at76c50x-usb: additional disconnect fixes

Additional attempts to fix Oops on disconnect, that appear to be successful.
However, some may be extraneous.

The cancel_delayed_work call is probably the most necessary.  The
device_unplugged check may not be necessary.  del_timer_sync may not
be necessary either, but the Oops I was receiving was related to
timers.  Hence the addition.

Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Signed-off-by: Kalle Valo <kalle.valo@iki.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/at76c50x-usb.c b/drivers/net/wireless/at76c50x-usb.c
index 46ac9e2..64d4192 100644 (file)
--- a/drivers/net/wireless/at76c50x-usb.c
+++ b/drivers/net/wireless/at76c50x-usb.c
@@ -1497,6 +1497,9 @@ static void at76_work_set_promisc(struct work_struct *work)
                                              work_set_promisc);
        int ret = 0;
 
+       if (priv->device_unplugged)
+               return;
+
        mutex_lock(&priv->mtx);
 
        priv->mib_buf.type = MIB_LOCAL;
@@ -2290,6 +2293,7 @@ static void at76_delete_device(struct at76_priv *priv)
        tasklet_kill(&priv->rx_tasklet);
 
        if (priv->mac80211_registered) {
+               cancel_delayed_work(&priv->dwork_hw_scan);
                flush_workqueue(priv->hw->workqueue);
                ieee80211_unregister_hw(priv->hw);
        }
@@ -2307,6 +2311,8 @@ static void at76_delete_device(struct at76_priv *priv)
 
        kfree(priv->bulk_out_buffer);
 
+       del_timer_sync(&ledtrig_tx_timer);
+
        if (priv->rx_skb)
                kfree_skb(priv->rx_skb);