[PATCHv2 1/2] arm64: Check for NULL device before getting the coherent_dma_mask

[lauraa@codeaurora.org (Laura Abbott)]

The device passed in to dma_alloc may be NULL. Check for this before
trying to get the coherent_dma_mask.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Laura Abbott <lauraa@codeaurora.org>
---
 arch/arm64/mm/dma-mapping.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 4bd7579..4134212 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -33,7 +33,7 @@ static void *arm64_swiotlb_alloc_coherent(struct device *dev, size_t size,
 					  dma_addr_t *dma_handle, gfp_t flags,
 					  struct dma_attrs *attrs)
 {
-	if (IS_ENABLED(CONFIG_ZONE_DMA32) &&
+	if (dev && IS_ENABLED(CONFIG_ZONE_DMA32) &&
 	    dev->coherent_dma_mask <= DMA_BIT_MASK(32))
 		flags |= GFP_DMA32;
 	return swiotlb_alloc_coherent(dev, size, dma_handle, flags);
-- 
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