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dmapool: Validate parameters to dma_pool_create 

Check that 'align' is a power of two, like the API specifies.
Align 'size' to 'align' correctly -- the current code has an off-by-one.
The ALIGN macro in kernel.h doesn't.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Acked-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Matthew Wilcox 2007-12-03 12:10:24 -05:00
parent 2cae367e48
commit 399154be2d
1 changed files with 8 additions and 7 deletions
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15
mm/dmapool.c
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@ -106,16 +106,17 @@ struct dma_pool *dma_pool_create(const char *name, struct device *dev,
{
struct dma_pool *retval;
if (align == 0)
if (align == 0) {
align = 1;
} else if (align & (align - 1)) {
return NULL;
}
if (size == 0)
return NULL;
else if (size < align)
size = align;
else if ((size % align) != 0) {
size += align + 1;
size &= ~(align - 1);
}
if ((size % align) != 0)
size = ALIGN(size, align);
if (allocation == 0) {
if (PAGE_SIZE < size)