platform/chrome: cros_ec_proto: check `msg->result` in getting cmd mask

cros_ec_get_host_command_version_mask() should check if EC wasn't happy
by checking `msg->result`.

Use cros_ec_map_error() and return the error code if any.
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
Link: https://lore.kernel.org/r/20220609084957.3684698-17-tzungbi@kernel.org

drivers/platform/chrome/cros_ec_proto.c

@@ -428,13 +428,12 @@ static int cros_ec_get_proto_info_legacy(struct cros_ec_device *ec_dev)
  * the caller has ec_dev->lock mutex or the caller knows there is
  * no other command in progress.
  */
-static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
-	u16 cmd, u32 *mask)
+static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev, u16 cmd, u32 *mask)
 {
 	struct ec_params_get_cmd_versions *pver;
 	struct ec_response_get_cmd_versions *rver;
 	struct cros_ec_command *msg;
-	int ret;
+	int ret, mapped;
 
 	msg = kmalloc(sizeof(*msg) + max(sizeof(*rver), sizeof(*pver)),
 		      GFP_KERNEL);
@@ -450,14 +449,20 @@ static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev,
 	pver->cmd = cmd;
 
 	ret = send_command(ec_dev, msg);
-	if (ret > 0) {
-		rver = (struct ec_response_get_cmd_versions *)msg->data;
-		*mask = rver->version_mask;
-		ret = 0;
+	if (ret < 0)
+		goto exit;
+
+	mapped = cros_ec_map_error(msg->result);
+	if (mapped) {
+		ret = mapped;
+		goto exit;
 	}
 
+	rver = (struct ec_response_get_cmd_versions *)msg->data;
+	*mask = rver->version_mask;
+	ret = 0;
+exit:
 	kfree(msg);
-
 	return ret;
 }