linux-kernel - Re: [PATCH] PM-wakeup: Delete unnecessary checks before two function calls

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Message-ID: <427a7f9d-d1c2-10be-9a23-30350ced6149@users.sourceforge.net>
Date:	Fri, 22 Jul 2016 22:35:27 +0200
From:	SF Markus Elfring <elfring@...rs.sourceforge.net>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>, linux-pm@...r.kernel.org
Cc:	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org,
	Julia Lawall <julia.lawall@...6.fr>
Subject: Re: [PATCH] PM-wakeup: Delete unnecessary checks before two function
 calls

Am 28.06.2015 um 12:21 schrieb SF Markus Elfring:
> From: Markus Elfring <elfring@...rs.sourceforge.net>
> Date: Sun, 28 Jun 2015 12:14:43 +0200
> 
> The functions dev_pm_disarm_wake_irq() and wakeup_source_unregister() test
> whether their argument is NULL and then return immediately.
> Thus the test around the calls is not needed.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
> ---
>  drivers/base/power/wakeup.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c
> index 40f7160..3741bc2 100644
> --- a/drivers/base/power/wakeup.c
> +++ b/drivers/base/power/wakeup.c
> @@ -341,8 +341,7 @@ void device_wakeup_arm_wake_irqs(void)
>  
>  	rcu_read_lock();
>  	list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
> -		if (ws->wakeirq)
> -			dev_pm_arm_wake_irq(ws->wakeirq);
> +		dev_pm_arm_wake_irq(ws->wakeirq);
>  	}
>  	rcu_read_unlock();
>  }
> @@ -358,8 +357,7 @@ void device_wakeup_disarm_wake_irqs(void)
>  
>  	rcu_read_lock();
>  	list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
> -		if (ws->wakeirq)
> -			dev_pm_disarm_wake_irq(ws->wakeirq);
> +		dev_pm_disarm_wake_irq(ws->wakeirq);
>  	}
>  	rcu_read_unlock();
>  }
> @@ -396,9 +394,7 @@ int device_wakeup_disable(struct device *dev)
>  		return -EINVAL;
>  
>  	ws = device_wakeup_detach(dev);
> -	if (ws)
> -		wakeup_source_unregister(ws);
> -
> +	wakeup_source_unregister(ws);
>  	return 0;
>  }
>  EXPORT_SYMBOL_GPL(device_wakeup_disable);
> 

How do you think about to integrate this update suggestion
into another source code repository?

Regards,
Markus