at76c50x-usb: avoid mutex deadlock in at76_dwork_hw_scan
http://bugzilla.kernel.org/show_bug.cgi?id=13312
at76_dwork_hw_scan holds a mutex while calling ieee80211_scan_completed,
which then calls at76_config which needs the same mutex. This reworks
the ordering to not hold the lock while calling ieee80211_scan_completed.
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 744f4f4..8d93ca4 100644
--- a/drivers/net/wireless/at76c50x-usb.c
+++ b/drivers/net/wireless/at76c50x-usb.c
@@ -1873,18 +1873,18 @@
if (ret != CMD_STATUS_COMPLETE) {
queue_delayed_work(priv->hw->workqueue, &priv->dwork_hw_scan,
SCAN_POLL_INTERVAL);
- goto exit;
+ mutex_unlock(&priv->mtx);
+ return;
}
- ieee80211_scan_completed(priv->hw, false);
-
if (is_valid_ether_addr(priv->bssid))
at76_join(priv);
- ieee80211_wake_queues(priv->hw);
-
-exit:
mutex_unlock(&priv->mtx);
+
+ ieee80211_scan_completed(priv->hw, false);
+
+ ieee80211_wake_queues(priv->hw);
}
static int at76_hw_scan(struct ieee80211_hw *hw,