[RESEND PATCH 11/11] platform/chrome: cros_ec_proto: return -EPROTO if empty payload

[Tzung-Bi Shih]

cros_ec_wait_until_complete() sends EC_CMD_GET_COMMS_STATUS which expects
to receive sizeof(struct ec_response_get_comms_status) from
cros_ec_xfer_command().

Return -EPROTO if cros_ec_xfer_command() returns 0.

Signed-off-by: Tzung-Bi Shih <tzungbi@xxxxxxxxxx>
---
 drivers/platform/chrome/cros_ec_proto.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 5323edddb540..0c7042aa2640 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -166,6 +166,11 @@ static int cros_ec_wait_until_complete(struct cros_ec_device *ec_dev, uint32_t *
 			break;
 		}
 
+		if (ret == 0) {
+			ret = -EPROTO;
+			break;
+		}
+
 		if (!(status->flags & EC_COMMS_STATUS_PROCESSING))
 			break;
 	}
-- 
2.37.0.rc0.161.g10f37bed90-goog