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hyperv: Add buffer for extended info after the RNDIS response message.

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In some response messages, there may be some extended info after the
message.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Haiyang Zhang 2012-10-02 05:30:24 +00:00 committed by David S. Miller
parent 63f6921d30
commit a3a6cab5ea
1 changed files with 13 additions and 11 deletions
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24
drivers/net/hyperv/rndis_filter.c
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@ -32,16 +32,19 @@
#include "hyperv_net.h"
#define RNDIS_EXT_LEN 100
struct rndis_request {
struct list_head list_ent;
struct completion wait_event;
/*
* FIXME: We assumed a fixed size response here. If we do ever need to
* handle a bigger response, we can either define a max response
* message or add a response buffer variable above this field
*/
struct rndis_message response_msg;
/*
* The buffer for extended info after the RNDIS response message. It's
* referenced based on the data offset in the RNDIS message. Its size
* is enough for current needs, and should be sufficient for the near
* future.
*/
u8 response_ext[RNDIS_EXT_LEN];
/* Simplify allocation by having a netvsc packet inline */
struct hv_netvsc_packet pkt;
@ -50,12 +53,10 @@ struct rndis_request {
struct rndis_message request_msg;
/*
* The buffer for the extended info after the RNDIS message. It's
* referenced based on the data offset in the RNDIS message. Its size
* is enough for current needs, and should be sufficient for the near
* future.
* The buffer for the extended info after the RNDIS request message.
* It is referenced and sized in a similar way as response_ext.
*/
u8 ext[100];
u8 request_ext[RNDIS_EXT_LEN];
};
static void rndis_filter_send_completion(void *ctx);
@ -274,7 +275,8 @@ static void rndis_filter_receive_response(struct rndis_device *dev,
spin_unlock_irqrestore(&dev->request_lock, flags);
if (found) {
if (resp->msg_len <= sizeof(struct rndis_message)) {
if (resp->msg_len <=
sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
memcpy(&request->response_msg, resp,
resp->msg_len);
} else {