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dma-buf: give examples of error codes to use

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The dma_fence_set_error() function allows to set an error code on a
dma_fence object before it is signaled.

Document some of the potential error codes drivers should use and
especially what they mean.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240826122541.85663-2-christian.koenig@amd.com
This commit is contained in:
Christian König 2024-08-26 14:25:39 +02:00 committed by Christian König
parent b2ef808786
commit a401bd1264
1 changed files with 6 additions and 0 deletions
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6
include/linux/dma-fence.h
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@ -574,6 +574,12 @@ int dma_fence_get_status(struct dma_fence *fence);
* rather than success. This must be set before signaling (so that the value
* is visible before any waiters on the signal callback are woken). This
* helper exists to help catching erroneous setting of #dma_fence.error.
*
* Examples of error codes which drivers should use:
*
* * %-ENODATA This operation produced no data, no other operation affected.
* * %-ECANCELED All operations from the same context have been canceled.
* * %-ETIME Operation caused a timeout and potentially device reset.
*/
static inline void dma_fence_set_error(struct dma_fence *fence,
int error)