[PATCH] lockdep: annotate i_mutex

Teach special (recursive) locking code to the lock validator.  Has no effect
on non-lockdep kernels.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
index e47e3a8ed6e4..cf11196e012d 100644
--- a/drivers/usb/core/inode.c
+++ b/drivers/usb/core/inode.c
@@ -200,7 +200,7 @@ static void update_sb(struct super_block *sb)
         if (!root)
                 return;
 
-        mutex_lock(&root->d_inode->i_mutex);
+        mutex_lock_nested(&root->d_inode->i_mutex, I_MUTEX_PARENT);
 
         list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) {
                 if (bus->d_inode) {