linux-kernel - Re: [PATCH v2 0/2] introduce watchdog_dev

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Message-ID: <CAMxfBF7tQunNenizu5U+tF8aYQdVii=o_f2VcrT5fK7t-bzaqA@mail.gmail.com>
Date:   Wed, 21 Jul 2021 09:51:02 +0200
From:   Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
To:     wim@...ux-watchdog.org, Guenter Roeck <linux@...ck-us.net>,
        shawnguo@...nel.org
Cc:     linux-watchdog@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/2] introduce watchdog_dev_suspend/resume

On Fri, 18 Jun 2021 at 21:50, Grzegorz Jaszczyk
<grzegorz.jaszczyk@...aro.org> wrote:
>
> Hi All,
>
> The following is a v2 version of the series [1] that fixes system hang which
> occurs when the ping worker fires after wdog suspend and before wdog resume.
> This happens because the ping worker can issue low-level ping while the wdog clk
> was disabled by the suspend routine (accessing hw wdog registers while they are
> not fed by the clk).
>
> To overcome this issue two patches were introduced. Patch #1 introduces pm
> notifier in the watchdog core which will call watchdog_dev_suspend/resume and
> actually cancel ping worker during suspend and restore it back, if needed,
> during resume.
>
> Patch #2 introduces relevant changes to imx2_wdt driver and notifies wdog core
> to stop ping worker on suspend.
>
> [1] https://lkml.org/lkml/2021/6/15/542
>
> Best regards,
> Grzegorz
>
> Grzegorz Jaszczyk (2):
>   watchdog: introduce watchdog_dev_suspend/resume
>   watchdog: imx2_wdg: notify wdog core to stop ping worker on suspend
>
>  drivers/watchdog/imx2_wdt.c      |  1 +
>  drivers/watchdog/watchdog_core.c | 37 +++++++++++++++++++++++++
>  drivers/watchdog/watchdog_dev.c  | 47 ++++++++++++++++++++++++++++++++
>  include/linux/watchdog.h         | 10 +++++++
>  4 files changed, 95 insertions(+)
>
> --
> 2.29.0
>

Hi,

Gentle reminder about this patch-set. Both patches were reviewed by
Guenter Roeck and are on the list for some time, I would be happy if
we could get them applied.

Thank you in advance,
Grzegorz