class: change internal semaphore to a mutex
Now that the lockdep infrastructure in the class core is in place, we
should be able to properly change the internal class semaphore to be a
mutex.
David wrote the original patch, and Greg fixed it up to apply properly
due to all of the recent changes in this area.
From: Dave Young <hidave.darkstar@gmail.com>
Cc: Matthew Wilcox <matthew@wil.cx>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/base/core.c b/drivers/base/core.c
index b90ae6f..c05b115 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -21,6 +21,7 @@
#include <linux/genhd.h>
#include <linux/kallsyms.h>
#include <linux/semaphore.h>
+#include <linux/mutex.h>
#include "base.h"
#include "power/power.h"
@@ -907,7 +908,7 @@
klist_add_tail(&dev->knode_parent, &parent->klist_children);
if (dev->class) {
- down(&dev->class->p->class_sem);
+ mutex_lock(&dev->class->p->class_mutex);
/* tie the class to the device */
list_add_tail(&dev->node, &dev->class->p->class_devices);
@@ -916,7 +917,7 @@
&dev->class->p->class_interfaces, node)
if (class_intf->add_dev)
class_intf->add_dev(dev, class_intf);
- up(&dev->class->p->class_sem);
+ mutex_unlock(&dev->class->p->class_mutex);
}
Done:
put_device(dev);
@@ -1017,7 +1018,7 @@
if (dev->class) {
device_remove_class_symlinks(dev);
- down(&dev->class->p->class_sem);
+ mutex_lock(&dev->class->p->class_mutex);
/* notify any interfaces that the device is now gone */
list_for_each_entry(class_intf,
&dev->class->p->class_interfaces, node)
@@ -1025,7 +1026,7 @@
class_intf->remove_dev(dev, class_intf);
/* remove the device from the class list */
list_del_init(&dev->node);
- up(&dev->class->p->class_sem);
+ mutex_unlock(&dev->class->p->class_mutex);
}
device_remove_file(dev, &uevent_attr);
device_remove_attrs(dev);