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dma-fence: Introduce drm_fence_set_error() helper

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The dma_fence.error field (formerly known as dma_fence.status) is an
optional field that may be set by drivers before calling
dma_fence_signal(). The field can be used to indicate that the fence was
completed in err rather than with success, and is visible to other
consumers of the fence and to userspace via sync_file.

This patch renames the field from status to error so that its meaning is
hopefully more clear (and distinct from dma_fence_get_status() which is
a composite between the error state and signal state) and adds a helper
that validates the preconditions of when it is suitable to adjust the
error field.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20170104141222.6992-3-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson
2017-01-04 14:12:22 +00:00
committed by Sumit Semwal
parent d6c99f4bf0
commit a009e975da
2 changed files with 26 additions and 6 deletions
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2
drivers/dma-buf/dma-fence.c
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@@ -566,7 +566,7 @@ dma_fence_init(struct dma_fence *fence, const struct dma_fence_ops *ops,
fence->context = context;
fence->seqno = seqno;
fence->flags = 0UL;
fence->status = 0;
fence->error = 0;
trace_dma_fence_init(fence);
}