[Letux-kernel] hso madness

[Andreas Kemnade]

On Sat, 15 Apr 2017 11:35:09 +0200
"H. Nikolaus Schaller" <hns at goldelico.com> wrote:

> Hi,
> 
> > Am 15.04.2017 um 11:07 schrieb Andreas Kemnade <andreas at kemnade.info>:
> > 
> > Hi,
> > 
> > I just did a rfkill unblock wwan
> > and a rmmod hso afterwards -> kernel oops
> > I think hso kindly asks for a git bisect time.
> > git bisecting should be easy because there are no relevant patches
> > in that area in our tree. For testing, exporting gpio186 should be fine.
> > And even the device (and hopefully also the problem) could possibly be
> > transferred via usbip to a big computer.. The weather forecast shows
> > cold weather here, so some git bisect + kernel compile heating will be
> > helpful ;-)
> > 
> > There is also the ugly commit:
> > 
> > d073ca63156bc8badea4b7d5f455fa96bb004ee8
> > Author: H. Nikolaus Schaller <hns at goldelico.com>
> > Date:   Sat Mar 4 15:56:23 2017 +0100
> > 
> >    drivers: net: hso: hack to avoid NULL pointer dereferencing - the reason is unknown. Perhaps some race condi
> > tion in the USB stack?
> > Last known good is 4.10?
> 
> Yes... this 4.11 contains several really bad regressions or the GTA04.
> This is the reason why we still do not yet have a really useable 4.11-rc6...
> 
No, that is older. 4.10 has also the problem.
How to reproduce:
rfkill unblock wwan
rmmod hso

No accesses to tty are needed.

Regards,
Andreas
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