linux-kernel - [RFC][PATCH] usb: gadget: rndis: Free the response queue during REMOTE_NDIS_RESET

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Date:	Tue,  9 Feb 2016 01:37:05 +0530
From:	Amit Pundir <amit.pundir@...aro.org>
To:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Cc:	xerox_lin <xerox_lin@....com>, Felipe Balbi <balbi@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
	Badhri Jagan Sridharan <badhri@...gle.com>,
	Android Kernel Team <kernel-team@...roid.com>,
	John Stultz <john.stultz@...aro.org>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Rajkumar Raghupathy <raghup@...eaurora.org>
Subject: [RFC][PATCH] usb: gadget: rndis: Free the 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
blocks any more Rndis transfers.

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

Cc: Felipe Balbi <balbi@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Andrzej Pietrasiewicz <andrzej.p@...sung.com>
Cc: Badhri Jagan Sridharan <badhri@...gle.com>
Cc: Android Kernel Team <kernel-team@...roid.com>
Cc: John Stultz <john.stultz@...aro.org>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
Signed-off-by: Rajkumar Raghupathy <raghup@...eaurora.org>
Signed-off-by: Xerox Lin <xerox_lin@....com>
[pundir: cherry-picked this patch from AOSP experimental/android-4.4 tree.]
Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
---
Cherry-picked this patch from AOSP common/experimental/android-4.4 tree.
I could not find upstream submission history for this patch, so my
apologies in advance if this has already been NACKed before.

 drivers/usb/gadget/function/rndis.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/usb/gadget/function/rndis.c b/drivers/usb/gadget/function/rndis.c
index 70d3917..27163e8 100644
--- a/drivers/usb/gadget/function/rndis.c
+++ b/drivers/usb/gadget/function/rndis.c
@@ -681,6 +681,13 @@ static int rndis_reset_response(struct rndis_params *params,
 	rndis_reset_cmplt_type *resp;
 	rndis_resp_t *r;
 
+	u32 length;
+	u8 *xbuf;
+
+	/* drain the response queue */
+	while ((xbuf = rndis_get_next_response(configNr, &length)))
+		rndis_free_response(configNr, xbuf);
+
 	r = rndis_add_response(params, sizeof(rndis_reset_cmplt_type));
 	if (!r)
 		return -ENOMEM;
-- 
1.9.1