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dma-buf: begin/end_cpu might lock the dma_resv lock 

At least amdgpu and i915 do, so lets just document this as the rule.

v2: Works better with less typos (intel-gfx-ci)

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Link: https://patchwork.freedesktop.org/patch/msgid/20201214171622.3868883-1-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter 2020-12-14 18:16:22 +01:00
parent 85804b70cc
commit 8ccf0a29af
1 changed files with 4 additions and 0 deletions
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4
drivers/dma-buf/dma-buf.c
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@ -1118,6 +1118,8 @@ int dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
if (WARN_ON(!dmabuf))
return -EINVAL;
might_lock(&dmabuf->resv->lock.base);
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(&dmabuf->resv->lock.base);
if (dmabuf->ops->end_cpu_access)
ret = dmabuf->ops->end_cpu_access(dmabuf, direction);