linux-kernel - Re: [PATCH] video: fbdev: intelfb: intelfb_i2c.c: Cleaning up variable that is never used

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Message-ID: <20140730065030.GA8024@amd.pavel.ucw.cz>
Date:	Wed, 30 Jul 2014 08:50:30 +0200
From:	Pavel Machek <pavel@....cz>
To:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Rickard Strandqvist <rickard.strandqvist@...ymobile.com>,
	Jingoo Han <jg1.han@...sung.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Rob Clark <robdclark@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] video: fbdev: intelfb: intelfb_i2c.c:  Cleaning up
 variable that is never used

On Sat 2014-07-05 14:24:08, Rickard Strandqvist wrote:
> From: Rickard Strandqvist <rickard.strandqvist@...ymobile.com>
> 
> Variable ar assigned a value that is never used.
> I have also removed all the code that thereby serves no purpose.
> 
> This was found using a static code analysis program called cppcheck

Are you sure this is the right fix?

Do we need to read the register in case we don't care about return
value?


> index 3300bd3..4df2f1f 100644
> --- a/drivers/video/fbdev/intelfb/intelfb_i2c.c
> +++ b/drivers/video/fbdev/intelfb/intelfb_i2c.c
> @@ -55,22 +55,20 @@ static void intelfb_gpio_setscl(void *data, int state)
>  {
>  	struct intelfb_i2c_chan *chan = data;
>  	struct intelfb_info *dinfo = chan->dinfo;
> -	u32 val;
>  
>  	OUTREG(chan->reg, (state ? SCL_VAL_OUT : 0) |
>  	       SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK);
> -	val = INREG(chan->reg);
> +	INREG(chan->reg);
>  }

-- 
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