drm/i915: Tidy awaiting on dma-fences

Just tidy up the return handling for completed dma-fences. While it may
return errors for invalid fence, we already know that we have a good
fence and the only error will be an already signaled fence.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200511075722.13483-5-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c b/drivers/gpu/drm/i915/i915_sw_fence.c
index 7daf81f..295b982 100644 (file)
--- a/drivers/gpu/drm/i915/i915_sw_fence.c
+++ b/drivers/gpu/drm/i915/i915_sw_fence.c
@@ -546,13 +546,11 @@ int __i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
        cb->fence = fence;
        i915_sw_fence_await(fence);
 
-       ret = dma_fence_add_callback(dma, &cb->base, __dma_i915_sw_fence_wake);
-       if (ret == 0) {
-               ret = 1;
-       } else {
+       ret = 1;
+       if (dma_fence_add_callback(dma, &cb->base, __dma_i915_sw_fence_wake)) {
+               /* fence already signaled */
                __dma_i915_sw_fence_wake(dma, &cb->base);
-               if (ret == -ENOENT) /* fence already signaled */
-                       ret = 0;
+               ret = 0;
        }
 
        return ret;