linux-kernel - Re: Regression in v5.0-rc1 with autosuspend hrtimers

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Date:   Tue, 8 Jan 2019 17:51:24 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        LAK <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org
Subject: Re: Regression in v5.0-rc1 with autosuspend hrtimers

* Vincent Guittot <vincent.guittot@...aro.org> [190109 01:42]:
> Le Tuesday 08 Jan 2019 à 13:37:43 (-0800), Tony Lindgren a écrit :
> > Lowering the autosuspend_delay_ms to 2100 ms makes things work again.
> > Anything higher than 2200 ms seems to somehow time out immediately
> > now :)
> 
> This is quite close to the max ns of an int on arm 32bits
> 
> Could you try the patch below ?

Yup great thanks, that's it:

Tested-by: Tony Lindgren <tony@...mide.com>

> ---
>  drivers/base/power/runtime.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
> index 7062469..44c5c76 100644
> --- a/drivers/base/power/runtime.c
> +++ b/drivers/base/power/runtime.c
> @@ -141,7 +141,7 @@ u64 pm_runtime_autosuspend_expiration(struct device *dev)
>  
>  	last_busy = READ_ONCE(dev->power.last_busy);
>  
> -	expires = last_busy + autosuspend_delay * NSEC_PER_MSEC;
> +	expires = last_busy + (u64)(autosuspend_delay) * NSEC_PER_MSEC;
>  	if (expires <= now)
>  		expires = 0;	/* Already expired. */
>  
> -- 
> 2.7.4
> 
> 
> > 
> > Regards,
> > 
> > Tony