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

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Date:	Fri, 22 Jul 2016 23:52:56 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	linux-pm@...r.kernel.org, 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

On Friday, July 22, 2016 10:35:27 PM SF Markus Elfring wrote:
> 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?

I'm not really sure what you mean.

Thanks,
Rafael