linux-kernel - Re: [PATCH] wireless: ath10k: Return early in ath10k_qmi_event_server

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Date:   Wed, 3 Jun 2020 05:57:15 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     Brian Norris <briannorris@...omium.org>
Cc:     John Stultz <john.stultz@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Rakesh Pillai <pillair@....qualcomm.com>,
        Govind Singh <govinds@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Niklas Cassel <niklas.cassel@...aro.org>,
        Amit Pundir <amit.pundir@...aro.org>,
        Kalle Valo <kvalo@...eaurora.org>,
        ath10k <ath10k@...ts.infradead.org>,
        Sibi Sankar <sibis@...eaurora.org>
Subject: Re: [PATCH] wireless: ath10k: Return early in
 ath10k_qmi_event_server_exit() to avoid hard crash on reboot

On Tue, Jun 02, 2020 at 01:04:26PM -0700, Brian Norris wrote:
> On Tue, Jun 2, 2020 at 12:40 PM John Stultz <john.stultz@...aro.org> wrote:
> > On Tue, Jun 2, 2020 at 12:16 PM Brian Norris <briannorris@...omium.org> wrote:
> > > On Mon, Jun 1, 2020 at 10:25 PM John Stultz <john.stultz@...aro.org> 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.
> 
> If I'm reading it right, then that means we should revert this stuff
> from v5.7-rc1:
> 
> 0c2204a4ad71 net: qrtr: Migrate nameservice to kernel from userspace
> 
> At least, until people can resolve the tail end of that thread. New
> features (ath11k, etc.) are not a reason to break existing features
> (ath10k/wcn3990).

I don't agree with this. If you read through the replies to the bug report,
it is clear that NS migration uncovered a corner case or even a bug. So we
should try to fix that indeed.

Govind: Did you get chance to work on fixing this issue?

Thanks,
Mani

> 
> Brian