From a3a6cab5ea10cca64d036851fe0d932448f2fe4f Mon Sep 17 00:00:00 2001 From: Haiyang Zhang Date: Tue, 2 Oct 2012 05:30:24 +0000 Subject: [PATCH] hyperv: Add buffer for extended info after the RNDIS response message. In some response messages, there may be some extended info after the message. Signed-off-by: Haiyang Zhang Reviewed-by: K. Y. Srinivasan Signed-off-by: David S. Miller --- drivers/net/hyperv/rndis_filter.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c index e7e12cfbbf37..928148cc3220 100644 --- a/drivers/net/hyperv/rndis_filter.c +++ b/drivers/net/hyperv/rndis_filter.c @@ -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; + struct rndis_message response_msg; /* - * 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 + * 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. */ - struct rndis_message response_msg; + 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 { -- 2.20.1