linux-kernel - Re: [PATCH 2/2] fbdev: ssd1307fb: check return value while setting offset

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Date:	Tue, 13 Jan 2015 13:43:43 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	"Lad, Prabhakar" <prabhakar.csengg@...il.com>,
	LFBDEV <linux-fbdev@...r.kernel.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
CC:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] fbdev: ssd1307fb: check return value while setting
 offset

On 08/01/15 10:17, Lad, Prabhakar wrote:
> this patch checks the return value of write command while
> setting the display offset.
> 
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> ---
>  drivers/video/fbdev/ssd1307fb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
> index 70e3ce8..a7ecaa6 100644
> --- a/drivers/video/fbdev/ssd1307fb.c
> +++ b/drivers/video/fbdev/ssd1307fb.c
> @@ -342,7 +342,7 @@ static int ssd1307fb_ssd1306_init(struct ssd1307fb_par *par)
>  
>  	/* set display offset value */
>  	ret = ssd1307fb_write_cmd(par->client, SSD1307FB_SET_DISPLAY_OFFSET);
> -	ret = ssd1307fb_write_cmd(par->client, 0x20);
> +	ret = ret & ssd1307fb_write_cmd(par->client, 0x20);
>  	if (ret < 0)
>  		return ret;

Hrm, what's that supposed to do? If both calls to ssd1307fb_write_cmd()
return an error, they are anded, resulting in a garbage error code...

 Tomi



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