Re: [PATCH] mac80211: handle failed scan requests in STA mode

[Helmut Schaa <helmut.schaa@googlemail.com>]

Am Montag, 9. M=E4rz 2009 schrieb Helmut Schaa:
> If cfg80211 requests a scan it awaits either a return code !=3D 0 fro=
m
> the scan function or the cfg80211_scan_done to be called. In case of
> a STA mac80211's scan function ever returns 0 and queues the scan req=
uest.
> If ieee80211_sta_work is executed and ieee80211_start_scan fails for
> some reason cfg80211_scan_done will never be called but cfg80211 stil=
l
> thinks the scan was triggered successfully and will refuse any future
> scan requests due to drv->scan_req not being cleaned up.
>=20
> If a scan is triggered from within the MLME a similar problem appears=
=2E If
> ieee80211_start_scan returns an error, local->scan_req will not be re=
set
> and mac80211 will refuse any future scan requests.
>=20
> Hence, in both cases call ieee80211_scan_failed (which notifies cfg80=
211
> and resets local->scan_req) if ieee80211_start_scan returns an error.
>=20
> Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>

Btw, John, I guess this should go into linux-next as the cfg80211-scan =
code
is there already and otherwise cfg80211 and mac80211 can get stuck (ref=
uses
any scan requests) when the iwlwifi killswitch is used (only tested wit=
h
NetworkManager).

I'm not sure if anything apart from the killswitch also triggers this i=
ssue.

Thanks,
Helmut
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