On Wed 30-11-11 15:23:16, Stanislaw Gruszka wrote:
> On Wed, Nov 30, 2011 at 11:10:28AM +0100, Michal Hocko wrote:
> > On Tue 29-11-11 12:39:07, Stanislaw Gruszka wrote:
> > > On Tue, Nov 29, 2011 at 11:07:27AM +0100, Michal Hocko wrote:
> > > > [I am not sure whether this is ieee80211 or iwl3945 issue so put both
> > > > maintainers into loop]
> > > The only changed we had in iwlegacy between 3.1 and 3.2-rc, was only
> > > adjustment to mac80211 changes. However I think this is iwlegacy issue,
> > > just for some reason bug did not trigger before.
> >
> > I have double checked 3.1 and cannot reproduce it.
> > Anyway, I have put:
> >
> > diff --git a/drivers/net/wireless/iwlegacy/iwl-3945-rs.c b/drivers/net/wireless/iwlegacy/iwl-3945-rs.c
> > index 8faeaf2..9221ed4 100644
> > --- a/drivers/net/wireless/iwlegacy/iwl-3945-rs.c
> > +++ b/drivers/net/wireless/iwlegacy/iwl-3945-rs.c
> > @@ -432,6 +432,7 @@ static void iwl3945_rs_free_sta(void *iwl_priv, struct ieee80211_sta *sta,
> > * to use iwl_priv to print out debugging) since it may not be fully
> > * initialized at this point.
> > */
> > + printk("XXX: deleting time: %x\n", rs_sta->rate_scale_flush.base);
> > del_timer_sync(&rs_sta->rate_scale_flush);
> > }
> >
> > And the timer base is really NULL when the issue happens. So, somebody
> > probably removed the timer already?
>
> I think we call rs_ops->free_sta without rs_ops->alloc_sta, otherwise
> I don't know how it could be NULL in iwl3945_rs_free_sta (excluding memory
> corruption or bug in timer internals).
>
> I suspect this could be a regression introduced by commit:
>
> commit 07ba55d7f1d0da174c9bc545c713b44cee760197
> Author: Arik Nemtsov <arik@xxxxxxxxxx>
> Date: Wed Sep 28 14:12:53 2011 +0300
>
> nl80211/mac80211: allow adding TDLS peers as stations
>
> I'm attaching patch with revert of relevant hunk, because full revert
> would be hard currently. Does it workaround problem for you?
No, didn't help unfortunately...
>
> > > Is this problem 100% reproducible for you ?
> >
> > Yes, it seems to be sufficient to suspend to RAM while associated and
> > turn off the AP before waking up the machine.
> > I wasn't able to reproduce just by turning of the AP while associated
> > without suspend.
>
> I'm not able to recreate, but I'm not using your config as my system
> user-space has problem to startup with it :-(
>
> Stanislaw
> diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
> index b1b1bb3..f773dbb 100644
> --- a/net/mac80211/mlme.c
> +++ b/net/mac80211/mlme.c
> @@ -1144,9 +1144,8 @@ static void ieee80211_set_disassoc(struct ieee80211_sub_if_data *sdata,
> changed |= BSS_CHANGED_BSSID | BSS_CHANGED_HT;
> ieee80211_bss_info_change_notify(sdata, changed);
>
> - /* remove AP and TDLS peers */
> if (remove_sta)
> - sta_info_flush(local, sdata);
> + sta_info_destroy_addr(sdata, bssid);
>
> del_timer_sync(&sdata->u.mgd.conn_mon_timer);
> del_timer_sync(&sdata->u.mgd.bcn_mon_timer);
--
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9
Czech Republic
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