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Subject[PATCH] swiotlb: Fix uninitialized pointer on DMA ops
Date
The mmap function pointer on swiotlb_dma_ops struct is
uninitialized, which causes a random crash when calling
the dma_mmap_coherent function on platforms where no DMA
address translation hardware is available.

Set this pointer to NULL in order to fix the issue.

Signed-off-by: Esteban Zamora <estebanzacr.20@gmail.com>
---
kernel/dma/swiotlb.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 4f8a6db..9a7718c 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -1082,5 +1082,6 @@ const struct dma_map_ops swiotlb_dma_ops = {
.map_page = swiotlb_map_page,
.unmap_page = swiotlb_unmap_page,
.dma_supported = dma_direct_supported,
+ .mmap = NULL,
};
EXPORT_SYMBOL(swiotlb_dma_ops);
--
2.7.4
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