tree 6b29c9cc8e91ea4923c6dd8eb90d1ef888540d63
parent d3b029a44e14f5226fd9b410a0a70eb9b7ed6beb
author Chris Wilson <chris@chris-wilson.co.uk> 1483539142 +0000
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1512853316 +0100

dma-fence: Introduce drm_fence_set_error() helper

commit a009e975da5c7d42a7f5eaadc54946eb5f76c9af upstream.

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
[s/dma_fence/fence/g - gregkh]
Cc: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>