i915: Don't attempt to short-circuit object_wait_rendering by checking domains.

This could return early when reading after writing a buffer, if somebody
had already put it on the flushing list (write domains are 0, but still
active), leading to glReadPixels failure.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 3 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index b0ec73fa6a93..6b4a2bd20640 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1455,11 +1455,9 @@ i915_gem_object_set_domain_range(struct drm_gem_object *obj,
                                                   read_domains, write_domain);
 
         /* Wait on any GPU rendering to the object to be flushed. */
-        if (obj->write_domain & ~(I915_GEM_DOMAIN_CPU | I915_GEM_DOMAIN_GTT)) {
-                ret = i915_gem_object_wait_rendering(obj);
-                if (ret)
-                        return ret;
-        }
+        ret = i915_gem_object_wait_rendering(obj);
+        if (ret)
+                return ret;
 
         if (obj_priv->page_cpu_valid == NULL) {
                 obj_priv->page_cpu_valid = drm_calloc(1, obj->size / PAGE_SIZE,