diff options
author | NeilBrown <neilb@suse.de> | 2006-12-08 11:36:17 +0100 |
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committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-08 17:28:39 +0100 |
commit | d63a5a74dee87883fda6b7d170244acaac5b05e8 (patch) | |
tree | 8b12bc626b8f1507b7b550865c5f8282bcac6c27 /kernel/mutex.c | |
parent | [PATCH] lockdep: use mutex_lock_nested for bd_mutex to avoid lockdep warning (diff) | |
download | linux-d63a5a74dee87883fda6b7d170244acaac5b05e8.tar.xz linux-d63a5a74dee87883fda6b7d170244acaac5b05e8.zip |
[PATCH] lockdep: avoid lockdep warning in md
md_open takes ->reconfig_mutex which causes lockdep to complain. This
(normally) doesn't have deadlock potential as the possible conflict is with a
reconfig_mutex in a different device.
I say "normally" because if a loop were created in the array->member hierarchy
a deadlock could happen. However that causes bigger problems than a deadlock
and should be fixed independently.
So we flag the lock in md_open as a nested lock. This requires defining
mutex_lock_interruptible_nested.
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to '')
-rw-r--r-- | kernel/mutex.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/mutex.c b/kernel/mutex.c index 8c71cf72a497..e7cbbb82765b 100644 --- a/kernel/mutex.c +++ b/kernel/mutex.c @@ -206,6 +206,15 @@ mutex_lock_nested(struct mutex *lock, unsigned int subclass) } EXPORT_SYMBOL_GPL(mutex_lock_nested); + +int __sched +mutex_lock_interruptible_nested(struct mutex *lock, unsigned int subclass) +{ + might_sleep(); + return __mutex_lock_common(lock, TASK_INTERRUPTIBLE, subclass); +} + +EXPORT_SYMBOL_GPL(mutex_lock_interruptible_nested); #endif /* |