[PATCH] Fix scanning state when sched_scan is stopped explicitly

Jouni Malinen j
Sat Mar 7 11:46:30 PST 2015

On Fri, Apr 11, 2014 at 09:51:14AM -0700, Dmitry Shmidt wrote:
> On Fri, Apr 11, 2014 at 9:09 AM, Jouni Malinen <j at w1.fi> wrote:
> > On Wed, Apr 09, 2014 at 03:48:07PM -0700, Dmitry Shmidt wrote:
> >> --- a/wpa_supplicant/scan.c
> >> +++ b/wpa_supplicant/scan.c
> >> @@ -261,6 +261,9 @@ int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
> >>               wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
> >>               /* TODO: what to do if stopping fails? */
> >>               return -1;
> >> +     } else {
> >> +             wpa_s->sched_scanning = 0;
> >> +             wpa_supplicant_notify_scanning(wpa_s, 0);

I have this in my pending queue, but I'm not completely sure what to do
about this.

Is there still a case where this would be needed? If so, I guess I can
apply this since I have not really had a chance to do any real
sched_scan testing myself and no one has come up with additional
justification for delaying the notification until the driver has
actually completed stopping of sched_scan.

> > I would assume there was a reason for postponing, but then again, I now
> > remember that there were open questions on a related area.. I think
> > there was a request to revert commit
> > cf70d2981df1be7005fb90c2532e737ab39bc119 and handle some of the changes
> > in mac80211 to make operations synchronous. I guess we should get open
> > item resolved as well.. I'm not completely sure whether these two
> > changes have any dependencies to each other, though.
> I think Raja's change is related to "coordination" between sched scan
> by wpa_supplicant
> and explicit one.

This revert request has not gone anywhere either.. Would someone still
remember what the issue here is and whether there is still need to
either revert that commit cf70d2981df1be7005fb90c2532e737ab39bc119
('wpa_supplicant: Schedule PNO on completion of ongoing sched_scan') or
fix something in it?

It would be nice to see a debug log showing the issue since I don't have
very convenient test setup for sched_scan.

Jouni Malinen                                            PGP id EFC895FA

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