From: Zhao Yan <yan.y.zhao@intel.com>
Date: Wed, 1 Aug 2018 00:15:48 -0400
Subject: drm/i915/gvt: return error on cmd access
Git-commit: 8d458ea0ec331adb4c829289e9a56c97d3c1e542
Patch-mainline: v4.19-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

If a register is not cmd accessible, should not just print error
message. Return error here so as not to deliver this cmd.

v2: return -EBADRQC to align with return value elsewhere. (kevin tian)

Signed-off-by: Zhao Yan <yan.y.zhao@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/i915/gvt/cmd_parser.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/gvt/cmd_parser.c
+++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c
@@ -874,7 +874,7 @@ static int cmd_reg_handler(struct parser
 	if (!intel_gvt_mmio_is_cmd_access(gvt, offset)) {
 		gvt_vgpu_err("%s access to non-render register (%x)\n",
 				cmd, offset);
-		return 0;
+		return -EBADRQC;
 	}
 
 	if (is_shadowed_mmio(offset)) {