Huawei E3276 problem

[Olof Ermis]

Hi!

The patch worked, it didn't call the usb_driver_claim_interface.

The echo gives:

root at oloflinux:~/linux# echo '1-1:1.1' >/sys/bus/usb/drivers/cdc_ncm/unbind
-bash: echo: write error: No such device

(when connected).

Tommy: Do you have some nice script that initiates the connection?
Linux-scripting is not my strong side, either.

Cheers
Olof


2012/11/13 Bjørn Mork <bjorn at mork.no>:
> Tommy Cheng <tommy7765 at yahoo.com> writes:
>
>> The debug output is as follows:
>>
>> # insmod /tmp/cdc_ncm.ko
>> cdc_ncm: 14-Mar-2012
>> cdc_ncm 1-1:1.1: XX: ctx->control=81eec080, ctx->data=81eec080, ctx->ether_desc=814b67c8, intf=81eec080
>> cdc_ncm 1-1:1.1: XX: failed to claim interface: -16
>> usb 1-1: bind() failure
>> usbcore: registered new interface driver cdc_ncm
>
> Thanks for testing both of you.  The return code (EBUSY) confirm the
> assumption that this fails because we already own the claimed
> interface.
>
> I just tested and found that the same patch will apply to both
> net-next/master and the current mainline because the context is
> unaltered even with the major changes we made to the driver.
>
> So I think I'll try to ask davem if this can be accepted for v3.7 and
> stable after all.
>
> Just one more question:  Does unbinding work without any further
> changes?  You can test with e.g.
>  echo '1-1:1.1' >/sys/bus/usb/drivers/cdc_ncm/unbind
>
> I am wondering because it will attempt to release the data interface
> when unbinding from the control interface, and this may cause problems
> when they are the same.  In which case we need to put a protecting
> conditional there too.
>
>
>
> Bjørn