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sh: split coherent pages 

Split pages returned by dma_alloc_coherent() and make sure
we free them one by one.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2008-12-17 17:18:45 +09:00 committed by Paul Mundt
parent 78fb40263f
commit da9fdc8b44
1 changed files with 6 additions and 1 deletions
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7
arch/sh/mm/consistent.c
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@ -42,6 +42,8 @@ void *dma_alloc_coherent(struct device *dev, size_t size,
return NULL; return NULL;
} }
split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
*dma_handle = virt_to_phys(ret); *dma_handle = virt_to_phys(ret);
return ret_nocache; return ret_nocache;
} }
@ -51,10 +53,13 @@ void dma_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle) void *vaddr, dma_addr_t dma_handle)
{ {
int order = get_order(size); int order = get_order(size);
unsigned long pfn = dma_handle >> PAGE_SHIFT;
int k;
if (!dma_release_from_coherent(dev, order, vaddr)) { if (!dma_release_from_coherent(dev, order, vaddr)) {
WARN_ON(irqs_disabled()); /* for portability */ WARN_ON(irqs_disabled()); /* for portability */
free_pages((unsigned long)phys_to_virt(dma_handle), order); for (k = 0; k < (1 << order); k++)
__free_pages(pfn_to_page(pfn + k), 0);
iounmap(vaddr); iounmap(vaddr);
} }
} }