drm/i915: Remove assertion over write domain after i915_gem_object_sync()

As we move to lazily clearing the GPU write domain only when the buffer
becomes inactive, this leaves a window of opportunity for
i915_gem_object_pin_to_display_plane() to detect a seemingly
inconsistent value. This function is special as it tries to pipeline the
operation to avoid the stall and so may not retires the buffer and we
may not get the opportunity to clear the write domain. However, we know
all is good, so drop the assertion.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 771b8ba36e449ad371551e3169ade79695ae84f5..3bef7e60ddd6895d030351efb54263ab0b56c0ea 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -3091,7 +3091,7 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
        /* It should now be out of any other write domains, and we can update
         * the domain values for our changes.
         */
-       BUG_ON((obj->base.write_domain & ~I915_GEM_DOMAIN_GTT) != 0);
+       obj->base.write_domain = 0;
        obj->base.read_domains |= I915_GEM_DOMAIN_GTT;
 
        trace_i915_gem_object_change_domain(obj,