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lockdep: Fix lockdep annotation for pipe_double_lock() 

The presumed use of the pipe_double_lock() routine is to lock 2 locks in
a deadlock free way by ordering the locks by their address. However it
fails to keep the specified lock classes in order and explicitly
annotates a deadlock.

Rectify this.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Miklos Szeredi <mszeredi@suse.cz>
LKML-Reference: <1248163763.15751.11098.camel@twins>
This commit is contained in:
Peter Zijlstra 2009-07-21 10:09:23 +02:00 committed by Peter Zijlstra
parent aea1f7964a
commit 023d43c7b5
1 changed files with 2 additions and 2 deletions
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4
fs/pipe.c
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@ -68,8 +68,8 @@ void pipe_double_lock(struct pipe_inode_info *pipe1,
pipe_lock_nested(pipe1, I_MUTEX_PARENT);
pipe_lock_nested(pipe2, I_MUTEX_CHILD);
} else {
pipe_lock_nested(pipe2, I_MUTEX_CHILD);
pipe_lock_nested(pipe1, I_MUTEX_PARENT);
pipe_lock_nested(pipe2, I_MUTEX_PARENT);
pipe_lock_nested(pipe1, I_MUTEX_CHILD);
}
}