Merge branch 'perf/core' into perf/uprobes

Merge in latest upstream (and the latest perf development tree),
to prepare for tooling changes, and also to pick up v3.4 MM
changes that the uprobes code needs to take care of.

Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 5 insertions, 60 deletions

diff --git a/drivers/base/driver.c b/drivers/base/driver.c
index b631f7c5945..3ec3896c83a 100644
--- a/drivers/base/driver.c
+++ b/drivers/base/driver.c
@@ -123,64 +123,6 @@ void driver_remove_file(struct device_driver *drv,
 }
 EXPORT_SYMBOL_GPL(driver_remove_file);
 
-/**
- * driver_add_kobj - add a kobject below the specified driver
- * @drv: requesting device driver
- * @kobj: kobject to add below this driver
- * @fmt: format string that names the kobject
- *
- * You really don't want to do this, this is only here due to one looney
- * iseries driver, go poke those developers if you are annoyed about
- * this...
- */
-int driver_add_kobj(struct device_driver *drv, struct kobject *kobj,
-		    const char *fmt, ...)
-{
-	va_list args;
-	char *name;
-	int ret;
-
-	va_start(args, fmt);
-	name = kvasprintf(GFP_KERNEL, fmt, args);
-	va_end(args);
-
-	if (!name)
-		return -ENOMEM;
-
-	ret = kobject_add(kobj, &drv->p->kobj, "%s", name);
-	kfree(name);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(driver_add_kobj);
-
-/**
- * get_driver - increment driver reference count.
- * @drv: driver.
- */
-struct device_driver *get_driver(struct device_driver *drv)
-{
-	if (drv) {
-		struct driver_private *priv;
-		struct kobject *kobj;
-
-		kobj = kobject_get(&drv->p->kobj);
-		priv = to_driver(kobj);
-		return priv->driver;
-	}
-	return NULL;
-}
-EXPORT_SYMBOL_GPL(get_driver);
-
-/**
- * put_driver - decrement driver's refcount.
- * @drv: driver.
- */
-void put_driver(struct device_driver *drv)
-{
-	kobject_put(&drv->p->kobj);
-}
-EXPORT_SYMBOL_GPL(put_driver);
-
 static int driver_add_groups(struct device_driver *drv,
 			     const struct attribute_group **groups)
 {
@@ -234,7 +176,6 @@ int driver_register(struct device_driver *drv)
 
 	other = driver_find(drv->name, drv->bus);
 	if (other) {
-		put_driver(other);
 		printk(KERN_ERR "Error: Driver '%s' is already registered, "
 			"aborting...\n", drv->name);
 		return -EBUSY;
@@ -275,7 +216,9 @@ EXPORT_SYMBOL_GPL(driver_unregister);
  * Call kset_find_obj() to iterate over list of drivers on
  * a bus to find driver by name. Return driver if found.
  *
- * Note that kset_find_obj increments driver's reference count.
+ * This routine provides no locking to prevent the driver it returns
+ * from being unregistered or unloaded while the caller is using it.
+ * The caller is responsible for preventing this.
  */
 struct device_driver *driver_find(const char *name, struct bus_type *bus)
 {
@@ -283,6 +226,8 @@ struct device_driver *driver_find(const char *name, struct bus_type *bus)
 	struct driver_private *priv;
 
 	if (k) {
+		/* Drop reference added by kset_find_obj() */
+		kobject_put(k);
 		priv = to_driver(k);
 		return priv->driver;
 	}