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mac80211: use freezable workqueue for restart work

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Requesting hw restart during suspend might result
in the restart work being executed after mac80211
and the hw are suspended.

Solve the race by simply scheduling the restart
work on a freezable workqueue.

Note that there can be some cases of reconfiguration
on resume (besides the hardware restart):

* wowlan is not configured -
    All the interfaces removed were removed on suspend,
    and drv_stop() was called. At this point the driver
    shouldn't expect for hw_restart anyway, so we can
    simply cancel it (on resume).

* wowlan is configured, drv_resume() == 1
    There is no definitive expected behavior in this case,
    as each driver might have different expectations (e.g.
    setting some flags on suspend/restart vs. not handling
    spurious recovery).
    For now, simply let the hw_restart work run again after
    resume, and hope the driver will handle it well (or at
    least initiate another hw restart).

Signed-off-by: Eliad Peller <eliadx.peller@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Eliad Peller 2015-10-25 10:59:35 +02:00 committed by Johannes Berg
parent a64cba3c53
commit 43d6df007c
2 changed files with 12 additions and 1 deletions
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2
net/mac80211/main.c
View File

@ -281,7 +281,7 @@ void ieee80211_restart_hw(struct ieee80211_hw *hw)
local->in_reconfig = true;
barrier();
schedule_work(&local->restart_work);
queue_work(system_freezable_wq, &local->restart_work);
}
EXPORT_SYMBOL(ieee80211_restart_hw);

11
net/mac80211/util.c
View File

@ -4,6 +4,7 @@
* Copyright 2006-2007 Jiri Benc <jbenc@suse.cz>
* Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
* Copyright 2013-2014 Intel Mobile Communications GmbH
* Copyright (C) 2015 Intel Deutschland GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@ -1753,6 +1754,16 @@ int ieee80211_reconfig(struct ieee80211_local *local)
}
#endif
/*
* In case of hw_restart during suspend (without wowlan),
* cancel restart work, as we are reconfiguring the device
* anyway.
* Note that restart_work is scheduled on a frozen workqueue,
* so we can't deadlock in this case.
*/
if (suspended && local->in_reconfig && !reconfig_due_to_wowlan)
cancel_work_sync(&local->restart_work);
/*
* Upon resume hardware can sometimes be goofy due to
* various platform / driver / bus issues, so restarting