attempt to scan fails (device busy) if essid/ssid was changedrecently
From: Maxim Levitsky
Date: Mon Apr 06 2009 - 20:00:27 EST
Recently I was trying to reduce time it takes for wireless card to
connect.
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.
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)
After that scan fails for some time.
as a NM free example you can run
iwconfig wlan0 essid dummy
iwlist scan
and this will fail
NM in this case waits for whole 10 seconds.
What do you think about this?
I confirm that on iwl3945 and ath5k, so this isn't driver specific.
Best regards,
Maxim Levitsky
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