USB: rndis: Free the rndis response queue during REMOTE_NDIS_RESET_MSG

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.

Change-Id: I8eff3849db452fe01b7d1fe4140ef1f1ad3f4fd4
Signed-off-by: Rajkumar Raghupathy <raghup@codeaurora.org>
Signed-off-by: Xerox Lin <xerox_lin@htc.com>

diff --git a/drivers/usb/gadget/function/rndis.c b/drivers/usb/gadget/function/rndis.c
index 70d3917cc00364e71ca0900557c09fd02ce56bc3..27163e816be4825492fb38c07b50dece2d348e71 100644 (file)
--- 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;