char/misc patches for 4.12-rc1

Here is the big set of new char/misc driver drivers and features for
 4.12-rc1.
 
 There's lots of new drivers added this time around, new firmware drivers
 from Google, more auxdisplay drivers, extcon drivers, fpga drivers, and
 a bunch of other driver updates.  Nothing major, except if you happen to
 have the hardware for these drivers, and then you will be happy :)
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Merge tag 'char-misc-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver updates from Greg KH:
 "Here is the big set of new char/misc driver drivers and features for
  4.12-rc1.

  There's lots of new drivers added this time around, new firmware
  drivers from Google, more auxdisplay drivers, extcon drivers, fpga
  drivers, and a bunch of other driver updates. Nothing major, except if
  you happen to have the hardware for these drivers, and then you will
  be happy :)

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'char-misc-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (136 commits)
  firmware: google memconsole: Fix return value check in platform_memconsole_init()
  firmware: Google VPD: Fix return value check in vpd_platform_init()
  goldfish_pipe: fix build warning about using too much stack.
  goldfish_pipe: An implementation of more parallel pipe
  fpga fr br: update supported version numbers
  fpga: region: release FPGA region reference in error path
  fpga altera-hps2fpga: disable/unprepare clock on error in alt_fpga_bridge_probe()
  mei: drop the TODO from samples
  firmware: Google VPD sysfs driver
  firmware: Google VPD: import lib_vpd source files
  misc: lkdtm: Add volatile to intentional NULL pointer reference
  eeprom: idt_89hpesx: Add OF device ID table
  misc: ds1682: Add OF device ID table
  misc: tsl2550: Add OF device ID table
  w1: Remove unneeded use of assert() and remove w1_log.h
  w1: Use kernel common min() implementation
  uio_mf624: Align memory regions to page size and set correct offsets
  uio_mf624: Refactor memory info initialization
  uio: Allow handling of non page-aligned memory regions
  hangcheck-timer: Fix typo in comment
  ...

drivers/rapidio/devices/rio_mport_cdev.c

@@ -2444,31 +2444,25 @@ static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
 	mutex_init(&md->buf_mutex);
 	mutex_init(&md->file_mutex);
 	INIT_LIST_HEAD(&md->file_list);
-	cdev_init(&md->cdev, &mport_fops);
-	md->cdev.owner = THIS_MODULE;
-	ret = cdev_add(&md->cdev, MKDEV(MAJOR(dev_number), mport->id), 1);
-	if (ret < 0) {
-		kfree(md);
-		rmcd_error("Unable to register a device, err=%d", ret);
-		return NULL;
-	}
 
-	md->dev.devt = md->cdev.dev;
+	device_initialize(&md->dev);
+	md->dev.devt = MKDEV(MAJOR(dev_number), mport->id);
 	md->dev.class = dev_class;
 	md->dev.parent = &mport->dev;
 	md->dev.release = mport_device_release;
 	dev_set_name(&md->dev, DEV_NAME "%d", mport->id);
 	atomic_set(&md->active, 1);
 
-	ret = device_register(&md->dev);
+	cdev_init(&md->cdev, &mport_fops);
+	md->cdev.owner = THIS_MODULE;
+
+	ret = cdev_device_add(&md->cdev, &md->dev);
 	if (ret) {
 		rmcd_error("Failed to register mport %d (err=%d)",
 		       mport->id, ret);
 		goto err_cdev;
 	}
 
-	get_device(&md->dev);
-
 	INIT_LIST_HEAD(&md->doorbells);
 	spin_lock_init(&md->db_lock);
 	INIT_LIST_HEAD(&md->portwrites);
@@ -2513,8 +2507,7 @@ static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
 	return md;
 
 err_cdev:
-	cdev_del(&md->cdev);
-	kfree(md);
+	put_device(&md->dev);
 	return NULL;
 }
 
@@ -2578,7 +2571,7 @@ static void mport_cdev_remove(struct mport_dev *md)
 	atomic_set(&md->active, 0);
 	mport_cdev_terminate_dma(md);
 	rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler);
-	cdev_del(&(md->cdev));
+	cdev_device_del(&md->cdev, &md->dev);
 	mport_cdev_kill_fasync(md);
 
 	flush_workqueue(dma_wq);
@@ -2603,7 +2596,6 @@ static void mport_cdev_remove(struct mport_dev *md)
 
 	rio_release_inb_dbell(md->mport, 0, 0x0fff);
 
-	device_unregister(&md->dev);
 	put_device(&md->dev);
 }
 

drivers/rapidio/rio-sysfs.c

@@ -108,15 +108,11 @@ static struct attribute *rio_dev_attrs[] = {
 	&dev_attr_lprev.attr,
 	&dev_attr_destid.attr,
 	&dev_attr_modalias.attr,
-	NULL,
-};
 
-static const struct attribute_group rio_dev_group = {
-	.attrs = rio_dev_attrs,
-};
-
-const struct attribute_group *rio_dev_groups[] = {
-	&rio_dev_group,
+	/* Switch-only attributes */
+	&dev_attr_routes.attr,
+	&dev_attr_lnext.attr,
+	&dev_attr_hopcount.attr,
 	NULL,
 };
 
@@ -259,46 +255,40 @@ static struct bin_attribute rio_config_attr = {
 	.write = rio_write_config,
 };
 
-/**
- * rio_create_sysfs_dev_files - create RIO specific sysfs files
- * @rdev: device whose entries should be created
- *
- * Create files when @rdev is added to sysfs.
- */
-int rio_create_sysfs_dev_files(struct rio_dev *rdev)
+static struct bin_attribute *rio_dev_bin_attrs[] = {
+	&rio_config_attr,
+	NULL,
+};
+
+static umode_t rio_dev_is_attr_visible(struct kobject *kobj,
+				       struct attribute *attr, int n)
 {
-	int err = 0;
+	struct rio_dev *rdev = to_rio_dev(kobj_to_dev(kobj));
+	umode_t mode = attr->mode;
 
-	err = device_create_bin_file(&rdev->dev, &rio_config_attr);
-
-	if (!err && (rdev->pef & RIO_PEF_SWITCH)) {
-		err |= device_create_file(&rdev->dev, &dev_attr_routes);
-		err |= device_create_file(&rdev->dev, &dev_attr_lnext);
-		err |= device_create_file(&rdev->dev, &dev_attr_hopcount);
+	if (!(rdev->pef & RIO_PEF_SWITCH) &&
+	    (attr == &dev_attr_routes.attr ||
+	     attr == &dev_attr_lnext.attr ||
+	     attr == &dev_attr_hopcount.attr)) {
+		/*
+		 * Hide switch-specific attributes for a non-switch device.
+		 */
+		mode = 0;
 	}
 
-	if (err)
-		pr_warning("RIO: Failed to create attribute file(s) for %s\n",
-			   rio_name(rdev));
-
-	return err;
+	return mode;
 }
 
-/**
- * rio_remove_sysfs_dev_files - cleanup RIO specific sysfs files
- * @rdev: device whose entries we should free
- *
- * Cleanup when @rdev is removed from sysfs.
- */
-void rio_remove_sysfs_dev_files(struct rio_dev *rdev)
-{
-	device_remove_bin_file(&rdev->dev, &rio_config_attr);
-	if (rdev->pef & RIO_PEF_SWITCH) {
-		device_remove_file(&rdev->dev, &dev_attr_routes);
-		device_remove_file(&rdev->dev, &dev_attr_lnext);
-		device_remove_file(&rdev->dev, &dev_attr_hopcount);
-	}
-}
+static const struct attribute_group rio_dev_group = {
+	.attrs		= rio_dev_attrs,
+	.is_visible	= rio_dev_is_attr_visible,
+	.bin_attrs	= rio_dev_bin_attrs,
+};
+
+const struct attribute_group *rio_dev_groups[] = {
+	&rio_dev_group,
+	NULL,
+};
 
 static ssize_t bus_scan_store(struct bus_type *bus, const char *buf,
 				size_t count)

drivers/rapidio/rio.c

@@ -192,8 +192,6 @@ int rio_add_device(struct rio_dev *rdev)
 	}
 	spin_unlock(&rio_global_list_lock);
 
-	rio_create_sysfs_dev_files(rdev);
-
 	return 0;
 }
 EXPORT_SYMBOL_GPL(rio_add_device);
@@ -220,7 +218,6 @@ void rio_del_device(struct rio_dev *rdev, enum rio_device_state state)
 		}
 	}
 	spin_unlock(&rio_global_list_lock);
-	rio_remove_sysfs_dev_files(rdev);
 	device_unregister(&rdev->dev);
 }
 EXPORT_SYMBOL_GPL(rio_del_device);

drivers/rapidio/rio.h

@@ -27,8 +27,6 @@ extern u32 rio_mport_get_efb(struct rio_mport *port, int local, u16 destid,
 			     u8 hopcount, u32 from);
 extern int rio_mport_chk_dev_access(struct rio_mport *mport, u16 destid,
 				    u8 hopcount);
-extern int rio_create_sysfs_dev_files(struct rio_dev *rdev);
-extern void rio_remove_sysfs_dev_files(struct rio_dev *rdev);
 extern int rio_lock_device(struct rio_mport *port, u16 destid,
 			u8 hopcount, int wait_ms);
 extern int rio_unlock_device(struct rio_mport *port, u16 destid, u8 hopcount);