[PATCH 3/3] mb

[Chris Wilson]

---
 drivers/gpu/drm/i915/intel_lrc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 15b894621ee8..4b8709b9a19f 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1237,6 +1237,8 @@ static int emit_pdps(struct i915_request *rq)
 	 * GPU hangs to forcewake errors and machine lockups!
 	 */
 
+	mb();
+
 	err = engine->emit_flush(rq, EMIT_FLUSH);
 	if (err)
 		return err;
-- 
2.20.0.rc2