[CONNECTOR]: clean up {,__}cn_rx_skb()

- __cn_rx_skb() does nothing but calls cn_call_callback(), it doesn't
check skb and msg sizes as the comment suggests, but cn_rx_skb() checks
those sizes.

- In cn_rx_skb() Local variable 'len' is not used. 'len' is probably
intended to be passed to skb_pull(), but here skb_pull() is not needed,
instead skb_free() is called.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/connector/connector.c

@@ -181,34 +181,15 @@ static int cn_call_callback(struct cn_msg *msg, void (*destruct_data)(void *), v
 	return err;
 }
 
-/*
- * Skb receive helper - checks skb and msg size and calls callback
- * helper.
- */
-static int __cn_rx_skb(struct sk_buff *skb, struct nlmsghdr *nlh)
-{
-	u32 pid, uid, seq, group;
-	struct cn_msg *msg;
-
-	pid = NETLINK_CREDS(skb)->pid;
-	uid = NETLINK_CREDS(skb)->uid;
-	seq = nlh->nlmsg_seq;
-	group = NETLINK_CB((skb)).dst_group;
-	msg = NLMSG_DATA(nlh);
-
-	return cn_call_callback(msg, (void (*)(void *))kfree_skb, skb);
-}
-
 /*
  * Main netlink receiving function.
  *
- * It checks skb and netlink header sizes and calls the skb receive
- * helper with a shared skb.
+ * It checks skb, netlink header and msg sizes, and calls callback helper.
  */
 static void cn_rx_skb(struct sk_buff *__skb)
 {
+	struct cn_msg *msg;
 	struct nlmsghdr *nlh;
-	u32 len;
 	int err;
 	struct sk_buff *skb;
 
@@ -224,11 +205,8 @@ static void cn_rx_skb(struct sk_buff *__skb)
 			return;
 		}
 
-		len = NLMSG_ALIGN(nlh->nlmsg_len);
-		if (len > skb->len)
-			len = skb->len;
-
-		err = __cn_rx_skb(skb, nlh);
+		msg = NLMSG_DATA(nlh);
+		err = cn_call_callback(msg, (void (*)(void *))kfree_skb, skb);
 		if (err < 0)
 			kfree_skb(skb);
 	}