Re: [PATCH] wireless: ath10k: Return early in ath10k_qmi_event_server_exit() to avoid hard crash on reboot

[John Stultz]

On Tue, Jun 2, 2020 at 12:16 PM Brian Norris <briannorris@xxxxxxxxxxxx> wrote:
>
> + Sibi
>
> On Mon, Jun 1, 2020 at 10:25 PM John Stultz <john.stultz@xxxxxxxxxx> wrote:
> >
> > Ever since 5.7-rc1, if we call
> > ath10k_qmi_remove_msa_permission(), the db845c hard crashes on
> > reboot, resulting in the device getting stuck in the usb crash
> > debug mode and not coming back up wihthout a hard power off.
> >
> > This hack avoids the issue by returning early in
> > ath10k_qmi_event_server_exit().
> >
> > A better solution is very much desired!
>
> Any chance you can bisect what caused this? There are a lot of
> non-ath10k pieces involved in this stuff.

Amit had spent some work on chasing it down to the in kernel qrtr-ns
work, and reported it here:
  https://lists.infradead.org/pipermail/ath10k/2020-April/014970.html

But that discussion seemingly stalled out, so I came up with this hack
to workaround it for us.

thanks
-john