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dma-fence: Make ->wait callback optional

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Almost everyone uses dma_fence_default_wait.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: linux-media@vger.kernel.org
Cc: linaro-mm-sig@lists.linaro.org
Link: https://patchwork.freedesktop.org/patch/msgid/20180427061724.28497-6-daniel.vetter@ffwll.ch
This commit is contained in:
Daniel Vetter
2018-04-27 08:17:12 +02:00
parent 90e9965524
commit 49a53d493e
4 changed files with 12 additions and 8 deletions
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13
include/linux/dma-fence.h
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@@ -191,11 +191,14 @@ struct dma_fence_ops {
/**
* @wait:
*
* Custom wait implementation, or dma_fence_default_wait.
* Custom wait implementation, defaults to dma_fence_default_wait() if
* not set.
*
* Must not be NULL, set to dma_fence_default_wait for default implementation.
* the dma_fence_default_wait implementation should work for any fence, as long
* as enable_signaling works correctly.
* The dma_fence_default_wait implementation should work for any fence, as long
* as @enable_signaling works correctly. This hook allows drivers to
* have an optimized version for the case where a process context is
* already available, e.g. if @enable_signaling for the general case
* needs to set up a worker thread.
*
* Must return -ERESTARTSYS if the wait is intr = true and the wait was
* interrupted, and remaining jiffies if fence has signaled, or 0 if wait
@@ -203,7 +206,7 @@ struct dma_fence_ops {
* which should be treated as if the fence is signaled. For example a hardware
* lockup could be reported like that.
*
* This callback is mandatory.
* This callback is optional.
*/
signed long (*wait)(struct dma_fence *fence,
bool intr, signed long timeout);