greybus: loopback: Add reserved fields to transfer request

All loopback transfer operations should have an identical header
format in order to facilitate bandwidth and data movement analysis.

Suggested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

diff --git a/drivers/staging/greybus/greybus_protocols.h b/drivers/staging/greybus/greybus_protocols.h
index cd64ac8..6b19292 100644 (file)
--- a/drivers/staging/greybus/greybus_protocols.h
+++ b/drivers/staging/greybus/greybus_protocols.h
@@ -1053,8 +1053,14 @@ struct gb_uart_serial_state_request {
 #define GB_LOOPBACK_TYPE_TRANSFER              0x03
 #define GB_LOOPBACK_TYPE_SINK                  0x04
 
+/*
+ * Loopback request/response header format should be identical
+ * to simplify bandwidth and data movement analysis.
+ */
 struct gb_loopback_transfer_request {
        __le32  len;
+       __le32  reserved0;
+       __le32  reserved1;
        __u8    data[0];
 } __packed;