Re: attempt to scan fails (device busy) if essid/ssid was changedrecently
From: Johannes Berg
Date: Tue Apr 07 2009 - 04:18:38 EST
On Tue, 2009-04-07 at 03:00 +0300, Maxim Levitsky wrote:
> I noticed that always first attempt at scan fails when NM asks for scan.
> I also noticed that this happens with quite recent kernels (I think
> 2,6.28) didn't have this behavior.
I'm pretty sure it did.
> Looking a bit deeper I discovered that each time NM disconnects from a
> networks it sets random ssid/essid to the card (using wireless
> extensions)
This forces a scan
> After that scan fails for some time.
>
> as a NM free example you can run
>
> iwconfig wlan0 essid dummy
> iwlist scan
and then this fails with EBUSY.
johannes
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