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-rw-r--r--arch/arm/mm/dma-mapping.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 882eacc6ebc1..54b158df5afa 100644
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -1136,10 +1136,22 @@ static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t si
return 0;
}
+static struct page **__atomic_get_pages(void *addr)
+{
+ struct dma_pool *pool = &atomic_pool;
+ struct page **pages = pool->pages;
+ int offs = (addr - pool->vaddr) >> PAGE_SHIFT;
+
+ return pages + offs;
+}
+
static struct page **__iommu_get_pages(void *cpu_addr, struct dma_attrs *attrs)
{
struct vm_struct *area;
+ if (__in_atomic_pool(cpu_addr, PAGE_SIZE))
+ return __atomic_get_pages(cpu_addr);
+
if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs))
return cpu_addr;
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