Re: ACM USB modem on Kernel 2.6.0-test

[Peter Matthias <espi@epost.de>]

David Brownell schrieb:

>>>> In fact, here's a patch with that very change.  Does
>>>> it make current 2.6.0-test kernels work "out of the box"
>>>> again with your USB modems?
>>> 
>>> Yes, it works with ELSA Microlink USB. Thanks.
>> 
>> Hmm. Too early. I get either a "acm: probe of 3-3:2.1 failed with error
-5"
>> but it works or a 
>> Unable to handle kernel NULL pointer dereference at virtual address
00000008
>>  ...
>>  EIP:    0060:[usb_driver_claim_interface+67/112]    Tainted: P
>>  ...
> 
> Well, the "it works at all (without the sysfs write)" is
> what that patch was about -- so it's still a clear win!
> 
> But cdc-acm probe() is pretty broken, and I'm told it's
> had strange behavior in various other cases for a while,
> including some oopsing.  Like this; not a new bug.
> 
> Try this cdc-acm patch.  One user reported that it made
> oopsing go away, the bogus probe() errors stopped, and
> even the /proc/bus/usb/devices listings were finally
> right (both interfaces now claimed by cdc_acm).  Plus
> it should stop the pointless hotplugging of "cdc_acm"
> for Ethernet devices (including MSFT's RNDIS).

Yes, it works. I hope it will be integrated in 2.6.0.

Peter