[PATCH][Security Check] drm/i915/gvt: return error on cmd access

[Zhao Yan]

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

Signed-off-by: Zhao Yan <yan.y.zhao at intel.com>
---
 drivers/gpu/drm/i915/gvt/cmd_parser.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c
index c39e13abe50d..bc05831faa5f 100644
--- 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_exec_state *s,
 	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 -EPERM;
 	}
 
 	if (is_shadowed_mmio(offset)) {
-- 
2.17.1