linux-kernel - Re: [PATCH v2] ath10k: skip ath10k_halt during suspend for driver state RESTARTING

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Date:   Tue, 26 Apr 2022 22:20:26 -0700
From:   Abhishek Kumar <kuabhs@...omium.org>
To:     Brian Norris <briannorris@...omium.org>
Cc:     kvalo@...nel.org, quic_wgong@...cinc.com,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        linux-wireless <linux-wireless@...r.kernel.org>,
        ath10k <ath10k@...ts.infradead.org>,
        "<netdev@...r.kernel.org>" <netdev@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Subject: Re: [PATCH v2] ath10k: skip ath10k_halt during suspend for driver
 state RESTARTING

On Tue, Apr 26, 2022 at 3:34 PM Brian Norris <briannorris@...omium.org> wrote:
>
> On Tue, Apr 26, 2022 at 3:20 PM Abhishek Kumar <kuabhs@...omium.org> wrote:
> >
> > Double free crash is observed when FW recovery(caused by wmi
> > timeout/crash) is followed by immediate suspend event. The FW recovery
> > is triggered by ath10k_core_restart() which calls driver clean up via
> > ath10k_halt(). When the suspend event occurs between the FW recovery,
> > the restart worker thread is put into frozen state until suspend completes.
> > The suspend event triggers ath10k_stop() which again triggers ath10k_halt()
> > The double invocation of ath10k_halt() causes ath10k_htt_rx_free() to be
> > called twice(Note: ath10k_htt_rx_alloc was not called by restart worker
> > thread because of its frozen state), causing the crash.
> ...
> > Tested-on: QCA6174 hw3.2 PCI WLAN.RM.4.4.1-00288-QCARMSWPZ-1
> > Co-developed-by: Wen Gong <quic_wgong@...cinc.com>
> > Signed-off-by: Wen Gong <quic_wgong@...cinc.com>
> > Signed-off-by: Abhishek Kumar <kuabhs@...omium.org>
> > ---
> >
> > Changes in v2:
> > - Fixed typo, replaced ath11k by ath10k in the comments.
> > - Adjusted the position of my S-O-B tag.
> > - Added the Tested-on tag.
>
> You could have retained my:
>
> Reviewed-by: Brian Norris <briannorris@...omium.org>
>
> but no worries; it's just a few characters ;)
Oh! sorry about that, I was under the impression that if the next
iteration is posted, then I cannot just add the Reviewed-by tag
provided in the previous iteration by myself.