[OpenWrt-Devel] iwinfo lua scanlist issue

[Peter Uithoven]

Hi OpenWRT dev's,

It looks like the scanlist method of the iwinfo lua binding hangs when the
wifi stack is restarted.

This happens when my init script is called, which attempts to perform a
scan, but the wifi stack is restarted because the country and channel is
changed (according to the wireless configuration in uci). With hanging I
mean that Lua doesn't get past this function call, there is no timeout. And
not being able to make this non blocking makes this pretty problematic.
The only solution thus far was adding a 5 seconds sleep in my init script.

The only traces of info I could find are here:
http://wiki.openwrt.org/doc/howto/wireless.utilities#iwconfig
http://git.openwrt.org/?p=project/iwinfo.git;a=tree;hb=HEAD

This happens in the 14.07 version of OpenWRT.

I can reproduce this after boot with the following lua script:

> local io = require('io')
> local file = assert(io.open('/tmp/scan.log', "a+"))
> local function logger(message)
>   print(message)
>   file:write(message .. "\n")
>   file:flush()
> end
>
> logger("init")
>
> logger("starting wifi restart")
> local handler = io.popen("wifi")
>
> local iwinfo = require('iwinfo')
> local deviceName = 'wlan0'
> local deviceID = iwinfo.type(deviceName)
>
> if not deviceID then
>   logger("wireless device '" .. deviceName .. "' not found")
> else
>   logger("found wireless device '" .. deviceName .. "'")
> end
>
> local wifiDevice = iwinfo[deviceID]
> if not wifiDevice then
>   logger("'iwinfo." .. deviceID .. "' interface not found")
> else
>   logger("found 'iwinfo." .. deviceID .. "' interface")
> end
>
> logger("calling scanlist")
> local scanList = wifiDevice.scanlist(deviceName)
> logger("scanlist completed")
> logger("scanlist:")
> for _,sn in ipairs(scanList) do
>   logger("  - " .. (sn.ssid or "<nil>"))
> end
>
> logger("finished")
>
>
Isn't there a more specific project site, issue queue or mailinglist?

Thanks in advance,
Peter Uithoven
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