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Subject[patch 55/58] rndis_wlan: fix initialization order for workqueue&workers
2.6.29-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Jussi Kivilinna <jussi.kivilinna@mbnet.fi>

commit e805e4d0b53506dff4255a2792483f094e7fcd2c upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
drivers/net/wireless/rndis_wlan.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)

--- a/drivers/net/wireless/rndis_wlan.c
+++ b/drivers/net/wireless/rndis_wlan.c
@@ -2550,6 +2550,11 @@ static int rndis_wext_bind(struct usbnet
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)
@@ -2594,16 +2599,17 @@ static int rndis_wext_bind(struct usbnet
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;
}



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