diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index e3a5f673ff673d2784bfc2bff7ca14c0a959578e..8704f7f8d0725664d41140dc2a3cd5e35d1aa612 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -884,6 +884,7 @@ static void execlists_submission_tasklet(unsigned long data)
 
 			head = execlists->csb_head;
 			tail = READ_ONCE(buf[write_idx]);
+			rmb(); /* Hopefully paired with a wmb() in HW */
 		}
 		GEM_TRACE("%s cs-irq head=%d [%d%s], tail=%d [%d%s]\n",
 			  engine->name,