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printk: Fix rq->lock vs logbuf_lock unlock lock inversion

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commit dbda92d16f upstream.

commit 07354eb1a7 ("locking printk: Annotate logbuf_lock as raw")
reintroduced a lock inversion problem which was fixed in commit
0b5e1c5255 ("printk: Release console_sem after logbuf_lock"). This
happened probably when fixing up patch rejects.

Restore the ordering and unlock logbuf_lock before releasing
console_sem.

Signed-off-by: ybu <ybu@qti.qualcomm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/E807E903FE6CBE4D95E420FBFCC273B827413C@nasanexd01h.na.qualcomm.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bu, Yitian 2013-02-18 12:53:37 +00:00 committed by Greg Kroah-Hartman
parent bcaef288b2
commit 5df5df87f2
1 changed files with 1 additions and 1 deletions
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2
kernel/printk.c
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@ -1369,9 +1369,9 @@ static int console_trylock_for_printk(unsigned int cpu)
}
}
logbuf_cpu = UINT_MAX;
raw_spin_unlock(&logbuf_lock);
if (wake)
up(&console_sem);
raw_spin_unlock(&logbuf_lock);
return retval;
}