linux-kernel - Re: [PATCH v4 22/25] memory: emif: Use kernel_can_power

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Message-ID: <98c5c3d3-1635-3a06-b57f-8facd409796a@gmail.com>
Date:   Mon, 29 Nov 2021 00:04:43 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
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Subject: Re: [PATCH v4 22/25] memory: emif: Use kernel_can_power_off()

28.11.2021 04:23, Michał Mirosław пишет:
> On Fri, Nov 26, 2021 at 09:00:58PM +0300, Dmitry Osipenko wrote:
>> Replace legacy pm_power_off with kernel_can_power_off() helper that
>> is aware about chained power-off handlers.
>>
>> Signed-off-by: Dmitry Osipenko <digetx@...il.com>
>> ---
>>  drivers/memory/emif.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/memory/emif.c b/drivers/memory/emif.c
>> index 762d0c0f0716..cab10d5274a0 100644
>> --- a/drivers/memory/emif.c
>> +++ b/drivers/memory/emif.c
>> @@ -630,7 +630,7 @@ static irqreturn_t emif_threaded_isr(int irq, void *dev_id)
>>  		dev_emerg(emif->dev, "SDRAM temperature exceeds operating limit.. Needs shut down!!!\n");
>>  
>>  		/* If we have Power OFF ability, use it, else try restarting */
>> -		if (pm_power_off) {
>> +		if (kernel_can_power_off()) {
>>  			kernel_power_off();
>>  		} else {
>>  			WARN(1, "FIXME: NO pm_power_off!!! trying restart\n");
> 
> BTW, this part of the code seems to be better moved to generic code that
> could replace POWER_OFF request with REBOOT like it is done for reboot()
> syscall.

Not sure that it can be done. Somebody will have to verify that it won't
break all those platform power-off handlers. Better to keep this code
as-is in the context of this patchset.