[PATCH] lockdep: use mutex_lock_nested for bd_mutex to avoid lockdep warning
Now that the nesting in blkdev_{get,put} is simpler, adding mutex_lock_nested is trivial. Cc: Ingo Molnar <mingo@elte.hu> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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