On Friday, August 22, 2014 02:08:52 PM Eric Dumazet wrote:
> On Fri, 2014-08-22 at 22:38 +0200, Christian Lamparter wrote:
> [...]
> > From: Andreea-Cristina Bernat <bernat....@gmail.com>
> >
> > The carl9170_op_ampdu_action() function is used only by the mac80211
> > framework. Since the mac80211 already takes care of checks and
> > properly serializing calls to the driver's function there is no
> > need for the driver to do the same thing.
> >
> > ---
> > @@ -1430,18 +1430,10 @@ static int carl9170_op_ampdu_action(struct
> > ieee80211_hw *hw,
> > if (!sta_info->ht_sta)
> > return -EOPNOTSUPP;
> >
> > - rcu_read_lock();
> > - if (rcu_dereference(sta_info->agg[tid])) {
> > - rcu_read_unlock();
> > - return -EBUSY;
> > - }
> > -
> > [...]
> > ---
>
> Sorry but this patch is not complete.
>
> You need to somehow return -EBUSY if sta_info->agg[tid] is set.
The sta_info->agg[tid] check is not needed (for reference, see [0]).
(There is already a check in mac80211 which prevents the leak of
sta_info->agg[tid] [1]).
Regards
Christian
[0] <https://lkml.org/lkml/2014/8/20/725>
[1] <http://lxr.free-electrons.com/source/net/mac80211/agg-tx.c#L583>
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