diff options
| -rw-r--r-- | arch/arm64/mm/dma-mapping.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index 4bd7579ec9e6..83e643131e10 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -33,6 +33,11 @@ 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 (dev == NULL) { + WARN_ONCE(1, "Use an actual device structure for DMA allocation\n"); + return NULL; + } + if (IS_ENABLED(CONFIG_ZONE_DMA32) && dev->coherent_dma_mask <= DMA_BIT_MASK(32)) flags |= GFP_DMA32; @@ -43,6 +48,11 @@ static void arm64_swiotlb_free_coherent(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle, struct dma_attrs *attrs) { + if (dev == NULL) { + WARN_ONCE(1, "Use an actual device structure for DMA allocation\n"); + return; + } + swiotlb_free_coherent(dev, size, vaddr, dma_handle); } |