drm/i915: Fix i915_request fence wait semantics
The i915_request fence wait behaves differently for timeout = 0 compared to expected dma-fence behavior. i915 behavior: - Unsignaled: -ETIME - Signaled: 0 (= timeout) Expected: - Unsignaled: 0 - Signaled: 1 Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Acked-by: Daniel Vetter <daniel@ffwll.ch> Acked-by: Christian König <christian.koenig@amd.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211116102431.198905-6-christian.koenig@amd.comSigned-off-by: Christian König <christian.koenig@amd.com>
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