kfifo: fix kfifo_out_locked race bug
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>
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@ -228,13 +228,6 @@ static inline __must_check unsigned int kfifo_out_locked(struct kfifo *fifo,
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ret = kfifo_out(fifo, to, n);
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/*
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* optimization: if the FIFO is empty, set the indices to 0
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* so we don't wrap the next time
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*/
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if (kfifo_is_empty(fifo))
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kfifo_reset(fifo);
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spin_unlock_irqrestore(lock, flags);
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return ret;
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