bigben->removed || !report_field)
 		return;
 
 	if (bigben->work_led) {
diff --git a/drivers/hid/hid-chicony.c b/drivers/hid/hid-chicony.c
index 3f0ed6a95223..e19e2b597339 100644
--- a/drivers/hid/hid-chicony.c
+++ b/drivers/hid/hid-chicony.c
@@ -58,8 +58,12 @@ static int ch_input_mapping(struct hid_device *hdev, struct hid_input *hi,
 static __u8 *ch_switch12_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 		unsigned int *rsize)
 {
-	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
-	
+	struct usb_interface *intf;
+
+	if (!hid_is_usb(hdev))
+		return rdesc;
+
+	intf = to_usb_interface(hdev->dev.parent);
 	if (intf->cur_altsetting->desc.bInterfaceNumber == 1) {
 		/* Change usage maximum and logical maximum from 0x7fff to
 		 * 0x2fff, so they don't exceed HID_MAX_USAGES */
diff --git a/drivers/hid/hid-corsair.c b/drivers/hid/hid-corsair.c
index 902a60e249ed..8c895c820b67 100644
--- a/drivers/hid/hid-corsair.c
+++ b/drivers/hid/hid-corsair.c
@@ -553,7 +553,12 @@ static int corsair_probe(struct hid_device *dev, const struct hid_device_id *id)
 	int ret;
 	unsigned long quirks = id->driver_data;
 	struct corsair_drvdata *drvdata;
-	struct usb_interface *usbif = to_usb_interface(dev->dev.parent);
+	struct usb_interface *usbif;
+
+	if (!hid_is_usb(dev))
+		return -EINVAL;
+
+	usbif = to_usb_interface(dev->dev.parent);
 
 	drvdata = devm_kzalloc(&dev->dev, sizeof(struct corsair_drvdata),
 			       GFP_KERNEL);
diff --git a/drivers/hid/hid-elan.c b/drivers/hid/hid-elan.c
index dae193749d44..0e8f424025fe 100644
--- a/drivers/hid/hid-elan.c
+++ b/drivers/hid/hid-elan.c
@@ -50,7 +50,7 @@ struct elan_drvdata {
 
 static int is_not_elan_touchpad(struct hid_device *hdev)
 {
-	if (hdev->bus == BUS_USB) {
+	if (hid_is_usb(hdev)) {
 		struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
 
 		return (intf->altsetting->desc.bInterfaceNumber !=
diff --git a/drivers/hid/hid-elo.c b/drivers/hid/hid-elo.c
index 0d22713a3874..2876cb6a7dca 100644
--- a/drivers/hid/hid-elo.c
+++ b/drivers/hid/hid-elo.c
@@ -229,6 +229,9 @@ static int elo_probe(struct hid_device *hdev, const struct hid_device_id *id)
 	struct elo_priv *priv;
 	int ret;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
diff --git a/drivers/hid/hid-holtek-kbd.c b/drivers/hid/hid-holtek-kbd.c
index 0a38e8e9bc78..403506b9697e 100644
--- a/drivers/hid/hid-holtek-kbd.c
+++ b/drivers/hid/hid-holtek-kbd.c
@@ -140,12 +140,17 @@ static int holtek_kbd_input_event(struct input_dev *dev, unsigned int type,
 static int holtek_kbd_probe(struct hid_device *hdev,
 		const struct hid_device_id *id)
 {
-	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
-	int ret = hid_parse(hdev);
+	struct usb_interface *intf;
+	int ret;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
+	ret = hid_parse(hdev);
 	if (!ret)
 		ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 
+	intf = to_usb_interface(hdev->dev.parent);
 	if (!ret && intf->cur_altsetting->desc.bInterfaceNumber == 1) {
 		struct hid_input *hidinput;
 		list_for_each_entry(hidinput, &hdev->inputs, list) {
diff --git a/drivers/hid/hid-holtek-mouse.c b/drivers/hid/hid-holtek-mouse.c
index 195b735b001d..b7172c48ef9f 100644
--- a/drivers/hid/hid-holtek-mouse.c
+++ b/drivers/hid/hid-holtek-mouse.c
@@ -62,6 +62,14 @@ static __u8 *holtek_mouse_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 	return rdesc;
 }
 
+static int holtek_mouse_probe(struct hid_device *hdev,
+			      const struct hid_device_id *id)
+{
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+	return 0;
+}
+
 static const struct hid_device_id holtek_mouse_devices[] = {
 	{ HID_USB_DEVICE(USB_VENDOR_ID_HOLTEK_ALT,
 			USB_DEVICE_ID_HOLTEK_ALT_MOUSE_A067) },
@@ -83,6 +91,7 @@ static struct hid_driver holtek_mouse_driver = {
 	.name = "holtek_mouse",
 	.id_table = holtek_mouse_devices,
 	.report_fixup = holtek_mouse_report_fixup,
+	.probe = holtek_mouse_probe,
 };
 
 module_hid_driver(holtek_mouse_driver);
diff --git a/drivers/hid/hid-lg.c b/drivers/hid/hid-lg.c
index 0dc7cdfc56f7..2c7e7c089bf9 100644
--- a/drivers/hid/hid-lg.c
+++ b/drivers/hid/hid-lg.c
@@ -769,12 +769,18 @@ static int lg_raw_event(struct hid_device *hdev, struct hid_report *report,
 
 static int lg_probe(struct hid_device *hdev, const struct hid_device_id *id)
 {
-	struct usb_interface *iface = to_usb_interface(hdev->dev.parent);
-	__u8 iface_num = iface->cur_altsetting->desc.bInterfaceNumber;
+	struct usb_interface *iface;
+	__u8 iface_num;
 	unsigned int connect_mask = HID_CONNECT_DEFAULT;
 	struct lg_drv_data *drv_data;
 	int ret;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
+	iface = to_usb_interface(hdev->dev.parent);
+	iface_num = iface->cur_altsetting->desc.bInterfaceNumber;
+
 	/* G29 only work with the 1st interface */
 	if ((hdev->product == USB_DEVICE_ID_LOGITECH_G29_WHEEL) &&
 	    (iface_num != 0)) {
diff --git a/drivers/hid/hid-logitech-dj.c b/drivers/hid/hid-logitech-dj.c
index b499ac37dc7b..4267e2f2e70f 100644
--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -1686,7 +1686,7 @@ static int logi_dj_probe(struct hid_device *hdev,
 	case recvr_type_27mhz:		no_dj_interfaces = 2; break;
 	case recvr_type_bluetooth:	no_dj_interfaces = 2; break;
 	}
-	if (hid_is_using_ll_driver(hdev, &usb_hid_driver)) {
+	if (hid_is_usb(hdev)) {
 		intf = to_usb_interface(hdev->dev.parent);
 		if (intf && intf->altsetting->desc.bInterfaceNumber >=
 							no_dj_interfaces) {
diff --git a/drivers/hid/hid-prodikeys.c b/drivers/hid/hid-prodikeys.c
index 2666af02d5c1..e4e9471d0f1e 100644
--- a/drivers/hid/hid-prodikeys.c
+++ b/drivers/hid/hid-prodikeys.c
@@ -798,12 +798,18 @@ static int pk_raw_event(struct hid_device *hdev, struct hid_report *report,
 static int pk_probe(struct hid_device *hdev, const struct hid_device_id *id)
 {
 	int ret;
-	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
-	unsigned short ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
+	struct usb_interface *intf;
+	unsigned short ifnum;
 	unsigned long quirks = id->driver_data;
 	struct pk_device *pk;
 	struct pcmidi_snd *pm = NULL;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
+	intf = to_usb_interface(hdev->dev.parent);
+	ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
+
 	pk = kzalloc(sizeof(*pk), GFP_KERNEL);
 	if (pk == NULL) {
 		hid_err(hdev, "can't alloc descriptor\n");
diff --git a/drivers/hid/hid-roccat-arvo.c b/drivers/hid/hid-roccat-arvo.c
index ffcd444ae2ba..4b18e1a4fc7a 100644
--- a/drivers/hid/hid-roccat-arvo.c
+++ b/drivers/hid/hid-roccat-arvo.c
@@ -344,6 +344,9 @@ static int arvo_probe(struct hid_device *hdev,
 {
 	int retval;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	retval = hid_parse(hdev);
 	if (retval) {
 		hid_err(hdev, "parse failed\n");
diff --git a/drivers/hid/hid-roccat-isku.c b/drivers/hid/hid-roccat-isku.c
index ce5f22519956..e95d59cd8d07 100644
--- a/drivers/hid/hid-roccat-isku.c
+++ b/drivers/hid/hid-roccat-isku.c
@@ -324,6 +324,9 @@ static int isku_probe(struct hid_device *hdev,
 {
 	int retval;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	retval = hid_parse(hdev);
 	if (retval) {
 		hid_err(hdev, "parse failed\n");
diff --git a/drivers/hid/hid-roccat-kone.c b/drivers/hid/hid-roccat-kone.c
index 509b9bb1362c..6cf59b5e5484 100644
--- a/drivers/hid/hid-roccat-kone.c
+++ b/drivers/hid/hid-roccat-kone.c
@@ -749,6 +749,9 @@ static int kone_probe(struct hid_device *hdev, const struct hid_device_id *id)
 {
 	int retval;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	retval = hid_parse(hdev);
 	if (retval) {
 		hid_err(hdev, "parse failed\n");
diff --git a/drivers/hid/hid-roccat-koneplus.c b/drivers/hid/hid-roccat-koneplus.c
index 0316edf8c5bb..1896c69ea512 100644
--- a/drivers/hid/hid-roccat-koneplus.c
+++ b/drivers/hid/hid-roccat-koneplus.c
@@ -431,6 +431,9 @@ static int koneplus_probe(struct hid_device *hdev,
 {
 	int retval;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	retval = hid_parse(hdev);
 	if (retval) {
 		hid_err(hdev, "parse failed\n");
diff --git a/drivers/hid/hid-roccat-konepure.c b/drivers/hid/hid-roccat-konepure.c
index 5248b3c7cf78..cf8eeb33a125 100644
--- a/drivers/hid/hid-roccat-konepure.c
+++ b/drivers/hid/hid-roccat-konepure.c
@@ -133,6 +133,9 @@ static int konepure_probe(struct hid_device *hdev,
 {
 	int retval;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	retval = hid_parse(hdev);
 	if (retval) {
 		hid_err(hdev, "parse failed\n");
diff --git a/drivers/hid/hid-roccat-kovaplus.c b/drivers/hid/hid-roccat-kovaplus.c
index 960012881570..6fb9b9563769 100644
--- a/drivers/hid/hid-roccat-kovaplus.c
+++ b/drivers/hid/hid-roccat-kovaplus.c
@@ -501,6 +501,9 @@ static int kovaplus_probe(struct hid_device *hdev,
 {
 	int retval;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	retval = hid_parse(hdev);
 	if (retval) {
 		hid_err(hdev, "parse failed\n");
diff --git a/drivers/hid/hid-roccat-lua.c b/drivers/hid/hid-roccat-lua.c
index 4a88a76d5c62..d5ddf0d68346 100644
--- a/drivers/hid/hid-roccat-lua.c
+++ b/drivers/hid/hid-roccat-lua.c
@@ -160,6 +160,9 @@ static int lua_probe(struct hid_device *hdev,
 {
 	int retval;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	retval = hid_parse(hdev);
 	if (retval) {
 		hid_err(hdev, "parse failed\n");
diff --git a/drivers/hid/hid-roccat-pyra.c b/drivers/hid/hid-roccat-pyra.c
index 989927defe8d..4fcc8e7d276f 100644
--- a/drivers/hid/hid-roccat-pyra.c
+++ b/drivers/hid/hid-roccat-pyra.c
@@ -449,6 +449,9 @@ static int pyra_probe(struct hid_device *hdev, const struct hid_device_id *id)
 {
 	int retval;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	retval = hid_parse(hdev);
 	if (retval) {
 		hid_err(hdev, "parse failed\n");
diff --git a/drivers/hid/hid-roccat-ryos.c b/drivers/hid/hid-roccat-ryos.c
index 3956a6c9c521..5bf1971a2b14 100644
--- a/drivers/hid/hid-roccat-ryos.c
+++ b/drivers/hid/hid-roccat-ryos.c
@@ -141,6 +141,9 @@ static int ryos_probe(struct hid_device *hdev,
 {
 	int retval;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	retval = hid_parse(hdev);
 	if (retval) {
 		hid_err(hdev, "parse failed\n");
diff --git a/drivers/hid/hid-roccat-savu.c b/drivers/hid/hid-roccat-savu.c
index 818701f7a028..a784bb4ee651 100644
--- a/drivers/hid/hid-roccat-savu.c
+++ b/drivers/hid/hid-roccat-savu.c
@@ -113,6 +113,9 @@ static int savu_probe(struct hid_device *hdev,
 {
 	int retval;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	retval = hid_parse(hdev);
 	if (retval) {
 		hid_err(hdev, "parse failed\n");
diff --git a/drivers/hid/hid-samsung.c b/drivers/hid/hid-samsung.c
index 2e1c31156eca..cf5992e97094 100644
--- a/drivers/hid/hid-samsung.c
+++ b/drivers/hid/hid-samsung.c
@@ -152,6 +152,9 @@ static int samsung_probe(struct hid_device *hdev,
 	int ret;
 	unsigned int cmask = HID_CONNECT_DEFAULT;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	ret = hid_parse(hdev);
 	if (ret) {
 		hid_err(hdev, "parse failed\n");
diff --git a/drivers/hid/hid-u2fzero.c b/drivers/hid/hid-u2fzero.c
index 95e0807878c7..6f107e35d8a4 100644
--- a/drivers/hid/hid-u2fzero.c
+++ b/drivers/hid/hid-u2fzero.c
@@ -286,7 +286,7 @@ static int u2fzero_probe(struct hid_device *hdev,
 	unsigned int minor;
 	int ret;
 
-	if (!hid_is_using_ll_driver(hdev, &usb_hid_driver))
+	if (!hid_is_usb(hdev))
 		return -EINVAL;
 
 	dev = devm_kzalloc(&hdev->dev, sizeof(*dev), GFP_KERNEL);
diff --git a/drivers/hid/hid-uclogic-core.c b/drivers/hid/hid-uclogic-core.c
index 8e9c9e646cb7..4edb24195704 100644
--- a/drivers/hid/hid-uclogic-core.c
+++ b/drivers/hid/hid-uclogic-core.c
@@ -164,6 +164,9 @@ static int uclogic_probe(struct hid_device *hdev,
 	struct uclogic_drvdata *drvdata = NULL;
 	bool params_initialized = false;
 
+	if (!hid_is_usb(hdev))
+		return -EINVAL;
+
 	/*
 	 * libinput requires the pad interface to be on a different node
 	 * than the pen, so use QUIRK_MULTI_INPUT for all tablets.
diff --git a/drivers/hid/hid-uclogic-params.c b/drivers/hid/hid-uclogic-params.c
index e80c812f44a7..ed4ede52b017 100644
--- a/drivers/hid/hid-uclogic-params.c
+++ b/drivers/hid/hid-uclogic-params.c
@@ -841,8 +841,7 @@ int uclogic_params_init(struct uclogic_params *params,
 	struct uclogic_params p = {0, };
 
 	/* Check arguments */
-	if (params == NULL || hdev == NULL ||
-	    !hid_is_using_ll_driver(hdev, &usb_hid_driver)) {
+	if (params == NULL || hdev == NULL || !hid_is_usb(hdev)) {
 		rc = -EINVAL;
 		goto cleanup;
 	}
diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index 73dafa60080f..329bb1a46f90 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -726,7 +726,7 @@ static void wacom_retrieve_hid_descriptor(struct hid_device *hdev,
 	 * Skip the query for this type and modify defaults based on
 	 * interface number.
 	 */
-	if (features->type == WIRELESS) {
+	if (features->type == WIRELESS && intf) {
 		if (intf->cur_altsetting->desc.bInterfaceNumber == 0)
 			features->device_type = WACOM_DEVICETYPE_WL_MONITOR;
 		else
@@ -2217,7 +2217,7 @@ static void wacom_update_name(struct wacom *wacom, const char *suffix)
 	if ((features->type == HID_GENERIC) && !strcmp("Wacom HID", features->name)) {
 		char *product_name = wacom->hdev->name;
 
-		if (hid_is_using_ll_driver(wacom->hdev, &usb_hid_driver)) {
+		if (hid_is_usb(wacom->hdev)) {
 			struct usb_interface *intf = to_usb_interface(wacom->hdev->dev.parent);
 			struct usb_device *dev = interface_to_usbdev(intf);
 			product_name = dev->product;
@@ -2448,6 +2448,9 @@ static void wacom_wireless_work(struct work_struct *work)
 
 	wacom_destroy_battery(wacom);
 
+	if (!usbdev)
+		return;
+
 	/* Stylus interface */
 	hdev1 = usb_get_intfdata(usbdev->config->interface[1]);
 	wacom1 = hid_get_drvdata(hdev1);
@@ -2727,8 +2730,6 @@ static void wacom_mode_change_work(struct work_struct *work)
 static int wacom_probe(struct hid_device *hdev,
 		const struct hid_device_id *id)
 {
-	struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
-	struct usb_device *dev = interface_to_usbdev(intf);
 	struct wacom *wacom;
 	struct wacom_wac *wacom_wac;
 	struct wacom_features *features;
@@ -2763,8 +2764,14 @@ static int wacom_probe(struct hid_device *hdev,
 	wacom_wac->hid_data.inputmode = -1;
 	wacom_wac->mode_report = -1;
 
-	wacom->usbdev = dev;
-	wacom->intf = intf;
+	if (hid_is_usb(hdev)) {
+		struct usb_interface *intf = to_usb_interface(hdev->dev.parent);
+		struct usb_device *dev = interface_to_usbdev(intf);
+
+		wacom->usbdev = dev;
+		wacom->intf = intf;
+	}
+
 	mutex_init(&wacom->lock);
 	INIT_DELAYED_WORK(&wacom->init_work, wacom_init_work);
 	INIT_WORK(&wacom->wireless_work, wacom_wireless_work);
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 82cb123f146a..fdfb46424a39 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -1696,6 +1696,18 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 	struct usb_function		*f = NULL;
 	u8				endp;
 
+	if (w_length > USB_COMP_EP0_BUFSIZ) {
+		if (ctrl->bRequestType & USB_DIR_IN) {
+			/* Cast away the const, we are going to overwrite on purpose. */
+			__le16 *temp = (__le16 *)&ctrl->wLength;
+
+			*temp = cpu_to_le16(USB_COMP_EP0_BUFSIZ);
+			w_length = USB_COMP_EP0_BUFSIZ;
+		} else {
+			goto done;
+		}
+	}
+
 	/* partial re-init of the response message; the function or the
 	 * gadget might need to intercept e.g. a control-OUT completion
 	 * when we delegate to it.
@@ -2229,7 +2241,7 @@ int composite_dev_prepare(struct usb_composite_driver *composite,
 	if (!cdev->req)
 		return -ENOMEM;
 
-	cdev->req->buf = kmalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
+	cdev->req->buf = kzalloc(USB_COMP_EP0_BUFSIZ, GFP_KERNEL);
 	if (!cdev->req->buf)
 		goto fail;
 
diff --git a/drivers/usb/gadget/function/f_accessory.c b/drivers/usb/gadget/function/f_accessory.c
index 0326f9fb4453..2d2ebbb41a38 100644
--- a/drivers/usb/gadget/function/f_accessory.c
+++ b/drivers/usb/gadget/function/f_accessory.c
@@ -601,8 +601,11 @@ fail:
 	pr_err("acc_bind() could not allocate requests\n");
 	while ((req = req_get(dev, &dev->tx_idle)))
 		acc_request_free(req, dev->ep_in);
-	for (i = 0; i < RX_REQ_MAX; i++)
+	for (i = 0; i < RX_REQ_MAX; i++) {
 		acc_request_free(dev->rx_req[i], dev->ep_out);
+		dev->rx_req[i] = NULL;
+	}
+
 	return -1;
 }
 
@@ -634,6 +637,12 @@ static ssize_t acc_read(struct file *fp, char __user *buf,
 		goto done;
 	}
 
+	if (!dev->rx_req[0]) {
+		pr_warn("acc_read: USB request already handled/freed");
+		r = -EINVAL;
+		goto done;
+	}
+
 	/*
 	 * Calculate the data length by considering termination character.
 	 * Then compansite the difference of rounding up to
@@ -1100,8 +1109,10 @@ acc_function_unbind(struct usb_configuration *c, struct usb_function *f)
 
 	while ((req = req_get(dev, &dev->tx_idle)))
 		acc_request_free(req, dev->ep_in);
-	for (i = 0; i < RX_REQ_MAX; i++)
+	for (i = 0; i < RX_REQ_MAX; i++) {
 		acc_request_free(dev->rx_req[i], dev->ep_out);
+		dev->rx_req[i] = NULL;
+	}
 
 	acc_hid_unbind(dev);
 }
diff --git a/drivers/usb/gadget/legacy/dbgp.c b/drivers/usb/gadget/legacy/dbgp.c
index e1d566c9918a..6bcbad382580 100644
--- a/drivers/usb/gadget/legacy/dbgp.c
+++ b/drivers/usb/gadget/legacy/dbgp.c
@@ -137,7 +137,7 @@ static int dbgp_enable_ep_req(struct usb_ep *ep)
 		goto fail_1;
 	}
 
-	req->buf = kmalloc(DBGP_REQ_LEN, GFP_KERNEL);
+	req->buf = kzalloc(DBGP_REQ_LEN, GFP_KERNEL);
 	if (!req->buf) {
 		err = -ENOMEM;
 		stp = 2;
@@ -345,6 +345,19 @@ static int dbgp_setup(struct usb_gadget *gadget,
 	void *data = NULL;
 	u16 len = 0;
 
+	if (length > DBGP_REQ_LEN) {
+		if (ctrl->bRequestType & USB_DIR_IN) {
+			/* Cast away the const, we are going to overwrite on purpose. */
+			__le16 *temp = (__le16 *)&ctrl->wLength;
+
+			*temp = cpu_to_le16(DBGP_REQ_LEN);
+			length = DBGP_REQ_LEN;
+		} else {
+			return err;
+		}
+	}
+
+
 	if (request == USB_REQ_GET_DESCRIPTOR) {
 		switch (value>>8) {
 		case USB_DT_DEVICE:
diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index cabcbb47f0ac..5f1e15172403 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -110,6 +110,8 @@ enum ep0_state {
 /* enough for the whole queue: most events invalidate others */
 #define	N_EVENT			5
 
+#define RBUF_SIZE		256
+
 struct dev_data {
 	spinlock_t			lock;
 	refcount_t			count;
@@ -144,7 +146,7 @@ struct dev_data {
 	struct dentry			*dentry;
 
 	/* except this scratch i/o buffer for ep0 */
-	u8				rbuf [256];
+	u8				rbuf[RBUF_SIZE];
 };
 
 static inline void get_dev (struct dev_data *data)
@@ -1333,6 +1335,18 @@ gadgetfs_setup (struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
 	u16				w_value = le16_to_cpu(ctrl->wValue);
 	u16				w_length = le16_to_cpu(ctrl->wLength);
 
+	if (w_length > RBUF_SIZE) {
+		if (ctrl->bRequestType & USB_DIR_IN) {
+			/* Cast away the const, we are going to overwrite on purpose. */
+			__le16 *temp = (__le16 *)&ctrl->wLength;
+
+			*temp = cpu_to_le16(RBUF_SIZE);
+			w_length = RBUF_SIZE;
+		} else {
+			return value;
+		}
+	}
+
 	spin_lock (&dev->lock);
 	dev->setup_abort = 0;
 	if (dev->state == STATE_DEV_UNCONNECTED) {
diff --git a/fs/aio.c b/fs/aio.c
index 51dd01b578c5..ab41894faf15 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -177,8 +177,9 @@ struct poll_iocb {
 	struct file		*file;
 	struct wait_queue_head	*head;
 	__poll_t		events;
-	bool			done;
 	bool			cancelled;
+	bool			work_scheduled;
+	bool			work_need_resched;
 	struct wait_queue_entry	wait;
 	struct work_struct	work;
 };
@@ -1620,6 +1621,51 @@ static void aio_poll_put_work(struct work_struct *work)
 	iocb_put(iocb);
 }
 
+/*
+ * Safely lock the waitqueue which the request is on, synchronizing with the
+ * case where the ->poll() provider decides to free its waitqueue early.
+ *
+ * Returns true on success, meaning that req->head->lock was locked, req->wait
+ * is on req->head, and an RCU read lock was taken.  Returns false if the
+ * request was already removed from its waitqueue (which might no longer exist).
+ */
+static bool poll_iocb_lock_wq(struct poll_iocb *req)
+{
+	wait_queue_head_t *head;
+
+	/*
+	 * While we hold the waitqueue lock and the waitqueue is nonempty,
+	 * wake_up_pollfree() will wait for us.  However, taking the waitqueue
+	 * lock in the first place can race with the waitqueue being freed.
+	 *
+	 * We solve this as eventpoll does: by taking advantage of the fact that
+	 * all users of wake_up_pollfree() will RCU-delay the actual free.  If
+	 * we enter rcu_read_lock() and see that the pointer to the queue is
+	 * non-NULL, we can then lock it without the memory being freed out from
+	 * under us, then check whether the request is still on the queue.
+	 *
+	 * Keep holding rcu_read_lock() as long as we hold the queue lock, in
+	 * case the caller deletes the entry from the queue, leaving it empty.
+	 * In that case, only RCU prevents the queue memory from being freed.
+	 */
+	rcu_read_lock();
+	head = smp_load_acquire(&req->head);
+	if (head) {
+		spin_lock(&head->lock);
+		if (!list_empty(&req->wait.entry))
+			return true;
+		spin_unlock(&head->lock);
+	}
+	rcu_read_unlock();
+	return false;
+}
+
+static void poll_iocb_unlock_wq(struct poll_iocb *req)
+{
+	spin_unlock(&req->head->lock);
+	rcu_read_unlock();
+}
+
 static void aio_poll_complete_work(struct work_struct *work)
 {
 	struct poll_iocb *req = container_of(work, struct poll_iocb, work);
@@ -1639,14 +1685,27 @@ static void aio_poll_complete_work(struct work_struct *work)
 	 * avoid further branches in the fast path.
 	 */
 	spin_lock_irq(&ctx->ctx_lock);
-	if (!mask && !READ_ONCE(req->cancelled)) {
-		add_wait_queue(req->head, &req->wait);
-		spin_unlock_irq(&ctx->ctx_lock);
-		return;
-	}
+	if (poll_iocb_lock_wq(req)) {
+		if (!mask && !READ_ONCE(req->cancelled)) {
+			/*
+			 * The request isn't actually ready to be completed yet.
+			 * Reschedule completion if another wakeup came in.
+			 */
+			if (req->work_need_resched) {
+				schedule_work(&req->work);
+				req->work_need_resched = false;
+			} else {
+				req->work_scheduled = false;
+			}
+			poll_iocb_unlock_wq(req);
+			spin_unlock_irq(&ctx->ctx_lock);
+			return;
+		}
+		list_del_init(&req->wait.entry);
+		poll_iocb_unlock_wq(req);
+	} /* else, POLLFREE has freed the waitqueue, so we must complete */
 	list_del_init(&iocb->ki_list);
 	iocb->ki_res.res = mangle_poll(mask);
-	req->done = true;
 	spin_unlock_irq(&ctx->ctx_lock);
 
 	iocb_put(iocb);
@@ -1658,13 +1717,14 @@ static int aio_poll_cancel(struct kiocb *iocb)
 	struct aio_kiocb *aiocb = container_of(iocb, struct aio_kiocb, rw);
 	struct poll_iocb *req = &aiocb->poll;
 
-	spin_lock(&req->head->lock);
-	WRITE_ONCE(req->cancelled, true);
-	if (!list_empty(&req->wait.entry)) {
-		list_del_init(&req->wait.entry);
-		schedule_work(&aiocb->poll.work);
-	}
-	spin_unlock(&req->head->lock);
+	if (poll_iocb_lock_wq(req)) {
+		WRITE_ONCE(req->cancelled, true);
+		if (!req->work_scheduled) {
+			schedule_work(&aiocb->poll.work);
+			req->work_scheduled = true;
+		}
+		poll_iocb_unlock_wq(req);
+	} /* else, the request was force-cancelled by POLLFREE already */
 
 	return 0;
 }
@@ -1681,20 +1741,26 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
 	if (mask && !(mask & req->events))
 		return 0;
 
-	list_del_init(&req->wait.entry);
-
-	if (mask && spin_trylock_irqsave(&iocb->ki_ctx->ctx_lock, flags)) {
+	/*
+	 * Complete the request inline if possible.  This requires that three
+	 * conditions be met:
+	 *   1. An event mask must have been passed.  If a plain wakeup was done
+	 *	instead, then mask == 0 and we have to call vfs_poll() to get
+	 *	the events, so inline completion isn't possible.
+	 *   2. The completion work must not have already been scheduled.
+	 *   3. ctx_lock must not be busy.  We have to use trylock because we
+	 *	already hold the waitqueue lock, so this inverts the normal
+	 *	locking order.  Use irqsave/irqrestore because not all
+	 *	filesystems (e.g. fuse) call this function with IRQs disabled,
+	 *	yet IRQs have to be disabled before ctx_lock is obtained.
+	 */
+	if (mask && !req->work_scheduled &&
+	    spin_trylock_irqsave(&iocb->ki_ctx->ctx_lock, flags)) {
 		struct kioctx *ctx = iocb->ki_ctx;
 
-		/*
-		 * Try to complete the iocb inline if we can. Use
-		 * irqsave/irqrestore because not all filesystems (e.g. fuse)
-		 * call this function with IRQs disabled and because IRQs
-		 * have to be disabled before ctx_lock is obtained.
-		 */
+		list_del_init(&req->wait.entry);
 		list_del(&iocb->ki_list);
 		iocb->ki_res.res = mangle_poll(mask);
-		req->done = true;
 		if (iocb->ki_eventfd && eventfd_signal_count()) {
 			iocb = NULL;
 			INIT_WORK(&req->work, aio_poll_put_work);
@@ -1704,7 +1770,43 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
 		if (iocb)
 			iocb_put(iocb);
 	} else {
-		schedule_work(&req->work);
+		/*
+		 * Schedule the completion work if needed.  If it was already
+		 * scheduled, record that another wakeup came in.
+		 *
+		 * Don't remove the request from the waitqueue here, as it might
+		 * not actually be complete yet (we won't know until vfs_poll()
+		 * is called), and we must not miss any wakeups.  POLLFREE is an
+		 * exception to this; see below.
+		 */
+		if (req->work_scheduled) {
+			req->work_need_resched = true;
+		} else {
+			schedule_work(&req->work);
+			req->work_scheduled = true;
+		}
+
+		/*
+		 * If the waitqueue is being freed early but we can't complete
+		 * the request inline, we have to tear down the request as best
+		 * we can.  That means immediately removing the request from its
+		 * waitqueue and preventing all further accesses to the
+		 * waitqueue via the request.  We also need to schedule the
+		 * completion work (done above).  Also mark the request as
+		 * cancelled, to potentially skip an unneeded call to ->poll().
+		 */
+		if (mask & POLLFREE) {
+			WRITE_ONCE(req->cancelled, true);
+			list_del_init(&req->wait.entry);
+
+			/*
+			 * Careful: this *must* be the last step, since as soon
+			 * as req->head is NULL'ed out, the request can be
+			 * completed and freed, since aio_poll_complete_work()
+			 * will no longer need to take the waitqueue lock.
+			 */
+			smp_store_release(&req->head, NULL);
+		}
 	}
 	return 1;
 }
@@ -1712,6 +1814,7 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
 struct aio_poll_table {
 	struct poll_table_struct	pt;
 	struct aio_kiocb		*iocb;
+	bool				queued;
 	int				error;
 };
 
@@ -1722,11 +1825,12 @@ aio_poll_queue_proc(struct file *file, struct wait_queue_head *head,
 	struct aio_poll_table *pt = container_of(p, struct aio_poll_table, pt);
 
 	/* multiple wait queues per file are not supported */
-	if (unlikely(pt->iocb->poll.head)) {
+	if (unlikely(pt->queued)) {
 		pt->error = -EINVAL;
 		return;
 	}
 
+	pt->queued = true;
 	pt->error = 0;
 	pt->iocb->poll.head = head;
 	add_wait_queue(head, &pt->iocb->poll.wait);
@@ -1751,12 +1855,14 @@ static int aio_poll(struct aio_kiocb *aiocb, const struct iocb *iocb)
 	req->events = demangle_poll(iocb->aio_buf) | EPOLLERR | EPOLLHUP;
 
 	req->head = NULL;
-	req->done = false;
 	req->cancelled = false;
+	req->work_scheduled = false;
+	req->work_need_resched = false;
 
 	apt.pt._qproc = aio_poll_queue_proc;
 	apt.pt._key = req->events;
 	apt.iocb = aiocb;
+	apt.queued = false;
 	apt.error = -EINVAL; /* same as no support for IOCB_CMD_POLL */
 
 	/* initialized the list so that we can do list_empty checks */
@@ -1765,23 +1871,35 @@ static int aio_poll(struct aio_kiocb *aiocb, const struct iocb *iocb)
 
 	mask = vfs_poll(req->file, &apt.pt) & req->events;
 	spin_lock_irq(&ctx->ctx_lock);
-	if (likely(req->head)) {
-		spin_lock(&req->head->lock);
-		if (unlikely(list_empty(&req->wait.entry))) {
-			if (apt.error)
+	if (likely(apt.queued)) {
+		bool on_queue = poll_iocb_lock_wq(req);
+
+		if (!on_queue || req->work_scheduled) {
+			/*
+			 * aio_poll_wake() already either scheduled the async
+			 * completion work, or completed the request inline.
+			 */
+			if (apt.error) /* unsupported case: multiple queues */
 				cancel = true;
 			apt.error = 0;
 			mask = 0;
 		}
 		if (mask || apt.error) {
+			/* Steal to complete synchronously. */
 			list_del_init(&req->wait.entry);
 		} else if (cancel) {
+			/* Cancel if possible (may be too late though). */
 			WRITE_ONCE(req->cancelled, true);
-		} else if (!req->done) { /* actually waiting for an event */
+		} else if (on_queue) {
+			/*
+			 * Actually waiting for an event, so add the request to
+			 * active_reqs so that it can be cancelled if needed.
+			 */
 			list_add_tail(&aiocb->ki_list, &ctx->active_reqs);
 			aiocb->ki_cancel = aio_poll_cancel;
 		}
-		spin_unlock(&req->head->lock);
+		if (on_queue)
+			poll_iocb_unlock_wq(req);
 	}
 	if (mask) { /* no async, we'd stolen it */
 		aiocb->ki_res.res = mangle_poll(mask);
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index f776e13c0852..607f4d13bb85 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -168,6 +168,7 @@ struct f2fs_mount_info {
 #define F2FS_FEATURE_SB_CHKSUM		0x0800
 #define F2FS_FEATURE_CASEFOLD		0x1000
 #define F2FS_FEATURE_COMPRESSION	0x2000
+#define F2FS_FEATURE_RO			0x4000
 
 #define __F2FS_HAS_FEATURE(raw_super, mask)				\
 	((raw_super->feature & cpu_to_le32(mask)) != 0)
@@ -991,6 +992,7 @@ static inline void set_new_dnode(struct dnode_of_data *dn, struct inode *inode,
  */
 #define	NR_CURSEG_DATA_TYPE	(3)
 #define NR_CURSEG_NODE_TYPE	(3)
+#define NR_CURSEG_RO_TYPE	(2)
 #define NR_CURSEG_TYPE	(NR_CURSEG_DATA_TYPE + NR_CURSEG_NODE_TYPE)
 
 enum {
@@ -3968,6 +3970,7 @@ F2FS_FEATURE_FUNCS(verity, VERITY);
 F2FS_FEATURE_FUNCS(sb_chksum, SB_CHKSUM);
 F2FS_FEATURE_FUNCS(casefold, CASEFOLD);
 F2FS_FEATURE_FUNCS(compression, COMPRESSION);
+F2FS_FEATURE_FUNCS(readonly, RO);
 
 #ifdef CONFIG_BLK_DEV_ZONED
 static inline bool f2fs_blkz_is_seq(struct f2fs_sb_info *sbi, int devi,
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index d796992f40a5..57a9d894beb6 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -68,6 +68,10 @@ static vm_fault_t f2fs_vm_page_mkwrite(struct vm_fault *vmf)
 		goto err;
 	}
 
+	err = f2fs_convert_inline_inode(inode);
+	if (err)
+		goto err;
+
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 	if (f2fs_compressed_file(inode)) {
 		int ret = f2fs_is_compressed_cluster(inode, page->index);
@@ -515,7 +519,6 @@ static loff_t f2fs_llseek(struct file *file, loff_t offset, int whence)
 static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	struct inode *inode = file_inode(file);
-	int err;
 
 	if (unlikely(f2fs_cp_error(F2FS_I_SB(inode))))
 		return -EIO;
@@ -523,11 +526,6 @@ static int f2fs_file_mmap(struct file *file, struct vm_area_struct *vma)
 	if (!f2fs_is_compress_backend_ready(inode))
 		return -EOPNOTSUPP;
 
-	/* we don't need to use inline_data strictly */
-	err = f2fs_convert_inline_inode(inode);
-	if (err)
-		return err;
-
 	file_accessed(file);
 	vma->vm_ops = &f2fs_file_vm_ops;
 	set_inode_flag(inode, FI_MMAP_FILE);
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index d433b893eb5c..bfbb1ae368b2 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -4373,6 +4373,10 @@ static int sanity_check_curseg(struct f2fs_sb_info *sbi)
 		struct seg_entry *se = get_seg_entry(sbi, curseg->segno);
 		unsigned int blkofs = curseg->next_blkoff;
 
+		if (f2fs_sb_has_readonly(sbi) &&
+			i != CURSEG_HOT_DATA && i != CURSEG_HOT_NODE)
+			continue;
+
 		if (f2fs_test_bit(blkofs, se->cur_valid_map))
 			goto out;
 
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 218487dd9f02..084d37b21c29 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -16,6 +16,7 @@
 #define DEF_MAX_RECLAIM_PREFREE_SEGMENTS	4096	/* 8GB in maximum */
 
 #define F2FS_MIN_SEGMENTS	9 /* SB + 2 (CP + SIT + NAT) + SSA + MAIN */
+#define F2FS_MIN_META_SEGMENTS	8 /* SB + 2 (CP + SIT + NAT) + SSA */
 
 /* L: Logical segment # in volume, R: Relative segment # in main area */
 #define GET_L2R_SEGNO(free_i, segno)	((segno) - (free_i)->start_segno)
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 8dd7bc4a4a0f..46480a7a2a53 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -469,7 +469,7 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 	int ret;
 
 	if (!options)
-		return 0;
+		goto default_check;
 
 	while ((p = strsep(&options, ",")) != NULL) {
 		int token;
@@ -932,6 +932,7 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 			return -EINVAL;
 		}
 	}
+default_check:
 #ifdef CONFIG_QUOTA
 	if (f2fs_check_quota_options(sbi))
 		return -EINVAL;
@@ -993,6 +994,11 @@ static int parse_options(struct super_block *sb, char *options, bool is_remount)
 	 */
 	if (F2FS_OPTION(sbi).active_logs != NR_CURSEG_TYPE)
 		F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
+
+	if (f2fs_sb_has_readonly(sbi) && !f2fs_readonly(sbi->sb)) {
+		f2fs_err(sbi, "Allow to mount readonly mode only");
+		return -EROFS;
+	}
 	return 0;
 }
 
@@ -1629,7 +1635,11 @@ static int f2fs_show_options(struct seq_file *seq, struct dentry *root)
 static void default_options(struct f2fs_sb_info *sbi)
 {
 	/* init some FS parameters */
-	F2FS_OPTION(sbi).active_logs = NR_CURSEG_TYPE;
+	if (f2fs_sb_has_readonly(sbi))
+		F2FS_OPTION(sbi).active_logs = NR_CURSEG_RO_TYPE;
+	else
+		F2FS_OPTION(sbi).active_logs = NR_CURSEG_TYPE;
+
 	F2FS_OPTION(sbi).inline_xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
 	F2FS_OPTION(sbi).whint_mode = WHINT_MODE_OFF;
 	F2FS_OPTION(sbi).alloc_mode = ALLOC_MODE_DEFAULT;
@@ -1808,6 +1818,11 @@ static int f2fs_remount(struct super_block *sb, int *flags, char *data)
 	if (f2fs_readonly(sb) && (*flags & SB_RDONLY))
 		goto skip;
 
+	if (f2fs_sb_has_readonly(sbi) && !(*flags & SB_RDONLY)) {
+		err = -EROFS;
+		goto restore_opts;
+	}
+
 #ifdef CONFIG_QUOTA
 	if (!f2fs_readonly(sb) && (*flags & SB_RDONLY)) {
 		err = dquot_suspend(sb, -1);
@@ -2711,7 +2726,7 @@ static inline bool sanity_check_area_boundary(struct f2fs_sb_info *sbi,
 static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
 				struct buffer_head *bh)
 {
-	block_t segment_count, segs_per_sec, secs_per_zone;
+	block_t segment_count, segs_per_sec, secs_per_zone, segment_count_main;
 	block_t total_sections, blocks_per_seg;
 	struct f2fs_super_block *raw_super = (struct f2fs_super_block *)
 					(bh->b_data + F2FS_SUPER_OFFSET);
@@ -2781,6 +2796,7 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
 	}
 
 	segment_count = le32_to_cpu(raw_super->segment_count);
+	segment_count_main = le32_to_cpu(raw_super->segment_count_main);
 	segs_per_sec = le32_to_cpu(raw_super->segs_per_sec);
 	secs_per_zone = le32_to_cpu(raw_super->secs_per_zone);
 	total_sections = le32_to_cpu(raw_super->section_count);
@@ -2794,8 +2810,7 @@ static int sanity_check_raw_super(struct f2fs_sb_info *sbi,
 		return -EFSCORRUPTED;
 	}
 
-	if (total_sections > segment_count ||
-			total_sections < F2FS_MIN_SEGMENTS ||
+	if (total_sections > segment_count_main || total_sections < 1 ||
 			segs_per_sec > segment_count || !segs_per_sec) {
 		f2fs_info(sbi, "Invalid segment/section count (%u, %u x %u)",
 			  segment_count, total_sections, segs_per_sec);
@@ -2902,14 +2917,15 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
 	ovp_segments = le32_to_cpu(ckpt->overprov_segment_count);
 	reserved_segments = le32_to_cpu(ckpt->rsvd_segment_count);
 
-	if (unlikely(fsmeta < F2FS_MIN_SEGMENTS ||
+	if (!f2fs_sb_has_readonly(sbi) &&
+			unlikely(fsmeta < F2FS_MIN_META_SEGMENTS ||
 			ovp_segments == 0 || reserved_segments == 0)) {
 		f2fs_err(sbi, "Wrong layout: check mkfs.f2fs version");
 		return 1;
 	}
-
 	user_block_count = le64_to_cpu(ckpt->user_block_count);
-	segment_count_main = le32_to_cpu(raw_super->segment_count_main);
+	segment_count_main = le32_to_cpu(raw_super->segment_count_main) +
+			(f2fs_sb_has_readonly(sbi) ? 1 : 0);
 	log_blocks_per_seg = le32_to_cpu(raw_super->log_blocks_per_seg);
 	if (!user_block_count || user_block_count >=
 			segment_count_main << log_blocks_per_seg) {
@@ -2940,6 +2956,10 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
 		if (le32_to_cpu(ckpt->cur_node_segno[i]) >= main_segs ||
 			le16_to_cpu(ckpt->cur_node_blkoff[i]) >= blocks_per_seg)
 			return 1;
+
+		if (f2fs_sb_has_readonly(sbi))
+			goto check_data;
+
 		for (j = i + 1; j < NR_CURSEG_NODE_TYPE; j++) {
 			if (le32_to_cpu(ckpt->cur_node_segno[i]) ==
 				le32_to_cpu(ckpt->cur_node_segno[j])) {
@@ -2950,10 +2970,15 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
 			}
 		}
 	}
+check_data:
 	for (i = 0; i < NR_CURSEG_DATA_TYPE; i++) {
 		if (le32_to_cpu(ckpt->cur_data_segno[i]) >= main_segs ||
 			le16_to_cpu(ckpt->cur_data_blkoff[i]) >= blocks_per_seg)
 			return 1;
+
+		if (f2fs_sb_has_readonly(sbi))
+			goto skip_cross;
+
 		for (j = i + 1; j < NR_CURSEG_DATA_TYPE; j++) {
 			if (le32_to_cpu(ckpt->cur_data_segno[i]) ==
 				le32_to_cpu(ckpt->cur_data_segno[j])) {
@@ -2975,7 +3000,7 @@ int f2fs_sanity_check_ckpt(struct f2fs_sb_info *sbi)
 			}
 		}
 	}
-
+skip_cross:
 	sit_bitmap_size = le32_to_cpu(ckpt->sit_ver_bitmap_bytesize);
 	nat_bitmap_size = le32_to_cpu(ckpt->nat_ver_bitmap_bytesize);
 
diff --git a/fs/f2fs/sysfs.c b/fs/f2fs/sysfs.c
index 242ed0abfe33..c420cbbd7d6d 100644
--- a/fs/f2fs/sysfs.c
+++ b/fs/f2fs/sysfs.c
@@ -145,6 +145,9 @@ static ssize_t features_show(struct f2fs_attr *a,
 	if (f2fs_sb_has_casefold(sbi))
 		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 				len ? ", " : "", "casefold");
+	if (f2fs_sb_has_readonly(sbi))
+		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
+				len ? ", " : "", "readonly");
 	if (f2fs_sb_has_compression(sbi))
 		len += scnprintf(buf + len, PAGE_SIZE - len, "%s%s",
 				len ? ", " : "", "compression");
@@ -457,6 +460,7 @@ enum feat_id {
 	FEAT_SB_CHECKSUM,
 	FEAT_CASEFOLD,
 	FEAT_COMPRESSION,
+	FEAT_RO,
 	FEAT_TEST_DUMMY_ENCRYPTION_V2,
 	FEAT_ENCRYPTED_CASEFOLD,
 };
@@ -479,6 +483,7 @@ static ssize_t f2fs_feature_show(struct f2fs_attr *a,
 	case FEAT_SB_CHECKSUM:
 	case FEAT_CASEFOLD:
 	case FEAT_COMPRESSION:
+	case FEAT_RO:
 	case FEAT_TEST_DUMMY_ENCRYPTION_V2:
 	case FEAT_ENCRYPTED_CASEFOLD:
 		return sprintf(buf, "supported\n");
@@ -604,6 +609,7 @@ F2FS_FEATURE_RO_ATTR(sb_checksum, FEAT_SB_CHECKSUM);
 #ifdef CONFIG_UNICODE
 F2FS_FEATURE_RO_ATTR(casefold, FEAT_CASEFOLD);
 #endif
+F2FS_FEATURE_RO_ATTR(readonly, FEAT_RO);
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 F2FS_FEATURE_RO_ATTR(compression, FEAT_COMPRESSION);
 #endif
@@ -697,6 +703,7 @@ static struct attribute *f2fs_feat_attrs[] = {
 #ifdef CONFIG_UNICODE
 	ATTR_LIST(casefold),
 #endif
+	ATTR_LIST(readonly),
 #ifdef CONFIG_F2FS_FS_COMPRESSION
 	ATTR_LIST(compression),
 #endif
diff --git a/fs/signalfd.c b/fs/signalfd.c
index 5b78719be445..3e94d181930f 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -35,17 +35,7 @@
 
 void signalfd_cleanup(struct sighand_struct *sighand)
 {
-	wait_queue_head_t *wqh = &sighand->signalfd_wqh;
-	/*
-	 * The lockless check can race with remove_wait_queue() in progress,
-	 * but in this case its caller should run under rcu_read_lock() and
-	 * sighand_cachep is SLAB_TYPESAFE_BY_RCU, we can safely return.
-	 */
-	if (likely(!waitqueue_active(wqh)))
-		return;
-
-	/* wait_queue_entry_t->func(POLLFREE) should do remove_wait_queue() */
-	wake_up_poll(wqh, EPOLLHUP | POLLFREE);
+	wake_up_pollfree(&sighand->signalfd_wqh);
 }
 
 struct signalfd_ctx {
diff --git a/include/linux/hid.h b/include/linux/hid.h
index 2c2b26ac11f6..bf8ec809b11d 100644
--- a/include/linux/hid.h
+++ b/include/linux/hid.h
@@ -837,6 +837,11 @@ static inline bool hid_is_using_ll_driver(struct hid_device *hdev,
 	return hdev->ll_driver == driver;
 }
 
+static inline bool hid_is_usb(struct hid_device *hdev)
+{
+	return hid_is_using_ll_driver(hdev, &usb_hid_driver);
+}
+
 #define	PM_HINT_FULLON	1<<5
 #define PM_HINT_NORMAL	1<<1
 
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 20d8cf194fb7..84bca99cf562 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1241,22 +1241,22 @@
  *
  * @binder_set_context_mgr:
  *	Check whether @mgr is allowed to be the binder context manager.
- *	@mgr contains the task_struct for the task being registered.
+ *	@mgr contains the struct cred for the current binder process.
  *	Return 0 if permission is granted.
  * @binder_transaction:
  *	Check whether @from is allowed to invoke a binder transaction call
  *	to @to.
- *	@from contains the task_struct for the sending task.
- *	@to contains the task_struct for the receiving task.
+ *	@from contains the struct cred for the sending process.
+ *	@to contains the struct cred for the receiving process.
  * @binder_transfer_binder:
  *	Check whether @from is allowed to transfer a binder reference to @to.
- *	@from contains the task_struct for the sending task.
- *	@to contains the task_struct for the receiving task.
+ *	@from contains the struct cred for the sending process.
+ *	@to contains the struct cred for the receiving process.
  * @binder_transfer_file:
  *	Check whether @from is allowed to transfer @file to @to.
- *	@from contains the task_struct for the sending task.
+ *	@from contains the struct cred for the sending process.
  *	@file contains the struct file being transferred.
- *	@to contains the task_struct for the receiving task.
+ *	@to contains the struct cred for the receiving process.
  *
  * @ptrace_access_check:
  *	Check permission before allowing the current process to trace the
@@ -1456,13 +1456,13 @@
  *     @what: kernel feature being accessed
  */
 union security_list_options {
-	int (*binder_set_context_mgr)(struct task_struct *mgr);
-	int (*binder_transaction)(struct task_struct *from,
-					struct task_struct *to);
-	int (*binder_transfer_binder)(struct task_struct *from,
-					struct task_struct *to);
-	int (*binder_transfer_file)(struct task_struct *from,
-					struct task_struct *to,
+	int (*binder_set_context_mgr)(const struct cred *mgr);
+	int (*binder_transaction)(const struct cred *from,
+					const struct cred *to);
+	int (*binder_transfer_binder)(const struct cred *from,
+					const struct cred *to);
+	int (*binder_transfer_file)(const struct cred *from,
+					const struct cred *to,
 					struct file *file);
 
 	int (*ptrace_access_check)(struct task_struct *child,
diff --git a/include/linux/security.h b/include/linux/security.h
index 269625983941..a52748661a38 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -249,13 +249,13 @@ extern int security_init(void);
 extern int early_security_init(void);
 
 /* Security operations */
-int security_binder_set_context_mgr(struct task_struct *mgr);
-int security_binder_transaction(struct task_struct *from,
-				struct task_struct *to);
-int security_binder_transfer_binder(struct task_struct *from,
-				    struct task_struct *to);
-int security_binder_transfer_file(struct task_struct *from,
-				  struct task_struct *to, struct file *file);
+int security_binder_set_context_mgr(const struct cred *mgr);
+int security_binder_transaction(const struct cred *from,
+				const struct cred *to);
+int security_binder_transfer_binder(const struct cred *from,
+				    const struct cred *to);
+int security_binder_transfer_file(const struct cred *from,
+				  const struct cred *to, struct file *file);
 int security_ptrace_access_check(struct task_struct *child, unsigned int mode);
 int security_ptrace_traceme(struct task_struct *parent);
 int security_capget(struct task_struct *target,
@@ -481,25 +481,25 @@ static inline int early_security_init(void)
 	return 0;
 }
 
-static inline int security_binder_set_context_mgr(struct task_struct *mgr)
+static inline int security_binder_set_context_mgr(const struct cred *mgr)
 {
 	return 0;
 }
 
-static inline int security_binder_transaction(struct task_struct *from,
-					      struct task_struct *to)
+static inline int security_binder_transaction(const struct cred *from,
+					      const struct cred *to)
 {
 	return 0;
 }
 
-static inline int security_binder_transfer_binder(struct task_struct *from,
-						  struct task_struct *to)
+static inline int security_binder_transfer_binder(const struct cred *from,
+						  const struct cred *to)
 {
 	return 0;
 }
 
-static inline int security_binder_transfer_file(struct task_struct *from,
-						struct task_struct *to,
+static inline int security_binder_transfer_file(const struct cred *from,
+						const struct cred *to,
 						struct file *file)
 {
 	return 0;
@@ -985,6 +985,11 @@ static inline void security_transfer_creds(struct cred *new,
 {
 }
 
+static inline void security_cred_getsecid(const struct cred *c, u32 *secid)
+{
+	*secid = 0;
+}
+
 static inline int security_kernel_act_as(struct cred *cred, u32 secid)
 {
 	return 0;
diff --git a/include/linux/wait.h b/include/linux/wait.h
index a7773c783af7..5ee4869d6df5 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -204,6 +204,7 @@ void __wake_up_locked_key_bookmark(struct wait_queue_head *wq_head,
 void __wake_up_sync_key(struct wait_queue_head *wq_head, unsigned int mode, int nr, void *key);
 void __wake_up_locked(struct wait_queue_head *wq_head, unsigned int mode, int nr);
 void __wake_up_sync(struct wait_queue_head *wq_head, unsigned int mode, int nr);
+void __wake_up_pollfree(struct wait_queue_head *wq_head);
 
 #define wake_up(x)			__wake_up(x, TASK_NORMAL, 1, NULL)
 #define wake_up_nr(x, nr)		__wake_up(x, TASK_NORMAL, nr, NULL)
@@ -231,6 +232,31 @@ void __wake_up_sync(struct wait_queue_head *wq_head, unsigned int mode, int nr);
 #define wake_up_interruptible_sync_poll(x, m)					\
 	__wake_up_sync_key((x), TASK_INTERRUPTIBLE, 1, poll_to_key(m))
 
+/**
+ * wake_up_pollfree - signal that a polled waitqueue is going away
+ * @wq_head: the wait queue head
+ *
+ * In the very rare cases where a ->poll() implementation uses a waitqueue whose
+ * lifetime is tied to a task rather than to the 'struct file' being polled,
+ * this function must be called before the waitqueue is freed so that
+ * non-blocking polls (e.g. epoll) are notified that the queue is going away.
+ *
+ * The caller must also RCU-delay the freeing of the wait_queue_head, e.g. via
+ * an explicit synchronize_rcu() or call_rcu(), or via SLAB_TYPESAFE_BY_RCU.
+ */
+static inline void wake_up_pollfree(struct wait_queue_head *wq_head)
+{
+	/*
+	 * For performance reasons, we don't always take the queue lock here.
+	 * Therefore, we might race with someone removing the last entry from
+	 * the queue, and proceed while they still hold the queue lock.
+	 * However, rcu_read_lock() is required to be held in such cases, so we
+	 * can safely proceed with an RCU-delayed free.
+	 */
+	if (waitqueue_active(wq_head))
+		__wake_up_pollfree(wq_head);
+}
+
 #define ___wait_cond_timeout(condition)						\
 ({										\
 	bool __cond = (condition);						\
diff --git a/include/uapi/asm-generic/poll.h b/include/uapi/asm-generic/poll.h
index 41b509f410bf..f9c520ce4bf4 100644
--- a/include/uapi/asm-generic/poll.h
+++ b/include/uapi/asm-generic/poll.h
@@ -29,7 +29,7 @@
 #define POLLRDHUP       0x2000
 #endif
 
-#define POLLFREE	(__force __poll_t)0x4000	/* currently only for epoll */
+#define POLLFREE	(__force __poll_t)0x4000
 
 #define POLL_BUSY_LOOP	(__force __poll_t)0x8000
 
diff --git a/include/uapi/linux/android/binder.h b/include/uapi/linux/android/binder.h
index 25d12f7ab3f1..14340b0267b7 100644
--- a/include/uapi/linux/android/binder.h
+++ b/include/uapi/linux/android/binder.h
@@ -265,6 +265,25 @@ struct binder_node_info_for_ref {
 	__u32            reserved3;
 };
 
+struct binder_freeze_info {
+	__u32            pid;
+	__u32            enable;
+	__u32            timeout_ms;
+};
+
+struct binder_frozen_status_info {
+	__u32            pid;
+
+	/* process received sync transactions since last frozen
+	 * bit 0: received sync transaction after being frozen
+	 * bit 1: new pending sync transaction during freezing
+	 */
+	__u32            sync_recv;
+
+	/* process received async transactions since last frozen */
+	__u32            async_recv;
+};
+
 #define BINDER_WRITE_READ		_IOWR('b', 1, struct binder_write_read)
 #define BINDER_SET_IDLE_TIMEOUT		_IOW('b', 3, __s64)
 #define BINDER_SET_MAX_THREADS		_IOW('b', 5, __u32)
@@ -275,6 +294,8 @@ struct binder_node_info_for_ref {
 #define BINDER_GET_NODE_DEBUG_INFO	_IOWR('b', 11, struct binder_node_debug_info)
 #define BINDER_GET_NODE_INFO_FOR_REF	_IOWR('b', 12, struct binder_node_info_for_ref)
 #define BINDER_SET_CONTEXT_MGR_EXT	_IOW('b', 13, struct flat_binder_object)
+#define BINDER_FREEZE			_IOW('b', 14, struct binder_freeze_info)
+#define BINDER_GET_FROZEN_INFO		_IOWR('b', 15, struct binder_frozen_status_info)
 
 /*
  * NOTE: Two special error codes you should check for when calling
@@ -456,6 +477,12 @@ enum binder_driver_return_protocol {
 	 * The the last transaction (either a bcTRANSACTION or
 	 * a bcATTEMPT_ACQUIRE) failed (e.g. out of memory).  No parameters.
 	 */
+
+	BR_FROZEN_REPLY = _IO('r', 18),
+	/*
+	 * The target of the last transaction (either a bcTRANSACTION or
+	 * a bcATTEMPT_ACQUIRE) is frozen.  No parameters.
+	 */
 };
 
 enum binder_driver_command_protocol {
diff --git a/kernel/sched/wait.c b/kernel/sched/wait.c
index 84bd05117dc2..7d668b31dbc6 100644
--- a/kernel/sched/wait.c
+++ b/kernel/sched/wait.c
@@ -206,6 +206,13 @@ void __wake_up_sync(struct wait_queue_head *wq_head, unsigned int mode, int nr_e
 }
 EXPORT_SYMBOL_GPL(__wake_up_sync);	/* For internal use only */
 
+void __wake_up_pollfree(struct wait_queue_head *wq_head)
+{
+	__wake_up(wq_head, TASK_NORMAL, 0, poll_to_key(EPOLLHUP | POLLFREE));
+	/* POLLFREE must have cleared the queue. */
+	WARN_ON_ONCE(waitqueue_active(wq_head));
+}
+
 /*
  * Note: we use "set_current_state()" _after_ the wait-queue add,
  * because we need a memory barrier there on SMP, so that any
diff --git a/scripts/setlocalversion b/scripts/setlocalversion
index 63a87f45c5c2..fc331309707c 100755
--- a/scripts/setlocalversion
+++ b/scripts/setlocalversion
@@ -41,8 +41,6 @@ if test $# -gt 0; then
 		kmi_generation=$1
 		[ $(expr $kmi_generation : '^[0-9]\+$') -eq 0 ] && usage
 		shift
-	else
-		usage
 	fi
 fi
 if test $# -gt 0 -o ! -d "$srctree"; then
@@ -69,6 +67,8 @@ scm_version()
 
 		if [ -n "$android_release" ] && [ -n "$kmi_generation" ]; then
 			printf '%s' "-$android_release-$kmi_generation"
+		elif [ -n "$android_release" ]; then
+			printf '%s' "-$android_release"
 		fi
 
 		# If we are at a tagged commit (like "v2.6.30-rc6"), we ignore
diff --git a/security/security.c b/security/security.c
index cd2d18d2d279..9335b2e1bcd2 100644
--- a/security/security.c
+++ b/security/security.c
@@ -670,25 +670,25 @@ static void __init lsm_early_task(struct task_struct *task)
 
 /* Security operations */
 
-int security_binder_set_context_mgr(struct task_struct *mgr)
+int security_binder_set_context_mgr(const struct cred *mgr)
 {
 	return call_int_hook(binder_set_context_mgr, 0, mgr);
 }
 
-int security_binder_transaction(struct task_struct *from,
-				struct task_struct *to)
+int security_binder_transaction(const struct cred *from,
+				const struct cred *to)
 {
 	return call_int_hook(binder_transaction, 0, from, to);
 }
 
-int security_binder_transfer_binder(struct task_struct *from,
-				    struct task_struct *to)
+int security_binder_transfer_binder(const struct cred *from,
+				    const struct cred *to)
 {
 	return call_int_hook(binder_transfer_binder, 0, from, to);
 }
 
-int security_binder_transfer_file(struct task_struct *from,
-				  struct task_struct *to, struct file *file)
+int security_binder_transfer_file(const struct cred *from,
+				  const struct cred *to, struct file *file)
 {
 	return call_int_hook(binder_transfer_file, 0, from, to, file);
 }
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 666782f1d8b1..16ce60440e7a 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2059,22 +2059,19 @@ static inline u32 open_file_to_av(struct file *file)
 
 /* Hook functions begin here. */
 
-static int selinux_binder_set_context_mgr(struct task_struct *mgr)
+static int selinux_binder_set_context_mgr(const struct cred *mgr)
 {
-	u32 mysid = current_sid();
-	u32 mgrsid = task_sid(mgr);
-
 	return avc_has_perm(&selinux_state,
-			    mysid, mgrsid, SECCLASS_BINDER,
+			    current_sid(), cred_sid(mgr), SECCLASS_BINDER,
 			    BINDER__SET_CONTEXT_MGR, NULL);
 }
 
-static int selinux_binder_transaction(struct task_struct *from,
-				      struct task_struct *to)
+static int selinux_binder_transaction(const struct cred *from,
+				      const struct cred *to)
 {
 	u32 mysid = current_sid();
-	u32 fromsid = task_sid(from);
-	u32 tosid = task_sid(to);
+	u32 fromsid = cred_sid(from);
+	u32 tosid = cred_sid(to);
 	int rc;
 
 	if (mysid != fromsid) {
@@ -2085,27 +2082,24 @@ static int selinux_binder_transaction(struct task_struct *from,
 			return rc;
 	}
 
-	return avc_has_perm(&selinux_state,
-			    fromsid, tosid, SECCLASS_BINDER, BINDER__CALL,
-			    NULL);
+	return avc_has_perm(&selinux_state, fromsid, tosid,
+			    SECCLASS_BINDER, BINDER__CALL, NULL);
 }
 
-static int selinux_binder_transfer_binder(struct task_struct *from,
-					  struct task_struct *to)
+static int selinux_binder_transfer_binder(const struct cred *from,
+					  const struct cred *to)
 {
-	u32 fromsid = task_sid(from);
-	u32 tosid = task_sid(to);
-
 	return avc_has_perm(&selinux_state,
-			    fromsid, tosid, SECCLASS_BINDER, BINDER__TRANSFER,
+			    cred_sid(from), cred_sid(to),
+			    SECCLASS_BINDER, BINDER__TRANSFER,
 			    NULL);
 }
 
-static int selinux_binder_transfer_file(struct task_struct *from,
-					struct task_struct *to,
+static int selinux_binder_transfer_file(const struct cred *from,
+					const struct cred *to,
 					struct file *file)
 {
-	u32 sid = task_sid(to);
+	u32 sid = cred_sid(to);
 	struct file_security_struct *fsec = selinux_file(file);
 	struct dentry *dentry = file->f_path.dentry;
 	struct inode_security_struct *isec;