Issue with finding net port for a MBIM modem

[Aleksander Morgado]

>> > > > But now I wonder, maybe we could just remove the whole block? Is
>> > > > there
>> > > > any case nowadays were we don't get port event removals? If this
>> > > > was a
>> > > > hack for a bug in kernel 2.6.31, maybe we could consider it
>> > > > already
>> > > > obsoleted?
>> > >
>> > >
>> > >
>> > > Yeah, this comes from an old commit
>> > > 53af144f49b0d81bd4dc1f5ee9eea6d61ccae992
>> > > (udev: handle removal of parent usb devices) dated back to 2009,
>> > > which seems
>> > > to imply that the kernel doesn't remove the tty when the usb device
>> > > is
>> > > removed. I guess it's probably not hard to reproduce the steps, but
>> > > I'm not
>> > > sure if the original fix was related to a particular kernel version
>> > > or a
>> > > particular devices or a combination of both.
>> > >
>> >
>> > Dan, what do you think?
>> >
>> > From my POV, I would nuke that device removal logic right away now...
>>
>> I'll have to think about that one, but I'm on vacation all this coming
>> week so I might not have a reply soon.  IIRC it may have been related
>> to before the tty subsystem was fully sysfs/kevent ported.  I think we
>> could be reasonably sure about it if we test a bunch of old modems with
>> the block removed.
>
>
> Aleksander, in the meantime, should I submit a patch to guard this block of
> code with a check DEVTYPE==usb_device? That would at least address the issue
> I observed on my Huawei modem. WDYT?
>

Yes, this is something we can do, and would also be a safe update for
stable branches.

-- 
Aleksander
https://aleksander.es