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authorDave Young <hidave.darkstar@gmail.com>2008-05-28 09:28:39 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2008-07-21 21:54:52 -0700
commitf75b1c60fc1e53c4004a79ea0be071aa3318cdcc (patch)
tree75728a6393f2e7568cd17ffd749fd3c4a4e1d95f /drivers/base/core.c
parentd2a3b9146e4f40c2e872d7567c996ef95083d802 (diff)
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>
Diffstat (limited to 'drivers/base/core.c')
-rw-r--r--drivers/base/core.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index b90ae6f7be86..c05b1159023e 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 @@ int device_add(struct device *dev)
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 @@ int device_add(struct device *dev)
&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 @@ void device_del(struct device *dev)
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 @@ void device_del(struct device *dev)
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);