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ARM: dma-mapping: fix nommu dma_alloc_coherent()

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The nommu version of dma_alloc_coherent was using kmalloc/kfree to manage
the memory.  dma_alloc_coherent() is expected to work with a granularity
of a page, so this is wrong.  Fix it by using the helper functions now
provided.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Greg Ungerer <gerg@uclinux.org>
This commit is contained in:
Russell King 2009-11-19 15:54:45 +00:00
parent 3e82d012e9
commit 04da56943b
1 changed files with 10 additions and 17 deletions
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27
arch/arm/mm/dma-mapping.c
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@ -212,24 +212,17 @@ static void *
__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp,
pgprot_t prot)
{
void *virt;
u64 mask = get_coherent_dma_mask(dev);
struct page *page;
if (!mask)
goto error;
if (mask < 0xffffffffULL)
gfp |= GFP_DMA;
virt = kmalloc(size, gfp);
if (!virt)
goto error;
*handle = virt_to_dma(dev, virt);
return virt;
error:
*handle = ~0;
return NULL;
size = PAGE_ALIGN(size);
page = __dma_alloc_buffer(dev, size, gfp);
if (!page)
return NULL;
*handle = page_to_dma(dev, page);
return page_address(page);
}
#endif /* CONFIG_MMU */
@ -406,7 +399,7 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr
{
if (dma_release_from_coherent(dev, get_order(size), cpu_addr))
return;
kfree(cpu_addr);
__dma_free_buffer(dma_to_page(dev, handle), PAGE_ALIGN(size));
}
#endif /* CONFIG_MMU */
EXPORT_SYMBOL(dma_free_coherent);