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kfifo: fix kfifo_alloc() and kfifo_init()

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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 <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Stefani Seibold authored and Linus Torvalds committed 2013-02-27 19:10:23 -08:00
1 parent c759b35e64
commit dfe2a77fd2
1 file changed
+2 -4
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lib/kfifo.c
+2 -4
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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
* wrap' technique works only in this case.
*/
if (!is_power_of_2(size))
size = rounddown_pow_of_two(size);
size = roundup_pow_of_two(size);
fifo->in = 0;
fifo->out = 0;
@@ -83,8 +82,7 @@ int __kfifo_init(struct __kfifo *fifo, void *buffer,
{
size /= esize;
if (!is_power_of_2(size))
size = rounddown_pow_of_two(size);
size = roundup_pow_of_two(size);
fifo->in = 0;
fifo->out = 0;