At least amdgpu and i915 do, so lets just document this as the rule.
Signed-off-by: Daniel Vetter <daniel.vet...@intel.com>
Cc: Thomas Zimmermann <tzimmerm...@suse.de>
Cc: Sumit Semwal <sumit.sem...@linaro.org>
Cc: "Christian König" <christian.koe...@amd.com>
Cc: linux-me...@vger.kernel.org
Cc: linaro-mm-...@lists.linaro.org
---
drivers/dma-buf/dma-buf.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index e1fa6c6f02c4..00d5afe904cc 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -1118,6 +1118,8 @@ int dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
if (WARN_ON(!dmabuf))
return -EINVAL;
+ might_lock(&dma_buf->resv.lock);
+
if (dmabuf->ops->begin_cpu_access)
ret = dmabuf->ops->begin_cpu_access(dmabuf, direction);
@@ -1151,6 +1153,8 @@ int dma_buf_end_cpu_access(struct dma_buf *dmabuf,
WARN_ON(!dmabuf);
+ might_lock(&dma_buf->resv.lock);
+
if (dmabuf->ops->end_cpu_access)
ret = dmabuf->ops->end_cpu_access(dmabuf, direction);
--
2.29.2
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