rndis_wlan: fix initialization order for workqueue&workers

rndis_wext_link_change() might be called from rndis_command() at
initialization stage and priv->workqueue/priv->work have not been
initialized yet. This causes invalid opcode at rndis_wext_bind on
some brands of bcm4320.

Fix by initializing workqueue/workers in rndis_wext_bind() before
rndis_command is used.

This bug has existed since 2.6.25, reported at:
	http://bugzilla.kernel.org/show_bug.cgi?id=12794

Signed-off-by: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/rndis_wlan.c b/drivers/net/wireless/rndis_wlan.c
index db91db7..bebf735 100644 (file)
--- a/drivers/net/wireless/rndis_wlan.c
+++ b/drivers/net/wireless/rndis_wlan.c
@@ -2558,6 +2558,11 @@ static int rndis_wext_bind(struct usbnet *usbdev, struct usb_interface *intf)
        mutex_init(&priv->command_lock);
        spin_lock_init(&priv->stats_lock);
 
+       /* because rndis_command() sleeps we need to use workqueue */
+       priv->workqueue = create_singlethread_workqueue("rndis_wlan");
+       INIT_WORK(&priv->work, rndis_wext_worker);
+       INIT_DELAYED_WORK(&priv->stats_work, rndis_update_wireless_stats);
+
        /* try bind rndis_host */
        retval = generic_rndis_bind(usbdev, intf, FLAG_RNDIS_PHYM_WIRELESS);
        if (retval < 0)
@@ -2603,16 +2608,17 @@ static int rndis_wext_bind(struct usbnet *usbdev, struct usb_interface *intf)
        disassociate(usbdev, 1);
        netif_carrier_off(usbdev->net);
 
-       /* because rndis_command() sleeps we need to use workqueue */
-       priv->workqueue = create_singlethread_workqueue("rndis_wlan");
-       INIT_DELAYED_WORK(&priv->stats_work, rndis_update_wireless_stats);
        queue_delayed_work(priv->workqueue, &priv->stats_work,
                round_jiffies_relative(STATS_UPDATE_JIFFIES));
-       INIT_WORK(&priv->work, rndis_wext_worker);
 
        return 0;
 
 fail:
+       cancel_delayed_work_sync(&priv->stats_work);
+       cancel_work_sync(&priv->work);
+       flush_workqueue(priv->workqueue);
+       destroy_workqueue(priv->workqueue);
+
        kfree(priv);
        return retval;
 }