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

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Message-ID: <YaLaH3Yt2M/Gko//@qmqm.qmqm.pl>
Date:   Sun, 28 Nov 2021 02:23:43 +0100
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
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Subject: Re: [PATCH v4 22/25] memory: emif: Use kernel_can_power_off()

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.

Best Regards
Michał Mirosław