linux-kernel - Re: [patch 33/39] power: reset: ltc2952: Remove bogus hrtimer

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Date:	Tue, 14 Apr 2015 23:38:28 +0200
From:	Frans Klaver <frans.klaver@...ns.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Marcelo Tosatti <mtosatt@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	RenÃ© Moll <linux@...oll.nl>,
	Wolfram Sang <wsa@...-dreams.de>, <linux-pm@...r.kernel.org>
Subject: Re: [patch 33/39] power: reset: ltc2952: Remove bogus
 hrtimer_start() return value checks

On Tue, Apr 14, 2015 at 09:09:20PM +0000, Thomas Gleixner wrote:
> The return value of hrtimer_start() tells whether the timer was
> inactive or active already when hrtimer_start() was called.
> 
> The code emits a bogus warning if the timer was active already
> claiming that the timer could not be started.
> 
> Remove it.

Thanks for catching this.

> Cc: "RenÃ© Moll" <Rene.Moll@...ns.com>

Rene no longer works at Xsens, so this address is no longer in use. Instead:

Cc: "René Moll" <linux@...oll.nl>

That said, I'm not sure if he's actively monitoring this mailbox, or
even if he should still be mentioned as maintainer of this driver.


> ---
>  drivers/power/reset/ltc2952-poweroff.c |   18 +++---------------
>  1 file changed, 3 insertions(+), 15 deletions(-)
> 
> Index: tip/drivers/power/reset/ltc2952-poweroff.c
> ===================================================================
> --- tip.orig/drivers/power/reset/ltc2952-poweroff.c
> +++ tip/drivers/power/reset/ltc2952-poweroff.c
> @@ -120,18 +120,7 @@ static enum hrtimer_restart ltc2952_powe
>  
>  static void ltc2952_poweroff_start_wde(struct ltc2952_poweroff *data)
>  {
> -	if (hrtimer_start(&data->timer_wde, data->wde_interval,
> -			  HRTIMER_MODE_REL)) {
> -		/*
> -		 * The device will not toggle the watchdog reset,
> -		 * thus shut down is only safe if the PowerPath controller
> -		 * has a long enough time-off before triggering a hardware
> -		 * power-off.
> -		 *
> -		 * Only sending a warning as the system will power-off anyway
> -		 */
> -		dev_err(data->dev, "unable to start the timer\n");
> -	}
> +	hrtimer_start(&data->timer_wde, data->wde_interval, HRTIMER_MODE_REL);
>  }
>  
>  static enum hrtimer_restart
> @@ -165,9 +154,8 @@ static irqreturn_t ltc2952_poweroff_hand
>  	}
>  
>  	if (gpiod_get_value(data->gpio_trigger)) {
> -		if (hrtimer_start(&data->timer_trigger, data->trigger_delay,
> -				  HRTIMER_MODE_REL))
> -			dev_err(data->dev, "unable to start the wait timer\n");
> +		hrtimer_start(&data->timer_trigger, data->trigger_delay,
> +			      HRTIMER_MODE_REL);
>  	} else {
>  		hrtimer_cancel(&data->timer_trigger);
>  		/* omitting return value check, timer should have been valid */

You might as well remove this bogus comment along with the rest.
hrtimer_cancel()s return value says nothing about the validity of the
passed timer.

In any case

Acked-by: Frans Klaver <frans.klaver@...ns.com>

Thanks,
Frans
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