Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-2.6:
  SCSI: fix race in device_create
  USB: Core: fix race in device_create
  USB: Phidget: fix race in device_create
  s390: fix race in device_create
  SOUND: fix race in device_create
  UIO: fix race in device_create
  Power Supply: fix race in device_create
  LEDS: fix race in device_create
  IB: fix race in device_create
  ide: fix race in device_create
  fbdev: fix race in device_create
  mm: bdi: fix race in bdi_class device creation
  Driver core: add device_create_vargs and device_create_drvdata

20 files changed, 157 insertions, 86 deletions

diff --git a/drivers/base/core.c b/drivers/base/core.c
index be288b5e4180..f861c2b1dcff 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -1084,11 +1084,13 @@ static void device_create_release(struct device *dev)
 }
 
 /**
- * device_create - creates a device and registers it with sysfs
+ * device_create_vargs - creates a device and registers it with sysfs
  * @class: pointer to the struct class that this device should be registered to
  * @parent: pointer to the parent struct device of this new device, if any
  * @devt: the dev_t for the char device to be added
+ * @drvdata: the data to be added to the device for callbacks
  * @fmt: string for the device's name
+ * @args: va_list for the device's name
  *
  * This function can be used by char device classes.  A struct device
  * will be created in sysfs, registered to the specified class.
@@ -1104,10 +1106,10 @@ static void device_create_release(struct device *dev)
  * Note: the struct class passed to this function must have previously
  * been created with a call to class_create().
  */
-struct device *device_create(struct class *class, struct device *parent,
-			     dev_t devt, const char *fmt, ...)
+struct device *device_create_vargs(struct class *class, struct device *parent,
+				   dev_t devt, void *drvdata, const char *fmt,
+				   va_list args)
 {
-	va_list args;
 	struct device *dev = NULL;
 	int retval = -ENODEV;
 
@@ -1124,10 +1126,9 @@ struct device *device_create(struct class *class, struct device *parent,
 	dev->class = class;
 	dev->parent = parent;
 	dev->release = device_create_release;
+	dev_set_drvdata(dev, drvdata);
 
-	va_start(args, fmt);
 	vsnprintf(dev->bus_id, BUS_ID_SIZE, fmt, args);
-	va_end(args);
 	retval = device_register(dev);
 	if (retval)
 		goto error;
@@ -1138,6 +1139,78 @@ error:
 	kfree(dev);
 	return ERR_PTR(retval);
 }
+EXPORT_SYMBOL_GPL(device_create_vargs);
+
+/**
+ * device_create_drvdata - creates a device and registers it with sysfs
+ * @class: pointer to the struct class that this device should be registered to
+ * @parent: pointer to the parent struct device of this new device, if any
+ * @devt: the dev_t for the char device to be added
+ * @drvdata: the data to be added to the device for callbacks
+ * @fmt: string for the device's name
+ *
+ * This function can be used by char device classes.  A struct device
+ * will be created in sysfs, registered to the specified class.
+ *
+ * A "dev" file will be created, showing the dev_t for the device, if
+ * the dev_t is not 0,0.
+ * If a pointer to a parent struct device is passed in, the newly created
+ * struct device will be a child of that device in sysfs.
+ * The pointer to the struct device will be returned from the call.
+ * Any further sysfs files that might be required can be created using this
+ * pointer.
+ *
+ * Note: the struct class passed to this function must have previously
+ * been created with a call to class_create().
+ */
+struct device *device_create_drvdata(struct class *class,
+				     struct device *parent,
+				     dev_t devt,
+				     void *drvdata,
+				     const char *fmt, ...)
+{
+	va_list vargs;
+	struct device *dev;
+
+	va_start(vargs, fmt);
+	dev = device_create_vargs(class, parent, devt, drvdata, fmt, vargs);
+	va_end(vargs);
+	return dev;
+}
+EXPORT_SYMBOL_GPL(device_create_drvdata);
+
+/**
+ * device_create - creates a device and registers it with sysfs
+ * @class: pointer to the struct class that this device should be registered to
+ * @parent: pointer to the parent struct device of this new device, if any
+ * @devt: the dev_t for the char device to be added
+ * @fmt: string for the device's name
+ *
+ * This function can be used by char device classes.  A struct device
+ * will be created in sysfs, registered to the specified class.
+ *
+ * A "dev" file will be created, showing the dev_t for the device, if
+ * the dev_t is not 0,0.
+ * If a pointer to a parent struct device is passed in, the newly created
+ * struct device will be a child of that device in sysfs.
+ * The pointer to the struct device will be returned from the call.
+ * Any further sysfs files that might be required can be created using this
+ * pointer.
+ *
+ * Note: the struct class passed to this function must have previously
+ * been created with a call to class_create().
+ */
+struct device *device_create(struct class *class, struct device *parent,
+			     dev_t devt, const char *fmt, ...)
+{
+	va_list vargs;
+	struct device *dev;
+
+	va_start(vargs, fmt);
+	dev = device_create_vargs(class, parent, devt, NULL, fmt, vargs);
+	va_end(vargs);
+	return dev;
+}
 EXPORT_SYMBOL_GPL(device_create);
 
 static int __match_devt(struct device *dev, void *data)
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 34b0d4f26b58..655ec7ef568a 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -648,13 +648,12 @@ static int ide_register_port(ide_hwif_t *hwif)
 
 	get_device(&hwif->gendev);
 
-	hwif->portdev = device_create(ide_port_class, &hwif->gendev,
-				      MKDEV(0, 0), hwif->name);
+	hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
+					      MKDEV(0, 0), hwif, hwif->name);
 	if (IS_ERR(hwif->portdev)) {
 		ret = PTR_ERR(hwif->portdev);
 		device_unregister(&hwif->gendev);
 	}
-	dev_set_drvdata(hwif->portdev, hwif);
 out:
 	return ret;
 }
diff --git a/drivers/infiniband/core/user_mad.c b/drivers/infiniband/core/user_mad.c
index 3aa2db54eae4..840ede9ae965 100644
--- a/drivers/infiniband/core/user_mad.c
+++ b/drivers/infiniband/core/user_mad.c
@@ -1005,8 +1005,9 @@ static int ib_umad_init_port(struct ib_device *device, int port_num,
 	if (cdev_add(port->cdev, base_dev + port->dev_num, 1))
 		goto err_cdev;
 
-	port->dev = device_create(umad_class, device->dma_device,
-				  port->cdev->dev, "umad%d", port->dev_num);
+	port->dev = device_create_drvdata(umad_class, device->dma_device,
+					  port->cdev->dev, port,
+					  "umad%d", port->dev_num);
 	if (IS_ERR(port->dev))
 		goto err_cdev;
 
@@ -1024,15 +1025,12 @@ static int ib_umad_init_port(struct ib_device *device, int port_num,
 	if (cdev_add(port->sm_cdev, base_dev + port->dev_num + IB_UMAD_MAX_PORTS, 1))
 		goto err_sm_cdev;
 
-	port->sm_dev = device_create(umad_class, device->dma_device,
-				     port->sm_cdev->dev,
-				     "issm%d", port->dev_num);
+	port->sm_dev = device_create_drvdata(umad_class, device->dma_device,
+					     port->sm_cdev->dev, port,
+					     "issm%d", port->dev_num);
 	if (IS_ERR(port->sm_dev))
 		goto err_sm_cdev;
 
-	dev_set_drvdata(port->dev,    port);
-	dev_set_drvdata(port->sm_dev, port);
-
 	if (device_create_file(port->sm_dev, &dev_attr_ibdev))
 		goto err_sm_dev;
 	if (device_create_file(port->sm_dev, &dev_attr_port))
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index cc1afa28c181..f806da184b51 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -755,14 +755,15 @@ static void ib_uverbs_add_one(struct ib_device *device)
 	if (cdev_add(uverbs_dev->cdev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
 		goto err_cdev;
 
-	uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
-					uverbs_dev->cdev->dev,
-					"uverbs%d", uverbs_dev->devnum);
+	uverbs_dev->dev = device_create_drvdata(uverbs_class,
+						device->dma_device,
+						uverbs_dev->cdev->dev,
+						uverbs_dev,
+						"uverbs%d",
+						uverbs_dev->devnum);
 	if (IS_ERR(uverbs_dev->dev))
 		goto err_cdev;
 
-	dev_set_drvdata(uverbs_dev->dev, uverbs_dev);
-
 	if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
 		goto err_class;
 	if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
diff --git a/drivers/leds/led-class.c b/drivers/leds/led-class.c
index b3c54be74556..559a40861c39 100644
--- a/drivers/leds/led-class.c
+++ b/drivers/leds/led-class.c
@@ -103,13 +103,11 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
 {
 	int rc;
 
-	led_cdev->dev = device_create(leds_class, parent, 0, "%s",
-					    led_cdev->name);
+	led_cdev->dev = device_create_drvdata(leds_class, parent, 0, led_cdev,
+					      "%s", led_cdev->name);
 	if (IS_ERR(led_cdev->dev))
 		return PTR_ERR(led_cdev->dev);
 
-	dev_set_drvdata(led_cdev->dev, led_cdev);
-
 	/* register the attributes */
 	rc = device_create_file(led_cdev->dev, &dev_attr_brightness);
 	if (rc)
diff --git a/drivers/power/power_supply_core.c b/drivers/power/power_supply_core.c
index 138dd76ee347..af1633eb3b70 100644
--- a/drivers/power/power_supply_core.c
+++ b/drivers/power/power_supply_core.c
@@ -91,15 +91,13 @@ int power_supply_register(struct device *parent, struct power_supply *psy)
 {
 	int rc = 0;
 
-	psy->dev = device_create(power_supply_class, parent, 0,
-				 "%s", psy->name);
+	psy->dev = device_create_drvdata(power_supply_class, parent, 0,
+					 psy, "%s", psy->name);
 	if (IS_ERR(psy->dev)) {
 		rc = PTR_ERR(psy->dev);
 		goto dev_create_failed;
 	}
 
-	dev_set_drvdata(psy->dev, psy);
-
 	INIT_WORK(&psy->changed_work, power_supply_changed_work);
 
 	rc = power_supply_create_attrs(psy);
diff --git a/drivers/s390/char/vmlogrdr.c b/drivers/s390/char/vmlogrdr.c
index e8487347e4d4..2c2428cc05d8 100644
--- a/drivers/s390/char/vmlogrdr.c
+++ b/drivers/s390/char/vmlogrdr.c
@@ -762,10 +762,10 @@ static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv)
 		device_unregister(dev);
 		return ret;
 	}
-	priv->class_device = device_create(vmlogrdr_class, dev,
-					   MKDEV(vmlogrdr_major,
-						 priv->minor_num),
-					   "%s", dev->bus_id);
+	priv->class_device = device_create_drvdata(vmlogrdr_class, dev,
+						   MKDEV(vmlogrdr_major,
+							 priv->minor_num),
+						   priv, "%s", dev->bus_id);
 	if (IS_ERR(priv->class_device)) {
 		ret = PTR_ERR(priv->class_device);
 		priv->class_device=NULL;
@@ -773,7 +773,6 @@ static int vmlogrdr_register_device(struct vmlogrdr_priv_t *priv)
 		device_unregister(dev);
 		return ret;
 	}
-	dev->driver_data = priv;
 	priv->device = dev;
 	return 0;
 }
diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index 75c84d7b9ce8..c4b938bc30d3 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -910,9 +910,9 @@ static int ch_probe(struct device *dev)
 	ch->minor = minor;
 	sprintf(ch->name,"ch%d",ch->minor);
 
-	class_dev = device_create(ch_sysfs_class, dev,
-				  MKDEV(SCSI_CHANGER_MAJOR,ch->minor),
-				  "s%s", ch->name);
+	class_dev = device_create_drvdata(ch_sysfs_class, dev,
+					  MKDEV(SCSI_CHANGER_MAJOR, ch->minor),
+					  ch, "s%s", ch->name);
 	if (IS_ERR(class_dev)) {
 		printk(KERN_WARNING "ch%d: device_create failed\n",
 		       ch->minor);
@@ -926,7 +926,6 @@ static int ch_probe(struct device *dev)
 	if (init)
 		ch_init_elem(ch);
 
-	dev_set_drvdata(dev, ch);
 	sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
 
 	return 0;
diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c
index 31f7aec44d90..243d8becd30f 100644
--- a/drivers/scsi/osst.c
+++ b/drivers/scsi/osst.c
@@ -5695,13 +5695,12 @@ static int osst_sysfs_add(dev_t dev, struct device *device, struct osst_tape * S
 	struct device *osst_member;
 	int err;
 
-	osst_member = device_create(osst_sysfs_class, device, dev, "%s", name);
+	osst_member = device_create_drvdata(osst_sysfs_class, device, dev, STp, "%s", name);
 	if (IS_ERR(osst_member)) {
 		printk(KERN_WARNING "osst :W: Unable to add sysfs class member %s\n", name);
 		return PTR_ERR(osst_member);
 	}
 
-	dev_set_drvdata(osst_member, STp);
 	err = device_create_file(osst_member, &dev_attr_ADR_rev);
 	if (err)
 		goto err_out;
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index c9d7f721b9e2..ea0edd1b2e76 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1441,17 +1441,18 @@ sg_add(struct device *cl_dev, struct class_interface *cl_intf)
 	if (sg_sysfs_valid) {
 		struct device *sg_class_member;
 
-		sg_class_member = device_create(sg_sysfs_class, cl_dev->parent,
-						MKDEV(SCSI_GENERIC_MAJOR,
-						      sdp->index),
-						"%s", disk->disk_name);
+		sg_class_member = device_create_drvdata(sg_sysfs_class,
+							cl_dev->parent,
+							MKDEV(SCSI_GENERIC_MAJOR,
+							      sdp->index),
+							sdp,
+							"%s", disk->disk_name);
 		if (IS_ERR(sg_class_member)) {
 			printk(KERN_ERR "sg_add: "
 			       "device_create failed\n");
 			error = PTR_ERR(sg_class_member);
 			goto cdev_add_err;
 		}
-		dev_set_drvdata(sg_class_member, sdp);
 		error = sysfs_create_link(&scsidp->sdev_gendev.kobj,
 					  &sg_class_member->kobj, "generic");
 		if (error)
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index e8db66ad0bde..6e5a5bb31311 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -4424,17 +4424,19 @@ static int do_create_class_files(struct scsi_tape *STp, int dev_num, int mode)
 		snprintf(name, 10, "%s%s%s", rew ? "n" : "",
 			 STp->disk->disk_name, st_formats[i]);
 		st_class_member =
-			device_create(st_sysfs_class, &STp->device->sdev_gendev,
-				      MKDEV(SCSI_TAPE_MAJOR,
-						TAPE_MINOR(dev_num, mode, rew)),
-				      "%s", name);
+			device_create_drvdata(st_sysfs_class,
+					      &STp->device->sdev_gendev,
+					      MKDEV(SCSI_TAPE_MAJOR,
+						    TAPE_MINOR(dev_num,
+							      mode, rew)),
+					      &STp->modes[mode],
+					      "%s", name);
 		if (IS_ERR(st_class_member)) {
 			printk(KERN_WARNING "st%d: device_create failed\n",
 			       dev_num);
 			error = PTR_ERR(st_class_member);
 			goto out;
 		}
-		dev_set_drvdata(st_class_member, &STp->modes[mode]);
 
 		error = device_create_file(st_class_member,
 					   &dev_attr_defined);
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 55cc7b80422a..0a12e90ad416 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -649,15 +649,14 @@ int __uio_register_device(struct module *owner,
 	if (ret)
 		goto err_get_minor;
 
-	idev->dev = device_create(uio_class->class, parent,
-				  MKDEV(uio_major, idev->minor),
-				  "uio%d", idev->minor);
+	idev->dev = device_create_drvdata(uio_class->class, parent,
+					  MKDEV(uio_major, idev->minor), idev,
+					  "uio%d", idev->minor);
 	if (IS_ERR(idev->dev)) {
 		printk(KERN_ERR "UIO: device register failed\n");
 		ret = PTR_ERR(idev->dev);
 		goto err_device_create;
 	}
-	dev_set_drvdata(idev->dev, idev);
 
 	ret = uio_dev_add_attributes(idev);
 	if (ret)
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index bf10e9c4195e..09a53e7f3327 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -818,12 +818,12 @@ static int usb_register_bus(struct usb_bus *bus)
 	set_bit (busnum, busmap.busmap);
 	bus->busnum = busnum;
 
-	bus->dev = device_create(usb_host_class, bus->controller, MKDEV(0, 0),
-				 "usb_host%d", busnum);
+	bus->dev = device_create_drvdata(usb_host_class, bus->controller,
+					 MKDEV(0, 0), bus,
+					 "usb_host%d", busnum);
 	result = PTR_ERR(bus->dev);
 	if (IS_ERR(bus->dev))
 		goto error_create_class_dev;
-	dev_set_drvdata(bus->dev, bus);
 
 	/* Add it to the local list of buses */
 	list_add (&bus->bus_list, &usb_bus_list);
diff --git a/drivers/usb/misc/phidgetkit.c b/drivers/usb/misc/phidgetkit.c
index 24230c638b8e..4cfa25b0f44e 100644
--- a/drivers/usb/misc/phidgetkit.c
+++ b/drivers/usb/misc/phidgetkit.c
@@ -595,14 +595,14 @@ static int interfacekit_probe(struct usb_interface *intf, const struct usb_devic
         } while(value);
         kit->dev_no = bit;
 
-        kit->dev = device_create(phidget_class, &kit->udev->dev, 0,
-               		"interfacekit%d", kit->dev_no);
+	kit->dev = device_create_drvdata(phidget_class, &kit->udev->dev,
+					MKDEV(0, 0), kit,
+					"interfacekit%d", kit->dev_no);
         if (IS_ERR(kit->dev)) {
                 rc = PTR_ERR(kit->dev);
                 kit->dev = NULL;
                 goto out;
         }
-	dev_set_drvdata(kit->dev, kit);
 
 	if (usb_submit_urb(kit->irq, GFP_KERNEL)) {
 		rc = -EIO;
diff --git a/drivers/usb/misc/phidgetmotorcontrol.c b/drivers/usb/misc/phidgetmotorcontrol.c
index f0113c17cc5a..9b4696f21b22 100644
--- a/drivers/usb/misc/phidgetmotorcontrol.c
+++ b/drivers/usb/misc/phidgetmotorcontrol.c
@@ -365,16 +365,15 @@ static int motorcontrol_probe(struct usb_interface *intf, const struct usb_devic
 	} while(value);
 	mc->dev_no = bit;
 
-	mc->dev = device_create(phidget_class, &mc->udev->dev, 0,
-				"motorcontrol%d", mc->dev_no);
+	mc->dev = device_create_drvdata(phidget_class, &mc->udev->dev,
+					MKDEV(0, 0), mc,
+					"motorcontrol%d", mc->dev_no);
 	if (IS_ERR(mc->dev)) {
 		rc = PTR_ERR(mc->dev);
 		mc->dev = NULL;
 		goto out;
 	}
 
-	dev_set_drvdata(mc->dev, mc);
-
 	if (usb_submit_urb(mc->irq, GFP_KERNEL)) {
 		rc = -EIO;
 		goto out;
diff --git a/drivers/usb/misc/phidgetservo.c b/drivers/usb/misc/phidgetservo.c
index 7d590c09434a..1ca7ddb41d4d 100644
--- a/drivers/usb/misc/phidgetservo.c
+++ b/drivers/usb/misc/phidgetservo.c
@@ -275,14 +275,14 @@ servo_probe(struct usb_interface *interface, const struct usb_device_id *id)
         } while (value);
 	dev->dev_no = bit;
 
-	dev->dev = device_create(phidget_class, &dev->udev->dev, 0,
-				 "servo%d", dev->dev_no);
+	dev->dev = device_create_drvdata(phidget_class, &dev->udev->dev,
+					 MKDEV(0, 0), dev,
+					 "servo%d", dev->dev_no);
 	if (IS_ERR(dev->dev)) {
 		rc = PTR_ERR(dev->dev);
 		dev->dev = NULL;
 		goto out;
 	}
-	dev_set_drvdata(dev->dev, dev);
 
 	servo_count = dev->type & SERVO_COUNT_QUAD ? 4 : 1;
 
diff --git a/drivers/video/display/display-sysfs.c b/drivers/video/display/display-sysfs.c
index 35477177bef4..6ef800bdf482 100644
--- a/drivers/video/display/display-sysfs.c
+++ b/drivers/video/display/display-sysfs.c
@@ -26,6 +26,7 @@
 #include <linux/ctype.h>
 #include <linux/idr.h>
 #include <linux/err.h>
+#include <linux/kdev_t.h>
 
 static ssize_t display_show_name(struct device *dev,
 				struct device_attribute *attr, char *buf)
@@ -152,10 +153,13 @@ struct display_device *display_device_register(struct display_driver *driver,
 		mutex_unlock(&allocated_dsp_lock);
 
 		if (!ret) {
-			new_dev->dev = device_create(display_class, parent, 0,
-						"display%d", new_dev->idx);
+			new_dev->dev = device_create_drvdata(display_class,
+							     parent,
+							     MKDEV(0,0),
+							     new_dev,
+							     "display%d",
+							     new_dev->idx);
 			if (!IS_ERR(new_dev->dev)) {
-				dev_set_drvdata(new_dev->dev, new_dev);
 				new_dev->parent = parent;
 				new_dev->driver = driver;
 				mutex_init(&new_dev->lock);
diff --git a/include/linux/device.h b/include/linux/device.h
index 15e9fa3ad3af..14616e80213c 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -449,9 +449,21 @@ extern int __must_check device_reprobe(struct device *dev);
 /*
  * Easy functions for dynamically creating devices on the fly
  */
+extern struct device *device_create_vargs(struct class *cls,
+					  struct device *parent,
+					  dev_t devt,
+					  void *drvdata,
+					  const char *fmt,
+					  va_list vargs);
 extern struct device *device_create(struct class *cls, struct device *parent,
 				    dev_t devt, const char *fmt, ...)
 				    __attribute__((format(printf, 4, 5)));
+extern struct device *device_create_drvdata(struct class *cls,
+					    struct device *parent,
+					    dev_t devt,
+					    void *drvdata,
+					    const char *fmt, ...)
+				    __attribute__((format(printf, 5, 6)));
 extern void device_destroy(struct class *cls, dev_t devt);
 
 /*
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 7c4f9e097095..f2e574dbc300 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -172,30 +172,22 @@ postcore_initcall(bdi_class_init);
 int bdi_register(struct backing_dev_info *bdi, struct device *parent,
 		const char *fmt, ...)
 {
-	char *name;
 	va_list args;
 	int ret = 0;
 	struct device *dev;
 
 	va_start(args, fmt);
-	name = kvasprintf(GFP_KERNEL, fmt, args);
+	dev = device_create_vargs(bdi_class, parent, MKDEV(0, 0), bdi, fmt, args);
 	va_end(args);
-
-	if (!name)
-		return -ENOMEM;
-
-	dev = device_create(bdi_class, parent, MKDEV(0, 0), name);
 	if (IS_ERR(dev)) {
 		ret = PTR_ERR(dev);
 		goto exit;
 	}
 
 	bdi->dev = dev;
-	dev_set_drvdata(bdi->dev, bdi);
-	bdi_debug_register(bdi, name);
+	bdi_debug_register(bdi, dev_name(dev));
 
 exit:
-	kfree(name);
 	return ret;
 }
 EXPORT_SYMBOL(bdi_register);
diff --git a/sound/core/sound.c b/sound/core/sound.c
index 812f91b3de5b..6c8ab48c689a 100644
--- a/sound/core/sound.c
+++ b/sound/core/sound.c
@@ -259,8 +259,9 @@ int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
 		return minor;
 	}
 	snd_minors[minor] = preg;
-	preg->dev = device_create(sound_class, device, MKDEV(major, minor),
-				  "%s", name);
+	preg->dev = device_create_drvdata(sound_class, device,
+					  MKDEV(major, minor),
+					  private_data, "%s", name);
 	if (IS_ERR(preg->dev)) {
 		snd_minors[minor] = NULL;
 		mutex_unlock(&sound_mutex);
@@ -269,9 +270,6 @@ int snd_register_device_for_dev(int type, struct snd_card *card, int dev,
 		return minor;
 	}
 
-	if (preg->dev)
-		dev_set_drvdata(preg->dev, private_data);
-
 	mutex_unlock(&sound_mutex);
 	return 0;
 }