linux-kernel - Re: WARNING: at net/mac80211/scan.c:267 ieee80211_scan

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Date:	Wed, 16 Sep 2009 15:13:06 -0700
From:	reinette chatre <reinette.chatre@...el.com>
To:	Maciej Rutecki <maciej.rutecki@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Wireless List <linux-wireless@...r.kernel.org>,
	"ilw@...ux.intel.com" <ilw@...ux.intel.com>,
	"Zhu, Yi" <yi.zhu@...el.com>
Subject: Re: WARNING: at net/mac80211/scan.c:267
 ieee80211_scan_completed+0x299/0x2b0 	[mac80211]()

Hi Maciej,

On Wed, 2009-09-16 at 12:59 -0700, Maciej Rutecki wrote:

> Script (wifi_wpa.sh):
> #!/bin/sh
> INTERFACE=wlan0
> WPA_FILE=/etc/wpa_supplicant/wpa_supplicant.conf
> DRIVER=wext
> ifconfig eth0 down
> ifconfig $INTERFACE up
> sleep 3
> killall wpa_supplicant &> /dev/null
> wpa_supplicant -c $WPA_FILE -D $DRIVER -i $INTERFACE -B
> dhclient $INTERFACE

I think there is a potential race here. You start wpa_supplicant in
background and then immediately request an IP. It is not guaranteed at
this point that you are associated.

Could you perform the last three steps of your script manually?

Reinette


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