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

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Message-ID: <CA+V-a8u0RARw84FYa661VZCYpXkZYkXmtc03jCXU=t0aoGvg9Q@mail.gmail.com>
Date:	Tue, 13 Jan 2015 11:53:01 +0000
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Tomi Valkeinen <tomi.valkeinen@...com>
Cc:	LFBDEV <linux-fbdev@...r.kernel.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] fbdev: ssd1307fb: check return value while setting offset

On Tue, Jan 13, 2015 at 11:43 AM, Tomi Valkeinen <tomi.valkeinen@...com> wrote:
> 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...
>
Agreed I have just aligned this to rest of the code in this function.

Maxime if you are OK I'll post a patch returning error then and there ?

Thanks,
--Prabhakar Lad
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