* Race problem in mac80211/mlme.c and rt2x00
@ 2008-08-28 15:51 Lars Ericsson
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From: Lars Ericsson @ 2008-08-28 15:51 UTC (permalink / raw)
To: linux-wireless, rt2400-devel
Hi,
I have found a race problem in mac80211/mlme.c and rt2x00
When the wpa_supplicant trigs an AP scan, mlme saves current configuration
and start scanning.
When the scan is complete, a SIOCGIWSCAN is sent and the saved configuration
is restored.
Since the SIOCGIWSCAN signal is send before the restore, a wpa_supplicant
initiated SIWFREQ may hit the restore operation.
The result is that local->ops->config() may be called by two different
processes at the 'same' time.
In the rt2x00 driver, rt2x00mac_config() may 'optimise' (skip) the channel
set operation.
The ultimate result/error is that the first authentication will happen on
wrong (old) channel.
I have moved the SIOCGIWSCAN code section after the restore operation and it
seems to work.
There is most likely a better solution but I leave that for the experts :)
/Lars
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