Driver core patches for 4.3-rc1

Here is the new patches for the driver core / sysfs for 4.3-rc1.
 
 Very small number of changes here, all the details are in the shortlog,
 nothing major happening at all this kernel release, which is nice to
 see.
 
 Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Merge tag 'driver-core-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core updates from Greg KH:
 "Here is the new patches for the driver core / sysfs for 4.3-rc1.

  Very small number of changes here, all the details are in the
  shortlog, nothing major happening at all this kernel release, which is
  nice to see"

* tag 'driver-core-4.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  bus: subsys: update return type of ->remove_dev() to void
  driver core: correct device's shutdown order
  driver core: fix docbook for device_private.device
  selftests: firmware: skip timeout checks for kernels without user mode helper
  kernel, cpu: Remove bogus __ref annotations
  cpu: Remove bogus __ref annotation of cpu_subsys_online()
  firmware: fix wrong memory deallocation in fw_add_devm_name()
  sysfs.txt: update show method notes about sprintf/snprintf/scnprintf usage
  devres: fix devres_get()

drivers/base/base.h

@@ -63,7 +63,7 @@ struct driver_private {
  *	binding of drivers which were unable to get all the resources needed by
  *	the device; typically because it depends on another driver getting
  *	probed first.
- * @device - pointer back to the struct class that this structure is
+ * @device - pointer back to the struct device that this structure is
  * associated with.
  *
  * Nothing outside of the driver core should ever touch these fields.
@@ -134,6 +134,7 @@ extern int devres_release_all(struct device *dev);
 
 /* /sys/devices directory */
 extern struct kset *devices_kset;
+extern void devices_kset_move_last(struct device *dev);
 
 #if defined(CONFIG_MODULES) && defined(CONFIG_SYSFS)
 extern void module_add_driver(struct module *mod, struct device_driver *drv);

drivers/base/core.c

@@ -533,6 +533,52 @@ static DEVICE_ATTR_RO(dev);
 /* /sys/devices/ */
 struct kset *devices_kset;
 
+/**
+ * devices_kset_move_before - Move device in the devices_kset's list.
+ * @deva: Device to move.
+ * @devb: Device @deva should come before.
+ */
+static void devices_kset_move_before(struct device *deva, struct device *devb)
+{
+	if (!devices_kset)
+		return;
+	pr_debug("devices_kset: Moving %s before %s\n",
+		 dev_name(deva), dev_name(devb));
+	spin_lock(&devices_kset->list_lock);
+	list_move_tail(&deva->kobj.entry, &devb->kobj.entry);
+	spin_unlock(&devices_kset->list_lock);
+}
+
+/**
+ * devices_kset_move_after - Move device in the devices_kset's list.
+ * @deva: Device to move
+ * @devb: Device @deva should come after.
+ */
+static void devices_kset_move_after(struct device *deva, struct device *devb)
+{
+	if (!devices_kset)
+		return;
+	pr_debug("devices_kset: Moving %s after %s\n",
+		 dev_name(deva), dev_name(devb));
+	spin_lock(&devices_kset->list_lock);
+	list_move(&deva->kobj.entry, &devb->kobj.entry);
+	spin_unlock(&devices_kset->list_lock);
+}
+
+/**
+ * devices_kset_move_last - move the device to the end of devices_kset's list.
+ * @dev: device to move
+ */
+void devices_kset_move_last(struct device *dev)
+{
+	if (!devices_kset)
+		return;
+	pr_debug("devices_kset: Moving %s to end of list\n", dev_name(dev));
+	spin_lock(&devices_kset->list_lock);
+	list_move_tail(&dev->kobj.entry, &devices_kset->list);
+	spin_unlock(&devices_kset->list_lock);
+}
+
 /**
  * device_create_file - create sysfs attribute file for device.
  * @dev: device.
@@ -1923,12 +1969,15 @@ int device_move(struct device *dev, struct device *new_parent,
 		break;
 	case DPM_ORDER_DEV_AFTER_PARENT:
 		device_pm_move_after(dev, new_parent);
+		devices_kset_move_after(dev, new_parent);
 		break;
 	case DPM_ORDER_PARENT_BEFORE_DEV:
 		device_pm_move_before(new_parent, dev);
+		devices_kset_move_before(new_parent, dev);
 		break;
 	case DPM_ORDER_DEV_LAST:
 		device_pm_move_last(dev);
+		devices_kset_move_last(dev);
 		break;
 	}
 

drivers/base/cpu.c

@@ -41,7 +41,7 @@ static void change_cpu_under_node(struct cpu *cpu,
 	cpu->node_id = to_nid;
 }
 
-static int __ref cpu_subsys_online(struct device *dev)
+static int cpu_subsys_online(struct device *dev)
 {
 	struct cpu *cpu = container_of(dev, struct cpu, dev);
 	int cpuid = dev->id;

drivers/base/dd.c

@@ -304,6 +304,14 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 			goto probe_failed;
 	}
 
+	/*
+	 * Ensure devices are listed in devices_kset in correct order
+	 * It's important to move Dev to the end of devices_kset before
+	 * calling .probe, because it could be recursive and parent Dev
+	 * should always go first
+	 */
+	devices_kset_move_last(dev);
+
 	if (dev->bus->probe) {
 		ret = dev->bus->probe(dev);
 		if (ret)

drivers/base/devres.c

@@ -297,10 +297,10 @@ void * devres_get(struct device *dev, void *new_res,
 	if (!dr) {
 		add_dr(dev, &new_dr->node);
 		dr = new_dr;
-		new_dr = NULL;
+		new_res = NULL;
 	}
 	spin_unlock_irqrestore(&dev->devres_lock, flags);
-	devres_free(new_dr);
+	devres_free(new_res);
 
 	return dr->data;
 }

drivers/base/firmware_class.c

@@ -443,7 +443,7 @@ static int fw_add_devm_name(struct device *dev, const char *name)
 		return -ENOMEM;
 	fwn->name = kstrdup_const(name, GFP_KERNEL);
 	if (!fwn->name) {
-		kfree(fwn);
+		devres_free(fwn);
 		return -ENOMEM;
 	}