MC7430 Connection problem

Erik Kazandjian erik.kazandjian at
Tue Oct 3 05:53:07 UTC 2017

I tried this and indeed I get

echo Y > /sys/class/net/wwan0/qmi/raw_ip
bash: echo: write error: Device or resource busy

I stopped the interface , set the link layer protocol and then the error disappears. But as predicted by Aleksander the dhcp client now refused start on wwan0.



On 10/02/2017 10:45 PM, Bjørn Mork wrote:
> Aleksander Morgado <aleksander at> writes:
>> Ah, true... then no idea why it didn't allow updating that... first
>> time I've seen this.
>> Erik, can you manually run this?
>> $ sudo -s
>> # echo Y > /sys/class/net/wwan0/qmi/raw_ip
> The driver will refuse to change mode if the netdev is running.  I.e. if
> the interface is up.  It should log an error and the write should return
> -EBUSY in this case.
> The driver will also notify other drivers of the upcoming type change,
> allowing them to block it.  This will prevent mode change if you have
> added the wwanX device to a bridge for example (which isn't a good idea
> for a raw ip device).  The sysfs write should still return an
> appropriate error code.
> Bjørn

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