linux-kernel - Re: [PATCH] video, udlfb: Fix two build warning about 'ignoring return value'

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Date:	Mon, 18 Apr 2011 18:42:17 +0800
From:	Liu Yuan <namei.unix@...il.com>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] video, udlfb: Fix two build warning about 'ignoring
 return value'

Ah, thanks for pointing it out. I'll prepare v2 patch for it.

Thanks,
Yuan

On Mon, Apr 18, 2011 at 4:46 PM, Paul Mundt <lethal@...ux-sh.org> wrote:
> On Thu, Apr 14, 2011 at 04:17:50PM +0800, Liu Yuan wrote:
>> Build warning:
>> ...
>> drivers/video/udlfb.c:1590: warning: ignoring return value of ???device_create_file???, declared with attribute warn_unused_result
>> drivers/video/udlfb.c:1592: warning: ignoring return value of ???device_create_bin_file???, declared with attribute warn_unused_result
>>
>> So add two checks to get rid of 'em.
>>
>> Signed-off-by: Liu Yuan <tailai.ly@...bao.com>
>> ---
>>  drivers/video/udlfb.c |   15 ++++++++++++---
>>  1 files changed, 12 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/video/udlfb.c b/drivers/video/udlfb.c
>> index 68041d9..55d6de6 100644
>> --- a/drivers/video/udlfb.c
>> +++ b/drivers/video/udlfb.c
>> @@ -1586,10 +1586,19 @@ static int dlfb_usb_probe(struct usb_interface *interface,
>>               goto error;
>>       }
>>
>> -     for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++)
>> -             device_create_file(info->dev, &fb_device_attrs[i]);
>> +     for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) {
>> +             retval = device_create_file(info->dev, &fb_device_attrs[i]);
>> +             if (retval) {
>> +                     pr_err("device_create_file failed %d\n", retval);
>> +                     goto error;
>> +             }
>> +     }
>>
>> -     device_create_bin_file(info->dev, &edid_attr);
>> +     retval = device_create_bin_file(info->dev, &edid_attr);
>> +     if (retval) {
>> +             pr_err("device_create_bin_file failed %d\n", retval);
>> +             goto error;
>> +     }
>>
>
> While this will get rid of the warnings, it doesn't take care of cleaning
> up the created files in the error case..
>
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