From: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/media/video/videobuf2-dma-contig.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/media/video/videobuf2-dma-contig.c b/drivers/media/video/videobuf2-dma-contig.c
index d44766e..11f4a46 100644
--- a/drivers/media/video/videobuf2-dma-contig.c
+++ b/drivers/media/video/videobuf2-dma-contig.c
@@ -498,6 +498,16 @@ static void *vb2_dc_get_userptr(void *alloc_ctx, unsigned long vaddr,
struct vm_area_struct *vma;
struct sg_table *sgt;
unsigned long contig_size;
+ unsigned long dma_align = dma_get_cache_alignment();
+
+ /*
+ * DMA transfers are not reliable to buffers which
+ * are not cache line aligned!
+ */
+ if (vaddr & (dma_align - 1)) {
+ pr_err("userptr must be aligned to %lu bytes\n", dma_align);
+ return ERR_PTR(-EINVAL);
+ }
buf = kzalloc(sizeof *buf, GFP_KERNEL);
if (!buf)
--
1.7.9.5
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