libertas: clear current command on card removal

If certain commands were in-flight when the card was pulled or the
driver rmmod-ed, cleanup would block on the work queue stopping, but the
work queue was in turn blocked on the current command being canceled,
which didn't happen.  Fix that.

Signed-off-by: Dan Williams <dcbw@redhat.com>
Cc: stable <stable@kernel.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/libertas/main.c b/drivers/net/wireless/libertas/main.c
index 2436634..73dc8c7 100644 (file)
--- a/drivers/net/wireless/libertas/main.c
+++ b/drivers/net/wireless/libertas/main.c
@@ -1205,7 +1205,13 @@ void lbs_remove_card(struct lbs_private *priv)
        cancel_delayed_work_sync(&priv->scan_work);
        cancel_delayed_work_sync(&priv->assoc_work);
        cancel_work_sync(&priv->mcast_work);
+
+       /* worker thread destruction blocks on the in-flight command which
+        * should have been cleared already in lbs_stop_card().
+        */
+       lbs_deb_main("destroying worker thread\n");
        destroy_workqueue(priv->work_thread);
+       lbs_deb_main("done destroying worker thread\n");
 
        if (priv->psmode == LBS802_11POWERMODEMAX_PSP) {
                priv->psmode = LBS802_11POWERMODECAM;
@@ -1323,14 +1329,26 @@ void lbs_stop_card(struct lbs_private *priv)
                device_remove_file(&dev->dev, &dev_attr_lbs_rtap);
        }
 
-       /* Flush pending command nodes */
+       /* Delete the timeout of the currently processing command */
        del_timer_sync(&priv->command_timer);
+
+       /* Flush pending command nodes */
        spin_lock_irqsave(&priv->driver_lock, flags);
+       lbs_deb_main("clearing pending commands\n");
        list_for_each_entry(cmdnode, &priv->cmdpendingq, list) {
                cmdnode->result = -ENOENT;
                cmdnode->cmdwaitqwoken = 1;
                wake_up_interruptible(&cmdnode->cmdwait_q);
        }
+
+       /* Flush the command the card is currently processing */
+       if (priv->cur_cmd) {
+               lbs_deb_main("clearing current command\n");
+               priv->cur_cmd->result = -ENOENT;
+               priv->cur_cmd->cmdwaitqwoken = 1;
+               wake_up_interruptible(&priv->cur_cmd->cmdwait_q);
+       }
+       lbs_deb_main("done clearing commands\n");
        spin_unlock_irqrestore(&priv->driver_lock, flags);
 
        unregister_netdev(dev);