usbnet: add rx queue pausing

Add rx queue pausing to usbnet. This is needed by rndis_wlan so that it can
control rx queue and prevent received packets from being send forward before
rndis_wlan receives and handles 'media connect'-indication. Without this
establishing WPA connections is hard and fail often.

[v2] - removed unneeded use of skb_clone

Cc: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 12 insertions, 1 deletions

diff --git a/drivers/net/wireless/rndis_wlan.c b/drivers/net/wireless/rndis_wlan.c
index 828dc1825bba..d42692dfbc67 100644
--- a/drivers/net/wireless/rndis_wlan.c
+++ b/drivers/net/wireless/rndis_wlan.c
@@ -1764,8 +1764,15 @@ static int rndis_iw_set_essid(struct net_device *dev,
 
         if (!wrqu->essid.flags || length == 0)
                 return disassociate(usbdev, 1);
-        else
+        else {
+                /* Pause and purge rx queue, so we don't pass packets before
+                 * 'media connect'-indication.
+                 */
+                usbnet_pause_rx(usbdev);
+                usbnet_purge_paused_rxq(usbdev);
+
                 return set_essid(usbdev, &ssid);
+        }
 }
 
 
@@ -2328,6 +2335,8 @@ get_bssid:
                         memcpy(evt.ap_addr.sa_data, bssid, ETH_ALEN);
                         wireless_send_event(usbdev->net, SIOCGIWAP, &evt, NULL);
                 }
+
+                usbnet_resume_rx(usbdev);
         }
 
         if (test_and_clear_bit(WORK_LINK_DOWN, &priv->work_pending)) {
@@ -2541,6 +2550,8 @@ static void rndis_wlan_indication(struct usbnet *usbdev, void *ind, int buflen)
 
         switch (msg->status) {
         case RNDIS_STATUS_MEDIA_CONNECT:
+                usbnet_pause_rx(usbdev);
+
                 devinfo(usbdev, "media connect");
 
                 /* queue work to avoid recursive calls into rndis_command */