iwlwifi: always monitor for stuck queues

commit 342bbf3fee2fa9a18147e74b2e3c4229a4564912 upstream.

If we only monitor while associated, the following
can happen:
 - we're associated, and the queue stuck check
   runs, setting the queue "touch" time to X
 - we disassociate, stopping the monitoring,
   which leaves the time set to X
 - almost 2s later, we associate, and enqueue
   a frame
 - before the frame is transmitted, we monitor
   for stuck queues, and find the time set to
   X, although it is now later than X + 2000ms,
   so we decide that the queue is stuck and
   erroneously restart the device

It happens more with P2P because there we can
go between associated/unassociated frequently.

Reported-by: Ben Cahill <ben.m.cahill@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/wireless/iwlwifi/iwl-core.c b/drivers/net/wireless/iwlwifi/iwl-core.c
index fcf5416..3d75d4c 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-core.c
+++ b/drivers/net/wireless/iwlwifi/iwl-core.c
@@ -1787,20 +1787,10 @@ void iwl_bg_watchdog(unsigned long data)
        if (timeout == 0)
                return;
 
-       /* monitor and check for stuck cmd queue */
-       if (iwl_check_stuck_queue(priv, priv->shrd->cmd_queue))
-               return;
-
-       /* monitor and check for other stuck queues */
-       if (iwl_is_any_associated(priv)) {
-               for (cnt = 0; cnt < hw_params(priv).max_txq_num; cnt++) {
-                       /* skip as we already checked the command queue */
-                       if (cnt == priv->shrd->cmd_queue)
-                               continue;
-                       if (iwl_check_stuck_queue(priv, cnt))
-                               return;
-               }
-       }
+       /* monitor and check for stuck queues */
+       for (cnt = 0; cnt < hw_params(priv).max_txq_num; cnt++)
+               if (iwl_check_stuck_queue(priv, cnt))
+                       return;
 
        mod_timer(&priv->watchdog, jiffies +
                  msecs_to_jiffies(IWL_WD_TICK(timeout)));