Merge tag 'driver-core-3.10-rc1' of...

Merge tag 'driver-core-3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core update from Greg Kroah-Hartman:
 "Here's the merge request for the driver core tree for 3.10-rc1

  It's pretty small, just a number of driver core and sysfs updates and
  fixes, all of which have been in linux-next for a while now.

  Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>"

Fixed conflict in kernel/rtmutex-tester.c, the locking tree had a better
fix for the same sysfs file mode problem.

* tag 'driver-core-3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core:
  PM / Runtime: Idle devices asynchronously after probe|release
  driver core: handle user namespaces properly with the uid/gid devtmpfs change
  driver core: devtmpfs: fix compile failure with CONFIG_UIDGID_STRICT_TYPE_CHECKS
  devtmpfs: add base.h include
  driver core: add uid and gid to devtmpfs
  sysfs: check if one entry has been removed before freeing
  sysfs: fix crash_notes_size build warning
  sysfs: fix use after free in case of concurrent read/write and readdir
  rtmutex-tester: fix mode of sysfs files
  Documentation: Add ABI entry for crash_notes and crash_notes_size
  sysfs: Add crash_notes_size to export percpu note size
  driver core: platform_device.h: fix checkpatch errors and warnings
  driver core: platform.c: fix checkpatch errors and warnings
  driver core: warn that platform_driver_probe can not use deferred probing
  sysfs: use atomic_inc_unless_negative in sysfs_get_active
  base: core: WARN() about bogus permissions on device attributes
  device: separate all subsys mutexes

Documentation/ABI/testing/sysfs-devices-system-cpu

@@ -173,3 +173,15 @@ Description:	Processor frequency boosting control
 		Boosting allows the CPU and the firmware to run at a frequency
 		beyound it's nominal limit.
 		More details can be found in Documentation/cpu-freq/boost.txt
+
+
+What:		/sys/devices/system/cpu/cpu#/crash_notes
+		/sys/devices/system/cpu/cpu#/crash_notes_size
+Date:		April 2013
+Contact:	kexec@lists.infradead.org
+Description:	address and size of the percpu note.
+
+		crash_notes: the physical address of the memory that holds the
+		note of cpu#.
+
+		crash_notes_size: size of the note of cpu#.

block/genhd.c

@@ -1111,7 +1111,8 @@ struct class block_class = {
 	.name		= "block",
 };
 
-static char *block_devnode(struct device *dev, umode_t *mode)
+static char *block_devnode(struct device *dev, umode_t *mode,
+			   kuid_t *uid, kgid_t *gid)
 {
 	struct gendisk *disk = dev_to_disk(dev);
 

drivers/base/bus.c

@@ -898,18 +898,18 @@ static ssize_t bus_uevent_store(struct bus_type *bus,
 static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store);
 
 /**
- * __bus_register - register a driver-core subsystem
+ * bus_register - register a driver-core subsystem
  * @bus: bus to register
- * @key: lockdep class key
  *
  * Once we have that, we register the bus with the kobject
  * infrastructure, then register the children subsystems it has:
  * the devices and drivers that belong to the subsystem.
  */
-int __bus_register(struct bus_type *bus, struct lock_class_key *key)
+int bus_register(struct bus_type *bus)
 {
 	int retval;
 	struct subsys_private *priv;
+	struct lock_class_key *key = &bus->lock_key;
 
 	priv = kzalloc(sizeof(struct subsys_private), GFP_KERNEL);
 	if (!priv)
@@ -981,7 +981,7 @@ int __bus_register(struct bus_type *bus, struct lock_class_key *key)
 	bus->p = NULL;
 	return retval;
 }
-EXPORT_SYMBOL_GPL(__bus_register);
+EXPORT_SYMBOL_GPL(bus_register);
 
 /**
  * bus_unregister - remove a bus from the system

drivers/base/core.c

@@ -283,15 +283,21 @@ static int dev_uevent(struct kset *kset, struct kobject *kobj,
 		const char *tmp;
 		const char *name;
 		umode_t mode = 0;
+		kuid_t uid = GLOBAL_ROOT_UID;
+		kgid_t gid = GLOBAL_ROOT_GID;
 
 		add_uevent_var(env, "MAJOR=%u", MAJOR(dev->devt));
 		add_uevent_var(env, "MINOR=%u", MINOR(dev->devt));
-		name = device_get_devnode(dev, &mode, &tmp);
+		name = device_get_devnode(dev, &mode, &uid, &gid, &tmp);
 		if (name) {
 			add_uevent_var(env, "DEVNAME=%s", name);
-			kfree(tmp);
 			if (mode)
 				add_uevent_var(env, "DEVMODE=%#o", mode & 0777);
+			if (!uid_eq(uid, GLOBAL_ROOT_UID))
+				add_uevent_var(env, "DEVUID=%u", from_kuid(&init_user_ns, uid));
+			if (!gid_eq(gid, GLOBAL_ROOT_GID))
+				add_uevent_var(env, "DEVGID=%u", from_kgid(&init_user_ns, gid));
+			kfree(tmp);
 		}
 	}
 
@@ -563,8 +569,15 @@ int device_create_file(struct device *dev,
 		       const struct device_attribute *attr)
 {
 	int error = 0;
-	if (dev)
+
+	if (dev) {
+		WARN(((attr->attr.mode & S_IWUGO) && !attr->store),
+				"Write permission without 'store'\n");
+		WARN(((attr->attr.mode & S_IRUGO) && !attr->show),
+				"Read permission without 'show'\n");
 		error = sysfs_create_file(&dev->kobj, &attr->attr);
+	}
+
 	return error;
 }
 
@@ -1274,6 +1287,8 @@ static struct device *next_device(struct klist_iter *i)
  * device_get_devnode - path of device node file
  * @dev: device
  * @mode: returned file access mode
+ * @uid: returned file owner
+ * @gid: returned file group
  * @tmp: possibly allocated string
  *
  * Return the relative path of a possible device node.
@@ -1282,7 +1297,8 @@ static struct device *next_device(struct klist_iter *i)
  * freed by the caller.
  */
 const char *device_get_devnode(struct device *dev,
-			       umode_t *mode, const char **tmp)
+			       umode_t *mode, kuid_t *uid, kgid_t *gid,
+			       const char **tmp)
 {
 	char *s;
 
@@ -1290,7 +1306,7 @@ const char *device_get_devnode(struct device *dev,
 
 	/* the device type may provide a specific name */
 	if (dev->type && dev->type->devnode)
-		*tmp = dev->type->devnode(dev, mode);
+		*tmp = dev->type->devnode(dev, mode, uid, gid);
 	if (*tmp)
 		return *tmp;
 

drivers/base/cpu.c

@@ -132,6 +132,17 @@ static ssize_t show_crash_notes(struct device *dev, struct device_attribute *att
 	return rc;
 }
 static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL);
+
+static ssize_t show_crash_notes_size(struct device *dev,
+				     struct device_attribute *attr,
+				     char *buf)
+{
+	ssize_t rc;
+
+	rc = sprintf(buf, "%zu\n", sizeof(note_buf_t));
+	return rc;
+}
+static DEVICE_ATTR(crash_notes_size, 0400, show_crash_notes_size, NULL);
 #endif
 
 /*
@@ -259,6 +270,9 @@ int __cpuinit register_cpu(struct cpu *cpu, int num)
 #ifdef CONFIG_KEXEC
 	if (!error)
 		error = device_create_file(&cpu->dev, &dev_attr_crash_notes);
+	if (!error)
+		error = device_create_file(&cpu->dev,
+					   &dev_attr_crash_notes_size);
 #endif
 	return error;
 }

drivers/base/dd.c

@@ -380,7 +380,7 @@ int driver_probe_device(struct device_driver *drv, struct device *dev)
 
 	pm_runtime_barrier(dev);
 	ret = really_probe(dev, drv);
-	pm_runtime_idle(dev);
+	pm_request_idle(dev);
 
 	return ret;
 }
@@ -428,7 +428,7 @@ int device_attach(struct device *dev)
 		}
 	} else {
 		ret = bus_for_each_drv(dev->bus, NULL, dev, __device_attach);
-		pm_runtime_idle(dev);
+		pm_request_idle(dev);
 	}
 out_unlock:
 	device_unlock(dev);
@@ -499,7 +499,7 @@ static void __device_release_driver(struct device *dev)
 						     BUS_NOTIFY_UNBIND_DRIVER,
 						     dev);
 
-		pm_runtime_put_sync(dev);
+		pm_runtime_put(dev);
 
 		if (dev->bus && dev->bus->remove)
 			dev->bus->remove(dev);

drivers/base/devtmpfs.c

@@ -24,6 +24,7 @@
 #include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/kthread.h>
+#include "base.h"
 
 static struct task_struct *thread;
 
@@ -41,6 +42,8 @@ static struct req {
 	int err;
 	const char *name;
 	umode_t mode;	/* 0 => delete */
+	kuid_t uid;
+	kgid_t gid;
 	struct device *dev;
 } *requests;
 
@@ -85,7 +88,9 @@ int devtmpfs_create_node(struct device *dev)
 		return 0;
 
 	req.mode = 0;
-	req.name = device_get_devnode(dev, &req.mode, &tmp);
+	req.uid = GLOBAL_ROOT_UID;
+	req.gid = GLOBAL_ROOT_GID;
+	req.name = device_get_devnode(dev, &req.mode, &req.uid, &req.gid, &tmp);
 	if (!req.name)
 		return -ENOMEM;
 
@@ -121,7 +126,7 @@ int devtmpfs_delete_node(struct device *dev)
 	if (!thread)
 		return 0;
 
-	req.name = device_get_devnode(dev, NULL, &tmp);
+	req.name = device_get_devnode(dev, NULL, NULL, NULL, &tmp);
 	if (!req.name)
 		return -ENOMEM;
 
@@ -187,7 +192,8 @@ static int create_path(const char *nodepath)
 	return err;
 }
 
-static int handle_create(const char *nodename, umode_t mode, struct device *dev)
+static int handle_create(const char *nodename, umode_t mode, kuid_t uid,
+			 kgid_t gid, struct device *dev)
 {
 	struct dentry *dentry;
 	struct path path;
@@ -201,14 +207,14 @@ static int handle_create(const char *nodename, umode_t mode, struct device *dev)
 	if (IS_ERR(dentry))
 		return PTR_ERR(dentry);
 
-	err = vfs_mknod(path.dentry->d_inode,
-			dentry, mode, dev->devt);
+	err = vfs_mknod(path.dentry->d_inode, dentry, mode, dev->devt);
 	if (!err) {
 		struct iattr newattrs;
 
-		/* fixup possibly umasked mode */
 		newattrs.ia_mode = mode;
-		newattrs.ia_valid = ATTR_MODE;
+		newattrs.ia_uid = uid;
+		newattrs.ia_gid = gid;
+		newattrs.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID;
 		mutex_lock(&dentry->d_inode->i_mutex);
 		notify_change(dentry, &newattrs);
 		mutex_unlock(&dentry->d_inode->i_mutex);
@@ -358,10 +364,11 @@ int devtmpfs_mount(const char *mntdir)
 
 static DECLARE_COMPLETION(setup_done);
 
-static int handle(const char *name, umode_t mode, struct device *dev)
+static int handle(const char *name, umode_t mode, kuid_t uid, kgid_t gid,
+		  struct device *dev)
 {
 	if (mode)
-		return handle_create(name, mode, dev);
+		return handle_create(name, mode, uid, gid, dev);
 	else
 		return handle_remove(name, dev);
 }
@@ -387,7 +394,8 @@ static int devtmpfsd(void *p)
 			spin_unlock(&req_lock);
 			while (req) {
 				struct req *next = req->next;
-				req->err = handle(req->name, req->mode, req->dev);
+				req->err = handle(req->name, req->mode,
+						  req->uid, req->gid, req->dev);
 				complete(&req->done);
 				req = next;
 			}

drivers/base/platform.c

@@ -326,9 +326,7 @@ int platform_device_add(struct platform_device *pdev)
 		}
 
 		if (p && insert_resource(p, r)) {
-			printk(KERN_ERR
-			       "%s: failed to claim resource %d\n",
-			       dev_name(&pdev->dev), i);
+			dev_err(&pdev->dev, "failed to claim resource %d\n", i);
 			ret = -EBUSY;
 			goto failed;
 		}
@@ -555,7 +553,8 @@ EXPORT_SYMBOL_GPL(platform_driver_unregister);
 /**
  * platform_driver_probe - register driver for non-hotpluggable device
  * @drv: platform driver structure
- * @probe: the driver probe routine, probably from an __init section
+ * @probe: the driver probe routine, probably from an __init section,
+ *         must not return -EPROBE_DEFER.
  *
  * Use this instead of platform_driver_register() when you know the device
  * is not hotpluggable and has already been registered, and you want to
@@ -566,6 +565,9 @@ EXPORT_SYMBOL_GPL(platform_driver_unregister);
  * into system-on-chip processors, where the controller devices have been
  * configured as part of board setup.
  *
+ * This is incompatible with deferred probing so probe() must not
+ * return -EPROBE_DEFER.
+ *
  * Returns zero if the driver registered and bound to a device, else returns
  * a negative error code and with the driver not registered.
  */
@@ -682,7 +684,7 @@ static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
 	int rc;
 
 	/* Some devices have extra OF data and an OF-style MODALIAS */
-	rc = of_device_uevent_modalias(dev,env);
+	rc = of_device_uevent_modalias(dev, env);
 	if (rc != -ENODEV)
 		return rc;
 
@@ -1126,7 +1128,7 @@ static int __init early_platform_driver_probe_id(char *class_str,
 
 		switch (match_id) {
 		case EARLY_PLATFORM_ID_ERROR:
-			pr_warning("%s: unable to parse %s parameter\n",
+			pr_warn("%s: unable to parse %s parameter\n",
 				class_str, epdrv->pdrv->driver.name);
 			/* fall-through */
 		case EARLY_PLATFORM_ID_UNSET:
@@ -1158,7 +1160,7 @@ static int __init early_platform_driver_probe_id(char *class_str,
 			}
 
 			if (epdrv->pdrv->probe(match))
-				pr_warning("%s: unable to probe %s early.\n",
+				pr_warn("%s: unable to probe %s early.\n",
 					class_str, match->name);
 			else
 				n++;

drivers/usb/core/usb.c

@@ -317,7 +317,8 @@ static const struct dev_pm_ops usb_device_pm_ops = {
 #endif	/* CONFIG_PM */
 
 
-static char *usb_devnode(struct device *dev, umode_t *mode)
+static char *usb_devnode(struct device *dev,
+			 umode_t *mode, kuid_t *uid, kgid_t *gid)
 {
 	struct usb_device *usb_dev;
 

fs/sysfs/dir.c

@@ -165,22 +165,9 @@ struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd)
 	if (unlikely(!sd))
 		return NULL;
 
-	while (1) {
-		int v, t;
-
-		v = atomic_read(&sd->s_active);
-		if (unlikely(v < 0))
-			return NULL;
-
-		t = atomic_cmpxchg(&sd->s_active, v, v + 1);
-		if (likely(t == v))
-			break;
-		if (t < 0)
+	if (!atomic_inc_unless_negative(&sd->s_active))
 		return NULL;
 
-		cpu_relax();
-	}
-
 	if (likely(!ignore_lockdep(sd)))
 		rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_);
 	return sd;
@@ -281,6 +268,10 @@ void release_sysfs_dirent(struct sysfs_dirent * sd)
 	 */
 	parent_sd = sd->s_parent;
 
+	WARN(!(sd->s_flags & SYSFS_FLAG_REMOVED),
+		"sysfs: free using entry: %s/%s\n",
+		parent_sd ? parent_sd->s_name : "", sd->s_name);
+
 	if (sysfs_type(sd) == SYSFS_KOBJ_LINK)
 		sysfs_put(sd->s_symlink.target_sd);
 	if (sysfs_type(sd) & SYSFS_COPY_NAME)
@@ -399,7 +390,7 @@ struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type)
 
 	sd->s_name = name;
 	sd->s_mode = mode;
-	sd->s_flags = type;
+	sd->s_flags = type | SYSFS_FLAG_REMOVED;
 
 	return sd;
 
@@ -479,6 +470,9 @@ int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd)
 		ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME;
 	}
 
+	/* Mark the entry added into directory tree */
+	sd->s_flags &= ~SYSFS_FLAG_REMOVED;
+
 	return 0;
 }
 
@@ -1012,6 +1006,7 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
 	enum kobj_ns_type type;
 	const void *ns;
 	ino_t ino;
+	loff_t off;
 
 	type = sysfs_ns_type(parent_sd);
 	ns = sysfs_info(dentry->d_sb)->ns[type];
@@ -1034,6 +1029,7 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
 			return 0;
 	}
 	mutex_lock(&sysfs_mutex);
+	off = filp->f_pos;
 	for (pos = sysfs_dir_pos(ns, parent_sd, filp->f_pos, pos);
 	     pos;
 	     pos = sysfs_dir_next_pos(ns, parent_sd, filp->f_pos, pos)) {
@@ -1045,19 +1041,24 @@ static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir)
 		len = strlen(name);
 		ino = pos->s_ino;
 		type = dt_type(pos);
-		filp->f_pos = pos->s_hash;
+		off = filp->f_pos = pos->s_hash;
 		filp->private_data = sysfs_get(pos);
 
 		mutex_unlock(&sysfs_mutex);
-		ret = filldir(dirent, name, len, filp->f_pos, ino, type);
+		ret = filldir(dirent, name, len, off, ino, type);
 		mutex_lock(&sysfs_mutex);
 		if (ret < 0)
 			break;
 	}
 	mutex_unlock(&sysfs_mutex);
-	if ((filp->f_pos > 1) && !pos) { /* EOF */
-		filp->f_pos = INT_MAX;
+
+	/* don't reference last entry if its refcount is dropped */
+	if (!pos) {
 		filp->private_data = NULL;
+
+		/* EOF and not changed as 0 or 1 in read/write path */
+		if (off == filp->f_pos && off > 1)
+			filp->f_pos = INT_MAX;
 	}
 	return 0;
 }

include/linux/device.h

@@ -25,6 +25,7 @@
 #include <linux/pm.h>
 #include <linux/atomic.h>
 #include <linux/ratelimit.h>
+#include <linux/uidgid.h>
 #include <asm/device.h>
 
 struct device;
@@ -111,17 +112,11 @@ struct bus_type {
 	struct iommu_ops *iommu_ops;
 
 	struct subsys_private *p;
+	struct lock_class_key lock_key;
 };
 
-/* This is a #define to keep the compiler from merging different
- * instances of the __key variable */
-#define bus_register(subsys)			\
-({						\
-	static struct lock_class_key __key;	\
-	__bus_register(subsys, &__key);	\
-})
-extern int __must_check __bus_register(struct bus_type *bus,
-				       struct lock_class_key *key);
+extern int __must_check bus_register(struct bus_type *bus);
+
 extern void bus_unregister(struct bus_type *bus);
 
 extern int __must_check bus_rescan_devices(struct bus_type *bus);
@@ -471,7 +466,8 @@ struct device_type {
 	const char *name;
 	const struct attribute_group **groups;
 	int (*uevent)(struct device *dev, struct kobj_uevent_env *env);
-	char *(*devnode)(struct device *dev, umode_t *mode);
+	char *(*devnode)(struct device *dev, umode_t *mode,
+			 kuid_t *uid, kgid_t *gid);
 	void (*release)(struct device *dev);
 
 	const struct dev_pm_ops *pm;
@@ -849,7 +845,8 @@ extern int device_rename(struct device *dev, const char *new_name);
 extern int device_move(struct device *dev, struct device *new_parent,
 		       enum dpm_order dpm_order);
 extern const char *device_get_devnode(struct device *dev,
-				      umode_t *mode, const char **tmp);
+				      umode_t *mode, kuid_t *uid, kgid_t *gid,
+				      const char **tmp);
 extern void *dev_get_drvdata(const struct device *dev);
 extern int dev_set_drvdata(struct device *dev, void *data);
 

include/linux/platform_device.h

@@ -20,12 +20,12 @@
 struct mfd_cell;
 
 struct platform_device {
-	const char	* name;
+	const char	*name;
 	int		id;
 	bool		id_auto;
 	struct device	dev;
 	u32		num_resources;
-	struct resource	* resource;
+	struct resource	*resource;
 
 	const struct platform_device_id	*id_entry;
 
@@ -47,9 +47,12 @@ extern struct bus_type platform_bus_type;
 extern struct device platform_bus;
 
 extern void arch_setup_pdev_archdata(struct platform_device *);
-extern struct resource *platform_get_resource(struct platform_device *, unsigned int, unsigned int);
+extern struct resource *platform_get_resource(struct platform_device *,
+					      unsigned int, unsigned int);
 extern int platform_get_irq(struct platform_device *, unsigned int);
-extern struct resource *platform_get_resource_byname(struct platform_device *, unsigned int, const char *);
+extern struct resource *platform_get_resource_byname(struct platform_device *,
+						     unsigned int,
+						     const char *);
 extern int platform_get_irq_byname(struct platform_device *, const char *);
 extern int platform_add_devices(struct platform_device **, int);
 
@@ -161,7 +164,8 @@ extern struct platform_device *platform_device_alloc(const char *name, int id);
 extern int platform_device_add_resources(struct platform_device *pdev,
 					 const struct resource *res,
 					 unsigned int num);
-extern int platform_device_add_data(struct platform_device *pdev, const void *data, size_t size);
+extern int platform_device_add_data(struct platform_device *pdev,
+				    const void *data, size_t size);
 extern int platform_device_add(struct platform_device *pdev);
 extern void platform_device_del(struct platform_device *pdev);
 extern void platform_device_put(struct platform_device *pdev);
@@ -190,7 +194,8 @@ static inline void *platform_get_drvdata(const struct platform_device *pdev)
 	return dev_get_drvdata(&pdev->dev);
 }
 
-static inline void platform_set_drvdata(struct platform_device *pdev, void *data)
+static inline void platform_set_drvdata(struct platform_device *pdev,
+					void *data)
 {
 	dev_set_drvdata(&pdev->dev, data);
 }
@@ -222,8 +227,8 @@ static void __exit __platform_driver##_exit(void) \
 } \
 module_exit(__platform_driver##_exit);
 
-extern struct platform_device *platform_create_bundle(struct platform_driver *driver,
-					int (*probe)(struct platform_device *),
+extern struct platform_device *platform_create_bundle(
+	struct platform_driver *driver, int (*probe)(struct platform_device *),
 	struct resource *res, unsigned int n_res,
 	const void *data, size_t size);