linux-kernel - Re: [PATCH] video: fbdev: uvesafb: Remove redundant NULL check in uvesafb

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Date:	Thu, 6 Mar 2014 11:31:55 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Wang YanQing <udknight@...il.com>
CC:	<plagnioj@...osoft.com>, <linux-fbdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <fengguang.wu@...el.com>
Subject: Re: [PATCH] video: fbdev: uvesafb: Remove redundant NULL check in
 uvesafb_remove

On 05/03/14 17:54, Wang YanQing wrote:
> Because uvesafb_par is allocated as part of fb_info in uvesafb_probe,
> so we don't need to do NULL check for both fb_info and uvesafb_par in
> uvesafb_remove.
> 
> [ This patch also fix a warning report by fengguang.wu@...el.com
>   "drivers/video/fbdev/uvesafb.c:1815 uvesafb_remove()
>    warn: variable dereferenced before check 'par'" ]
> 
> Signed-off-by: Wang YanQing <udknight@...il.com>
> ---
>  drivers/video/fbdev/uvesafb.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/video/fbdev/uvesafb.c b/drivers/video/fbdev/uvesafb.c
> index 1f38445..18352b2 100644
> --- a/drivers/video/fbdev/uvesafb.c
> +++ b/drivers/video/fbdev/uvesafb.c
> @@ -1812,11 +1812,9 @@ static int uvesafb_remove(struct platform_device *dev)
>  		fb_destroy_modedb(info->monspecs.modedb);
>  		fb_dealloc_cmap(&info->cmap);
>  
> -		if (par) {
> -			kfree(par->vbe_modes);
> -			kfree(par->vbe_state_orig);
> -			kfree(par->vbe_state_saved);
> -		}
> +		kfree(par->vbe_modes);
> +		kfree(par->vbe_state_orig);
> +		kfree(par->vbe_state_saved);
>  
>  		framebuffer_release(info);
>  	}
> 

Thanks, queuing for 3.15.

 Tomi



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