ifconfig wwan0 : SIOCSIFFLAGS: No space left on device

IoT Modules MC/EM Series
1

Hi all,

I’m working on Sierra MC7700 on Linux 2.6.38 on my embedded board, I’m facing an issue when I connect the MC7700 through a
7 port Dlink USB Hub.
I connect the MC7700 to the Dlink USB Hub and i issue the AT commands through the busybox microcom, after I get OK for the connection, if I try to
run dhclinet on wwan0 or if I do a ifconfig wwan0 up i see the below error message:

SIOCSIFFLAGS: No space left on device

Has anyone faced this issue before?
Thanks in advance for your time!.

regards,
GK

2

Hi,

Are you running any sample application before running dhclinet on wwan0 or doing a ifconfig wwan0 up ?

Thanks.

3

Hi Rex,

Thanks for the reply.

Are you running any sample application before running dhclinet on wwan0 or doing a ifconfig wwan0 up ?
No, I’m not running any sample application,
Now I can reproduce the issue every time like this:
I insert the MC7700 to my board, the ttyUSB s get created
I run @ the shell :

busybox microcom /dev/ttyUSB3

sierra ttyUSB3: sierra_submit_rx_urbs: submit intr urb failed: -28

I get the above debug message from the sierra module :
which is actually the ENOSPC for the device on endpoint 3.

Any thoughts on this, would really appreciate any clues in finding this out.

Thanks,
GK

4

Didn’t Oliver Neukum give you the correct answer to this a month ago?
comments.gmane.org/gmane.linux.usb.general/73915

Anyway, that error comes from the HCD driver and has nothing directly to do with the Sierra device. It’s a platform thing and you do not provide any information about the platform you are using.