[Letux-kernel] hso madness

[Andreas Kemnade]

Hi,

On Sat, 15 Apr 2017 13:59:19 +0200
Andreas Kemnade <andreas at kemnade.info> wrote:

> 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.

known good 4.3
known bad 4.7

ouch. With all these horrible (with big musb bugs) kernels in between
them. 

Regards,
Andreas
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