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dma-mapping: introduce a dma_common_find_pages helper

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A helper to find the backing page array based on a virtual address.
This also ensures we do the same vm_flags check everywhere instead
of slightly different or missing ones in a few places.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig
2019-06-03 09:14:31 +02:00
parent 512317401f
commit 5cf4537975
4 changed files with 16 additions and 20 deletions
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7
arch/arm/mm/dma-mapping.c
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@@ -1439,18 +1439,13 @@ static struct page **__atomic_get_pages(void *addr)
static struct page **__iommu_get_pages(void *cpu_addr, unsigned long attrs)
{
struct vm_struct *area;
if (__in_atomic_pool(cpu_addr, PAGE_SIZE))
return __atomic_get_pages(cpu_addr);
if (attrs & DMA_ATTR_NO_KERNEL_MAPPING)
return cpu_addr;
area = find_vm_area(cpu_addr);
if (area && (area->flags & VM_DMA_COHERENT))
return area->pages;
return NULL;
return dma_common_find_pages(cpu_addr);
}
static void *__iommu_alloc_simple(struct device *dev, size_t size, gfp_t gfp,