linux-kernel - Re: [PATCH] video: fbdev: imxfb: Fix an error message

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Date:   Fri, 7 May 2021 09:11:19 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Cc:     s.hauer@...gutronix.de, kernel@...gutronix.de, shawnguo@...nel.org,
        festevam@...il.com, linux-imx@....com, j.beisert@...gutronix.de,
        krzysztof.h1@...zta.fm, linux-fbdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] video: fbdev: imxfb: Fix an error message

Le 07/05/2021 à 07:05, Uwe Kleine-König a écrit :
> Hello Christophe,
> 
> On Thu, May 06, 2021 at 08:57:05PM +0200, Christophe JAILLET wrote:
>> 'ret' is known to be 0 here.
>> No error code is available, so just remove it from the error message.
>>
>> Fixes: 72330b0eeefc ("i.MX Framebuffer: Use readl/writel instead of direct pointer deref")
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>> ---
>>   drivers/video/fbdev/imxfb.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/video/fbdev/imxfb.c b/drivers/video/fbdev/imxfb.c
>> index 7f8debd2da06..ad598257ab38 100644
>> --- a/drivers/video/fbdev/imxfb.c
>> +++ b/drivers/video/fbdev/imxfb.c
>> @@ -992,7 +992,7 @@ static int imxfb_probe(struct platform_device *pdev)
>>   	info->screen_buffer = dma_alloc_wc(&pdev->dev, fbi->map_size,
>>   					   &fbi->map_dma, GFP_KERNEL);
>>   	if (!info->screen_buffer) {
>> -		dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret);
>> +		dev_err(&pdev->dev, "Failed to allocate video RAM\n");
>>   		ret = -ENOMEM;
>>   		goto failed_map;
>>   	}
> 
> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> 
> Are you using this driver, or did you find that problem using some
> static checker?
> 

No, I'm not using this driver AFAIK.

It has been spotted by coccinelle with a hand-made script which tries to 
find places where error code is used before being initialized.

The script in it-self is not really interesting. It is easy to write and 
my own version trigger way to much false positives.

CJ

> Best regards
> Uwe
>