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ARM: dma-mapping: free allocated page if unable to map

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If the attempt to map a page for DMA fails (eg, because we're out of
mapping space) then we must not hold on to the page we allocated for
DMA - doing so will result in a memory leak.

Cc: <stable@kernel.org>
Reported-by: Bryan Phillippe <bp@darkforest.org>
Tested-by: Bryan Phillippe <bp@darkforest.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2011-09-22 10:32:25 +01:00
parent 6760b10960
commit d8e89b47e0
1 changed files with 2 additions and 0 deletions
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2
arch/arm/mm/dma-mapping.c
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@ -324,6 +324,8 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
if (addr)
*handle = pfn_to_dma(dev, page_to_pfn(page));
else
__dma_free_buffer(page, size);
return addr;
}