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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>
This commit is contained in:
Jussi Kivilinna 2009-04-22 10:59:37 +03:00 committed by John W. Linville
parent 6269b73156
commit e805e4d0b5
1 changed files with 10 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/net/wireless/rndis_wlan.c
View File

@ -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;
}