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From:   Brian Norris <briannorris@chromium.org>
Date:   Tue, 2 Jun 2020 13:04:26 -0700
Message-ID: <CA+ASDXPddgOvEX___unx7N2YsQctsZN+1vkwPbi8Ab_zfwFfzw@mail.gmail.com>
Subject: Re: [PATCH] wireless: ath10k: Return early in ath10k_qmi_event_server_exit()
 to avoid hard crash on reboot
To:     John Stultz <john.stultz@linaro.org>
Cc:     lkml <linux-kernel@vger.kernel.org>,
        Rakesh Pillai <pillair@qti.qualcomm.com>,
        Govind Singh <govinds@codeaurora.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Niklas Cassel <niklas.cassel@linaro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
        Amit Pundir <amit.pundir@linaro.org>,
        Kalle Valo <kvalo@codeaurora.org>,
        ath10k <ath10k@lists.infradead.org>,
        Sibi Sankar <sibis@codeaurora.org>
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On Tue, Jun 2, 2020 at 12:40 PM John Stultz <john.stultz@linaro.org> wrote:
> On Tue, Jun 2, 2020 at 12:16 PM Brian Norris <briannorris@chromium.org> wrote:
> > On Mon, Jun 1, 2020 at 10:25 PM John Stultz <john.stultz@linaro.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).

Brian