drm/i915: Propagate fence errors
Errors spread like wildfire, and must eventually be returned to the user. They need to be captured and passed along the flow of fences, infecting each in turn with the existing error, until finally they fall out of a user visible result. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Matthew Auld <matthew.auld@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190817232511.11391-1-chris@chris-wilson.co.uk
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