linux-kernel - Re: [PATCH] drivers:watchdog:aspeed_wdt: using msleep instead of mdelay

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Message-ID: <7ca24742-8a82-da21-7b4c-ca807f995844@roeck-us.net>
Date:   Sun, 16 Apr 2017 12:53:28 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Karim Eshapa <karim.eshapa@...il.com>, joel@....id.au
Cc:     wim@...ana.be, linux-watchdog@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers:watchdog:aspeed_wdt: using msleep instead of
 mdelay

On 04/16/2017 09:33 AM, Karim Eshapa wrote:
> that's useful for the scheduler, power management unless
> the driver needs to delay in atomic context
> look at documentation/timers/timers-howto
>
> Signed-off-by: Karim Eshapa <karim.eshapa@...il.com>
> ---
>  drivers/watchdog/aspeed_wdt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/watchdog/aspeed_wdt.c b/drivers/watchdog/aspeed_wdt.c
> index 1c65258..17f06d1 100644
> --- a/drivers/watchdog/aspeed_wdt.c
> +++ b/drivers/watchdog/aspeed_wdt.c
> @@ -115,7 +115,7 @@ static int aspeed_wdt_restart(struct watchdog_device *wdd,
>
>  	aspeed_wdt_enable(wdt, 128 * WDT_RATE_1MHZ / 1000);
>
> -	mdelay(1000);
> +	msleep(1000);
>
>  	return 0;
>  }
>
Possibly, but how can you guarantee that the restart function is called with interrupts
enabled ? Also, why would it be necessary or even useful for the scheduler to do anything
while the system is in the process of restarting ?

Guenter