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kfifo: fix kfifo_out_locked race bug

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Fix a wrong optimization in include/linux/kfifo.h which could cause a race
in kfifo_out_locked.

Signed-off-by: Stefani Seibold <stefani@seibold.net>
Reported-by: Johan Hovold <jhovold@gmail.com>
Cc: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stefani Seibold 2010-01-15 17:01:02 -08:00 committed by Linus Torvalds
parent 33f724eb9e
commit 7e105057a3
1 changed files with 0 additions and 7 deletions
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7
include/linux/kfifo.h
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@ -228,13 +228,6 @@ static inline __must_check unsigned int kfifo_out_locked(struct kfifo *fifo,
ret = kfifo_out(fifo, to, n);
/*
* optimization: if the FIFO is empty, set the indices to 0
* so we don't wrap the next time
*/
if (kfifo_is_empty(fifo))
kfifo_reset(fifo);
spin_unlock_irqrestore(lock, flags);
return ret;