linux-kernel - [PATCH] usb: gadget: rndis: free response queue during REMOTE_NDIS_RESET

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Date:	Mon, 27 Jun 2016 13:33:59 +0530
From:	Amit Pundir <amit.pundir@...aro.org>
To:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	balbi@...nel.org, gregkh@...uxfoundation.org,
	andrzej.p@...sung.com, kernel-team@...roid.com,
	john.stultz@...aro.org, xerox_lin <xerox_lin@....com>,
	Rajkumar Raghupathy <raghup@...eaurora.org>
Subject: [PATCH] usb: gadget: rndis: free response queue during REMOTE_NDIS_RESET_MSG

From: xerox_lin <xerox_lin@....com>

When rndis data transfer is in progress, some Windows7 Host PC is not
sending the GET_ENCAPSULATED_RESPONSE command for receiving the response
for the previous SEND_ENCAPSULATED_COMMAND processed.

The rndis function driver appends each response for the
SEND_ENCAPSULATED_COMMAND in a queue. As the above process got corrupted,
the Host sends a REMOTE_NDIS_RESET_MSG command to do a soft-reset.
As the rndis response queue is not freed, the previous response is sent
as a part of this REMOTE_NDIS_RESET_MSG's reset response and the Host
block any more Rndis transfers.

Hence free the rndis response queue as a part of this soft-reset so that
the correct response for REMOTE_NDIS_RESET_MSG is sent properly during the
response command.

Signed-off-by: Rajkumar Raghupathy <raghup@...eaurora.org>
Signed-off-by: Xerox Lin <xerox_lin@....com>
[AmitP: Cherry-picked this patch and folded other relevant
        fixes from Android common kernel android-4.4]
Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
---
Cherry picked this usb tethering fix from AOSP kernel/common/android-4.4
tree and to make sure it doesn't get overlooked, submiting it for review
and comment.

 drivers/usb/gadget/function/rndis.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/gadget/function/rndis.c b/drivers/usb/gadget/function/rndis.c
index 943c21a..ab6ac1b 100644
--- a/drivers/usb/gadget/function/rndis.c
+++ b/drivers/usb/gadget/function/rndis.c
@@ -680,6 +680,12 @@ static int rndis_reset_response(struct rndis_params *params,
 {
 	rndis_reset_cmplt_type *resp;
 	rndis_resp_t *r;
+	u8 *xbuf;
+	u32 length;
+
+	/* drain the response queue */
+	while ((xbuf = rndis_get_next_response(params, &length)))
+		rndis_free_response(params, xbuf);

 	r = rndis_add_response(params, sizeof(rndis_reset_cmplt_type));
 	if (!r)
-- 
2.7.4