Merge branch 'quilt/driver-core'

17 files changed, 59 insertions, 42 deletions

diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index fd52c48ee762..ef38aff737eb 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -18,9 +18,9 @@ config UEVENT_HELPER_PATH
 
 config DEVTMPFS
 	bool "Maintain a devtmpfs filesystem to mount at /dev"
-	depends on HOTPLUG && SHMEM && TMPFS
+	depends on HOTPLUG
 	help
-	  This creates a tmpfs filesystem instance early at bootup.
+	  This creates a tmpfs/ramfs filesystem instance early at bootup.
 	  In this filesystem, the kernel driver core maintains device
 	  nodes with their default names and permissions for all
 	  registered devices with an assigned major/minor number.
@@ -33,6 +33,9 @@ config DEVTMPFS
 	  functional /dev without any further help. It also allows simple
 	  rescue systems, and reliably handles dynamic major/minor numbers.
 
+	  Notice: if CONFIG_TMPFS isn't enabled, the simpler ramfs
+	  file system will be used instead.
+
 config DEVTMPFS_MOUNT
 	bool "Automount devtmpfs at /dev, after the kernel mounted the rootfs"
 	depends on DEVTMPFS
diff --git a/drivers/base/core.c b/drivers/base/core.c
index b56a0ba31d4a..cf507a7d200c 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -20,7 +20,6 @@
 #include <linux/notifier.h>
 #include <linux/genhd.h>
 #include <linux/kallsyms.h>
-#include <linux/semaphore.h>
 #include <linux/mutex.h>
 #include <linux/async.h>
 
@@ -559,10 +558,9 @@ void device_initialize(struct device *dev)
 	dev->kobj.kset = devices_kset;
 	kobject_init(&dev->kobj, &device_ktype);
 	INIT_LIST_HEAD(&dev->dma_pools);
-	init_MUTEX(&dev->sem);
+	mutex_init(&dev->mutex);
 	spin_lock_init(&dev->devres_lock);
 	INIT_LIST_HEAD(&dev->devres_head);
-	device_init_wakeup(dev, 0);
 	device_pm_init(dev);
 	set_dev_node(dev, -1);
 }
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index c89291f8a16b..503c2620bbcc 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -40,11 +40,11 @@ static void driver_bound(struct device *dev)
 	pr_debug("driver: '%s': %s: bound to device '%s'\n", dev_name(dev),
 		 __func__, dev->driver->name);
 
+	klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices);
+
 	if (dev->bus)
 		blocking_notifier_call_chain(&dev->bus->p->bus_notifier,
 					     BUS_NOTIFY_BOUND_DRIVER, dev);
-
-	klist_add_tail(&dev->p->knode_driver, &dev->driver->p->klist_devices);
 }
 
 static int driver_sysfs_add(struct device *dev)
diff --git a/drivers/base/devtmpfs.c b/drivers/base/devtmpfs.c
index dac478c6e460..6927262c7710 100644
--- a/drivers/base/devtmpfs.c
+++ b/drivers/base/devtmpfs.c
@@ -20,6 +20,7 @@
 #include <linux/namei.h>
 #include <linux/fs.h>
 #include <linux/shmem_fs.h>
+#include <linux/ramfs.h>
 #include <linux/cred.h>
 #include <linux/sched.h>
 #include <linux/init_task.h>
@@ -44,7 +45,11 @@ __setup("devtmpfs.mount=", mount_param);
 static int dev_get_sb(struct file_system_type *fs_type, int flags,
 		      const char *dev_name, void *data, struct vfsmount *mnt)
 {
+#ifdef CONFIG_TMPFS
 	return get_sb_single(fs_type, flags, data, shmem_fill_super, mnt);
+#else
+	return get_sb_single(fs_type, flags, data, ramfs_fill_super, mnt);
+#endif
 }
 
 static struct file_system_type dev_fs_type = {
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index 18518ba13c81..a897000655eb 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -492,15 +492,14 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
 	     builtin++) {
 		if (strcmp(name, builtin->name))
 			continue;
-		dev_info(device, "firmware: using built-in firmware %s\n",
-			 name);
+		dev_dbg(device, "firmware: using built-in firmware %s\n", name);
 		firmware->size = builtin->size;
 		firmware->data = builtin->data;
 		return 0;
 	}
 
 	if (uevent)
-		dev_info(device, "firmware: requesting %s\n", name);
+		dev_dbg(device, "firmware: requesting %s\n", name);
 
 	retval = fw_setup_device(firmware, &f_dev, name, device, uevent);
 	if (retval)
diff --git a/drivers/base/module.c b/drivers/base/module.c
index 103be9cacb05..51c1fb6b947f 100644
--- a/drivers/base/module.c
+++ b/drivers/base/module.c
@@ -14,12 +14,10 @@ static char *make_driver_name(struct device_driver *drv)
 {
 	char *driver_name;
 
-	driver_name = kmalloc(strlen(drv->name) + strlen(drv->bus->name) + 2,
-			      GFP_KERNEL);
+	driver_name = kasprintf(GFP_KERNEL, "%s:%s", drv->bus->name, drv->name);
 	if (!driver_name)
 		return NULL;
 
-	sprintf(driver_name, "%s:%s", drv->bus->name, drv->name);
 	return driver_name;
 }
 
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 4b4b565c835f..43479a9a9c3b 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -735,7 +735,7 @@ static void platform_pm_complete(struct device *dev)
 
 #ifdef CONFIG_SUSPEND
 
-static int platform_pm_suspend(struct device *dev)
+int __weak platform_pm_suspend(struct device *dev)
 {
 	struct device_driver *drv = dev->driver;
 	int ret = 0;
@@ -753,7 +753,7 @@ static int platform_pm_suspend(struct device *dev)
 	return ret;
 }
 
-static int platform_pm_suspend_noirq(struct device *dev)
+int __weak platform_pm_suspend_noirq(struct device *dev)
 {
 	struct device_driver *drv = dev->driver;
 	int ret = 0;
@@ -769,7 +769,7 @@ static int platform_pm_suspend_noirq(struct device *dev)
 	return ret;
 }
 
-static int platform_pm_resume(struct device *dev)
+int __weak platform_pm_resume(struct device *dev)
 {
 	struct device_driver *drv = dev->driver;
 	int ret = 0;
@@ -787,7 +787,7 @@ static int platform_pm_resume(struct device *dev)
 	return ret;
 }
 
-static int platform_pm_resume_noirq(struct device *dev)
+int __weak platform_pm_resume_noirq(struct device *dev)
 {
 	struct device_driver *drv = dev->driver;
 	int ret = 0;
@@ -1254,6 +1254,25 @@ static int __init early_platform_driver_probe_id(char *class_str,
 		}
 
 		if (match) {
+			/*
+			 * Set up a sensible init_name to enable
+			 * dev_name() and others to be used before the
+			 * rest of the driver core is initialized.
+			 */
+			if (!match->dev.init_name) {
+				char buf[32];
+
+				if (match->id != -1)
+					snprintf(buf, sizeof(buf), "%s.%d",
+						 match->name, match->id);
+				else
+					snprintf(buf, sizeof(buf), "%s",
+						 match->name);
+
+				match->dev.init_name = kstrdup(buf, GFP_KERNEL);
+				if (!match->dev.init_name)
+					return -ENOMEM;
+			}
 			if (epdrv->pdrv->probe(match))
 				pr_warning("%s: unable to probe %s early.\n",
 					   class_str, match->name);
diff --git a/drivers/net/mlx4/mlx4.h b/drivers/net/mlx4/mlx4.h
index bc72d6e4919b..13343e884999 100644
--- a/drivers/net/mlx4/mlx4.h
+++ b/drivers/net/mlx4/mlx4.h
@@ -40,6 +40,7 @@
 #include <linux/mutex.h>
 #include <linux/radix-tree.h>
 #include <linux/timer.h>
+#include <linux/semaphore.h>
 #include <linux/workqueue.h>
 
 #include <linux/mlx4/device.h>
diff --git a/drivers/staging/comedi/drivers/quatech_daqp_cs.c b/drivers/staging/comedi/drivers/quatech_daqp_cs.c
index 3325f24448b5..c144314e973f 100644
--- a/drivers/staging/comedi/drivers/quatech_daqp_cs.c
+++ b/drivers/staging/comedi/drivers/quatech_daqp_cs.c
@@ -48,6 +48,7 @@ Devices: [Quatech] DAQP-208 (daqp), DAQP-308
 */
 
 #include "../comedidev.h"
+#include <linux/semaphore.h>
 
 #include <pcmcia/cs_types.h>
 #include <pcmcia/cs.h>
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 1297e9b16a51..0c6581003339 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -573,7 +573,7 @@ int usb_lock_device_for_reset(struct usb_device *udev,
 			iface->condition == USB_INTERFACE_UNBOUND))
 		return -EINTR;
 
-	while (usb_trylock_device(udev) != 0) {
+	while (!usb_trylock_device(udev)) {
 
 		/* If we can't acquire the lock after waiting one second,
 		 * we're probably deadlocked */
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index a6090aa1a7c1..1a5259a12ba0 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -213,7 +213,7 @@ static int ramfs_parse_options(char *data, struct ramfs_mount_opts *opts)
 	return 0;
 }
 
-static int ramfs_fill_super(struct super_block * sb, void * data, int silent)
+int ramfs_fill_super(struct super_block *sb, void *data, int silent)
 {
 	struct ramfs_fs_info *fsi;
 	struct inode *inode = NULL;
diff --git a/include/linux/device.h b/include/linux/device.h
index 182192892d45..6f9619190aaf 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -22,7 +22,6 @@
 #include <linux/types.h>
 #include <linux/module.h>
 #include <linux/pm.h>
-#include <linux/semaphore.h>
 #include <asm/atomic.h>
 #include <asm/device.h>
 
@@ -404,7 +403,7 @@ struct device {
 	const char		*init_name; /* initial name of the device */
 	struct device_type	*type;
 
-	struct semaphore	sem;	/* semaphore to synchronize calls to
+	struct mutex		mutex;	/* mutex to synchronize calls to
 					 * its driver.
 					 */
 
@@ -451,6 +450,10 @@ struct device {
 
 static inline const char *dev_name(const struct device *dev)
 {
+	/* Use the init name until the kobject becomes available */
+	if (dev->init_name)
+		return dev->init_name;
+
 	return kobject_name(&dev->kobj);
 }
 
@@ -510,17 +513,17 @@ static inline bool device_async_suspend_enabled(struct device *dev)
 
 static inline void device_lock(struct device *dev)
 {
-	down(&dev->sem);
+	mutex_lock(&dev->mutex);
 }
 
 static inline int device_trylock(struct device *dev)
 {
-	return down_trylock(&dev->sem);
+	return mutex_trylock(&dev->mutex);
 }
 
 static inline void device_unlock(struct device *dev)
 {
-	up(&dev->sem);
+	mutex_unlock(&dev->mutex);
 }
 
 void driver_init(void);
diff --git a/include/linux/kref.h b/include/linux/kref.h
index baf4b9e4b194..6cc38fc07ab7 100644
--- a/include/linux/kref.h
+++ b/include/linux/kref.h
@@ -21,7 +21,6 @@ struct kref {
 	atomic_t refcount;
 };
 
-void kref_set(struct kref *kref, int num);
 void kref_init(struct kref *kref);
 void kref_get(struct kref *kref);
 int kref_put(struct kref *kref, void (*release) (struct kref *kref));
diff --git a/include/linux/ramfs.h b/include/linux/ramfs.h
index 4e768dda87b0..8600508c77a6 100644
--- a/include/linux/ramfs.h
+++ b/include/linux/ramfs.h
@@ -20,4 +20,6 @@ extern const struct file_operations ramfs_file_operations;
 extern const struct vm_operations_struct generic_file_vm_ops;
 extern int __init init_rootfs(void);
 
+int ramfs_fill_super(struct super_block *sb, void *data, int silent);
+
 #endif
diff --git a/kernel/user_namespace.c b/kernel/user_namespace.c
index 076c7c8215b0..b2d70d38dff4 100644
--- a/kernel/user_namespace.c
+++ b/kernel/user_namespace.c
@@ -54,8 +54,8 @@ int create_user_ns(struct cred *new)
 #endif
 	/* tgcred will be cleared in our caller bc CLONE_THREAD won't be set */
 
-	/* alloc_uid() incremented the userns refcount.  Just set it to 1 */
-	kref_set(&ns->kref, 1);
+	/* root_user holds a reference to ns, our reference can be dropped */
+	put_user_ns(ns);
 
 	return 0;
 }
diff --git a/lib/kref.c b/lib/kref.c
index 9ecd6e865610..69761d3de203 100644
--- a/lib/kref.c
+++ b/lib/kref.c
@@ -15,23 +15,13 @@
 #include <linux/module.h>
 
 /**
- * kref_set - initialize object and set refcount to requested number.
- * @kref: object in question.
- * @num: initial reference counter
- */
-void kref_set(struct kref *kref, int num)
-{
-	atomic_set(&kref->refcount, num);
-	smp_mb();
-}
-
-/**
  * kref_init - initialize object.
  * @kref: object in question.
  */
 void kref_init(struct kref *kref)
 {
-	kref_set(kref, 1);
+	atomic_set(&kref->refcount, 1);
+	smp_mb();
 }
 
 /**
@@ -71,7 +61,6 @@ int kref_put(struct kref *kref, void (*release)(struct kref *kref))
 	return 0;
 }
 
-EXPORT_SYMBOL(kref_set);
 EXPORT_SYMBOL(kref_init);
 EXPORT_SYMBOL(kref_get);
 EXPORT_SYMBOL(kref_put);
diff --git a/security/integrity/ima/ima_iint.c b/security/integrity/ima/ima_iint.c
index 6cc22430cb44..01ddf314601e 100644
--- a/security/integrity/ima/ima_iint.c
+++ b/security/integrity/ima/ima_iint.c
@@ -93,7 +93,7 @@ void iint_free(struct kref *kref)
 		       iint->opencount);
 		iint->opencount = 0;
 	}
-	kref_set(&iint->refcount, 1);
+	kref_init(&iint->refcount);
 	kmem_cache_free(iint_cache, iint);
 }
 
@@ -132,7 +132,7 @@ static void init_once(void *foo)
 	iint->readcount = 0;
 	iint->writecount = 0;
 	iint->opencount = 0;
-	kref_set(&iint->refcount, 1);
+	kref_init(&iint->refcount);
 }
 
 static int __init ima_iintcache_init(void)