linux-kernel - Re: [PATCH v2 27/45] mfd: ntxec: Use devm_register_power

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Date:   Sun, 7 Nov 2021 09:08:11 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Dmitry Osipenko <digetx@...il.com>,
        Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Lee Jones <lee.jones@...aro.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
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Subject: Re: [PATCH v2 27/45] mfd: ntxec: Use devm_register_power_handler()

On 11/7/21 8:53 AM, Dmitry Osipenko wrote:
> 06.11.2021 23:54, Jonathan Neuschäfer пишет:
>> Hi,
>>
>> On Thu, Oct 28, 2021 at 12:16:57AM +0300, Dmitry Osipenko wrote:
>>> Use devm_register_power_handler() that replaces global pm_power_off
>>> variable and allows to register multiple power-off handlers. It also
>>> provides restart-handler support, i.e. all in one API.
>>>
>>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>>> ---
>>
>> When I boot with (most of) this patchset applied, I get the warning at
>> kernel/reboot.c:187:
>>
>> 	/*
>> 	 * Handler must have unique priority. Otherwise call order is
>> 	 * determined by registration order, which is unreliable.
>> 	 */
>> 	WARN_ON(!atomic_notifier_has_unique_priority(&restart_handler_list, nb));
>>
>> As the NTXEC driver doesn't specify a priority, I think this is an issue
>> to be fixed elsewhere.
>>
>> Other than that, it works and looks good, as far as I can tell.
>>
>>
>> For this patch:
>>
>> Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@....net>
>> Tested-by: Jonathan Neuschäfer <j.neuschaefer@....net>
> 
> Thank you. You have conflicting restart handlers, apparently NTXEC
> driver should have higher priority than the watchdog driver. It should
> be a common problem for the watchdog drivers, I will lower watchdog's
> default priority to fix it.
> 

The watchdog subsystem already uses "0" as default priority, which was
intended as priority of last resort for restart handlers. I do not see
a reason to change that.

Guenter