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mac80211: fix suspend

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Jan reported that his b43-based laptop hangs during suspend.
The problem turned out to be mac80211 asking the driver to
stop the hardware before removing interfaces, and interface
removal caused b43 to touch the hardware (while down, which
causes the hang).

This patch fixes mac80211 to do reorder these operations to
have them in the correct order -- first remove interfaces
and then stop the hardware. Some more code is necessary to
be able to do so in a race-free manner, in particular it is
necessary to not process frames received during quiescing.

Fixes http://bugzilla.kernel.org/show_bug.cgi?id=13337.

Reported-by: Jan Scholz <scholz@fias.uni-frankfurt.de>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2009-07-28 18:10:17 +02:00 committed by John W. Linville
parent 57921c312e
commit 89c3a8aca2
2 changed files with 27 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
net/mac80211/pm.c
View File

@ -55,15 +55,6 @@ int __ieee80211_suspend(struct ieee80211_hw *hw)
rcu_read_unlock();
/* flush again, in case driver queued work */
flush_workqueue(local->hw.workqueue);
/* stop hardware - this must stop RX */
if (local->open_count) {
ieee80211_led_radio(local, false);
drv_stop(local);
}
/* remove STAs */
spin_lock_irqsave(&local->sta_lock, flags);
list_for_each_entry(sta, &local->sta_list, list) {
@ -111,7 +102,22 @@ int __ieee80211_suspend(struct ieee80211_hw *hw)
drv_remove_interface(local, &conf);
}
/* stop hardware - this must stop RX */
if (local->open_count) {
ieee80211_led_radio(local, false);
drv_stop(local);
}
/*
* flush again, in case driver queued work -- it
* shouldn't be doing (or cancel everything in the
* stop callback) that but better safe than sorry.
*/
flush_workqueue(local->hw.workqueue);
local->suspended = true;
/* need suspended to be visible before quiescing is false */
barrier();
local->quiescing = false;
return 0;

12
net/mac80211/rx.c
View File

@ -2453,6 +2453,18 @@ void __ieee80211_rx(struct ieee80211_hw *hw, struct sk_buff *skb,
return;
}
/*
* If we're suspending, it is possible although not too likely
* that we'd be receiving frames after having already partially
* quiesced the stack. We can't process such frames then since
* that might, for example, cause stations to be added or other
* driver callbacks be invoked.
*/
if (unlikely(local->quiescing || local->suspended)) {
kfree_skb(skb);
return;
}
if (status->flag & RX_FLAG_HT) {
/* rate_idx is MCS index */
if (WARN_ON(status->rate_idx < 0 ||