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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>
This commit is contained in:
Jason Andryuk 2009-02-21 09:53:14 +02:00 committed by John W. Linville
parent 2f92cd2e5f
commit deda862e69
1 changed files with 19 additions and 8 deletions
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27
drivers/net/wireless/at76c50x-usb.c
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@ -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)
tasklet_kill(&priv->rx_tasklet);
if (priv->mac80211_registered) {
flush_workqueue(priv->hw->workqueue);
ieee80211_unregister_hw(priv->hw);
/* assuming we used keventd, it must quiesce too */
flush_scheduled_work();
kfree(priv->bulk_out_buffer);
}
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);