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kfifo: fix kfifo_alloc() and kfifo_init() 

Fix kfifo_alloc() and kfifo_init() to alloc at least the requested number
of elements.  Since the kfifo operates on power of 2 the request size will
be rounded up to the next power of two.

Signed-off-by: Stefani Seibold <stefani@seibold.net>
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 2013-02-27 17:05:51 -08:00 committed by Linus Torvalds
parent c759b35e64
commit dfe2a77fd2
1 changed files with 2 additions and 4 deletions
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6
lib/kfifo.c
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@ -42,8 +42,7 @@ int __kfifo_alloc(struct __kfifo *fifo, unsigned int size,
* round down to the next power of 2, since our 'let the indices * round down to the next power of 2, since our 'let the indices
* wrap' technique works only in this case. * wrap' technique works only in this case.
*/ */
if (!is_power_of_2(size)) size = roundup_pow_of_two(size);
size = rounddown_pow_of_two(size);
fifo->in = 0; fifo->in = 0;
fifo->out = 0; fifo->out = 0;
@ -83,8 +82,7 @@ int __kfifo_init(struct __kfifo *fifo, void *buffer,
{ {
size /= esize; size /= esize;
if (!is_power_of_2(size)) size = roundup_pow_of_two(size);
size = rounddown_pow_of_two(size);
fifo->in = 0; fifo->in = 0;
fifo->out = 0; fifo->out = 0;