linux-kernel - Re: [PATCH 2/2] asus-laptop: remove unused variable

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Message-ID: <20160410084852.GA5473@tyrael>
Date:	Sun, 10 Apr 2016 11:48:52 +0300
From:	Giedrius Statkevičius 
	<giedrius.statkevicius@...il.com>
To:	Darren Hart <dvhart@...radead.org>
Cc:	corentin.chary@...il.com, acpi4asus-user@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] asus-laptop: remove unused variable

On Sat, Apr 09, 2016 at 08:21:21PM -0700, Darren Hart wrote:
> On Thu, Apr 07, 2016 at 11:20:01PM +0300, Giedrius Statkevičius wrote:
> > `out' was assigned value but it was never used so remove it
> > 
> > Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@...il.com>
> > ---
> >  drivers/platform/x86/asus-laptop.c | 3 ---
> >  1 file changed, 3 deletions(-)
> > 
> > diff --git a/drivers/platform/x86/asus-laptop.c b/drivers/platform/x86/asus-laptop.c
> > index d86d42e..39ddcee 100644
> > --- a/drivers/platform/x86/asus-laptop.c
> > +++ b/drivers/platform/x86/asus-laptop.c
> > @@ -946,11 +946,8 @@ static ssize_t sysfs_acpi_set(struct asus_laptop *asus,
> >  			      const char *method)
> >  {
> >  	int rv, value;
> > -	int out = 0;
> >  
> >  	rv = parse_arg(buf, count, &value);
> > -	if (rv > 0)
> > -		out = value ? 1 : 0;
> >  
> >  	if (write_acpi_int(asus->handle, method, value))
> 
> out is indeed unused, however the rv > 0 condition is relevant as <=0 will pass
> value uninitialized to write_acpi_int.
That's indeed a problem. Somehow I missed that :( Should I make a v2 to include
another patch that checks for rv < 0 or send it as an independent one?