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mac80211: cancel restart_work in ieee80211_unregister_hw

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Unlike most other workqueue-tasks, the restart_work is
not scheduled onto mac80211's private per-interface
workqueue, but onto one of the system-wide workqueues.

Therefore the mac80211-stack has to cancel any pending
restarts, before destroying the shared device context
and handing back the memory. Otherwise - under very
unlucky circumstances - there could be a stale work-
item left, because some other kernel component might
have delayed the execution of ieee80211_restart_work
for too long.

Signed-off-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Christian Lamparter 2010-08-22 23:48:25 +02:00 committed by John W. Linville
parent 11791a6f75
commit 258086a48b
1 changed files with 1 additions and 0 deletions
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1
net/mac80211/main.c
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@ -807,6 +807,7 @@ void ieee80211_unregister_hw(struct ieee80211_hw *hw)
rtnl_unlock();
cancel_work_sync(&local->restart_work);
cancel_work_sync(&local->reconfig_filter);
ieee80211_clear_tx_pending(local);