diff options
| author | Jason Andryuk <jandryuk@gmail.com> | 2009-02-21 09:53:14 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-02-27 14:53:00 -0500 |
| commit | deda862e699f0aba6f0975e138a0258d1b29f2df (patch) | |
| tree | fa13583ac379d8837012cd65c59ca0b14b14a4aa /drivers/net | |
| parent | 2f92cd2e5f1751f7da5fa9b58e0ab22da6577cfd (diff) | |
at76c50x-usb: fix oops on disconnect
flush_workqueue needs to be called instead of the generic one and the
associated functions need to be modified to prevent re-adding
themselves to the workqueue.
The rx_tasklet is also killed in the small (?) chance it is scheduled.
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>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/wireless/at76c50x-usb.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/drivers/net/wireless/at76c50x-usb.c b/drivers/net/wireless/at76c50x-usb.c index aa06b90664d..c79591ee205 100644 --- a/drivers/net/wireless/at76c50x-usb.c +++ b/drivers/net/wireless/at76c50x-usb.c @@ -1848,6 +1848,9 @@ static void at76_dwork_hw_scan(struct work_struct *work) dwork_hw_scan.work); int ret; + if (priv->device_unplugged) + return; + mutex_lock(&priv->mtx); ret = at76_get_cmd_status(priv->udev, CMD_SCAN); @@ -1882,6 +1885,9 @@ static int at76_hw_scan(struct ieee80211_hw *hw, at76_dbg(DBG_MAC80211, "%s():", __func__); + if (priv->device_unplugged) + return 0; + mutex_lock(&priv->mtx); ieee80211_stop_queues(hw); @@ -1985,6 +1991,10 @@ static void at76_configure_filter(struct ieee80211_hw *hw, flags = changed_flags & AT76_SUPPORTED_FILTERS; *total_flags = AT76_SUPPORTED_FILTERS; + /* Bail out after updating flags to prevent a WARN_ON in mac80211. */ + if (priv->device_unplugged) + return; + /* FIXME: access to priv->promisc should be protected with * priv->mtx, but it's impossible because this function needs to be * atomic */ @@ -2085,8 +2095,7 @@ static struct at76_priv *at76_alloc_new_device(struct usb_device *udev) INIT_WORK(&priv->work_submit_rx, at76_work_submit_rx); INIT_DELAYED_WORK(&priv->dwork_hw_scan, at76_dwork_hw_scan); - priv->rx_tasklet.func = at76_rx_tasklet; - priv->rx_tasklet.data = 0; + tasklet_init(&priv->rx_tasklet, at76_rx_tasklet, 0); priv->pm_mode = AT76_PM_OFF; priv->pm_period = 0; @@ -2225,6 +2234,7 @@ static int at76_init_new_device(struct at76_priv *priv, priv->scan_min_time = DEF_SCAN_MIN_TIME; priv->scan_max_time = DEF_SCAN_MAX_TIME; priv->scan_mode = SCAN_TYPE_ACTIVE; + priv->device_unplugged = 0; /* mac80211 initialisation */ priv->hw->wiphy->max_scan_ssids = 1; @@ -2266,13 +2276,12 @@ static void at76_delete_device(struct at76_priv *priv) /* The device is gone, don't bother turning it off */ priv->device_unplugged = 1; - if (priv->mac80211_registered) - ieee80211_unregister_hw(priv->hw); + tasklet_kill(&priv->rx_tasklet); - /* assuming we used keventd, it must quiesce too */ - flush_scheduled_work(); - - kfree(priv->bulk_out_buffer); + if (priv->mac80211_registered) { + flush_workqueue(priv->hw->workqueue); + ieee80211_unregister_hw(priv->hw); + } if (priv->tx_urb) { usb_kill_urb(priv->tx_urb); @@ -2285,6 +2294,8 @@ static void at76_delete_device(struct at76_priv *priv) at76_dbg(DBG_PROC_ENTRY, "%s: unlinked urbs", __func__); + kfree(priv->bulk_out_buffer); + if (priv->rx_skb) kfree_skb(priv->rx_skb); |