From: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Date: Mon, 14 Sep 2015 09:48:45 +0000 (+0100)
Subject: greybus: loopback: add response len to loopback protocol
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4a655ad4c2b83815ccab5057e29bf0f6c981a94e;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

greybus: loopback: add response len to loopback protocol

This patch adds a len field to the loopback protocol.
This field is validated in gb_loopback_transfer() and stuffed in
gb_loopback_request_recv().

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Patrick Titiano <ptitiano@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 77a7c4956929..76fea9a8ef27 100644
--- a/drivers/staging/greybus/greybus_protocols.h
+++ b/drivers/staging/greybus/greybus_protocols.h
@@ -917,6 +917,7 @@ struct gb_loopback_transfer_request {
 } __packed;
 
 struct gb_loopback_transfer_response {
+	__le32	len;
 	__u8	data[0];
 } __packed;
 
diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
index a9b901fbeb5c..ba65457f9f70 100644
--- a/drivers/staging/greybus/loopback.c
+++ b/drivers/staging/greybus/loopback.c
@@ -524,6 +524,7 @@ static int gb_loopback_request_recv(u8 type, struct gb_operation *operation)
 				return -ENOMEM;
 			}
 			response = operation->response->payload;
+			response->len = cpu_to_le32(len);
 			memcpy(response->data, request->data, len);
 		}
 		return 0;