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

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Message-ID: <be0c74c6-05a9-cad5-c285-6626d05f8860@gmail.com>
Date:   Sun, 7 Nov 2021 19:53:00 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
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Subject: Re: [PATCH v2 27/45] mfd: ntxec: Use devm_register_power_handler()

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.