linux-kernel - Re: [PATCH] drivers: video: omap2: dss: Use PTR

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Date:	Wed, 20 Mar 2013 18:59:19 +0200
From:	Tomi Valkeinen <tomi.valkeinen@...com>
To:	Jon Hunter <jon-hunter@...com>
CC:	Alexandru Gheorghiu <gheorghiuandru@...il.com>,
	Florian Tobias Schandinat <FlorianSchandinat@....de>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drivers: video: omap2: dss: Use PTR_RET function

On 2013-03-20 17:44, Jon Hunter wrote:
> 
> On 03/20/2013 06:56 AM, Tomi Valkeinen wrote:
>> On 2013-03-19 10:03, Alexandru Gheorghiu wrote:
>>> Use PTR_RET function instead of IS_ERR and PTR_ERR.
>>> Patch found using coccinelle.
>>>
>>> Signed-off-by: Alexandru Gheorghiu <gheorghiuandru@...il.com>
>>> ---
>>>  drivers/video/omap2/dss/core.c |    5 +----
>>>  1 file changed, 1 insertion(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/video/omap2/dss/core.c b/drivers/video/omap2/dss/core.c
>>> index f8779d4..60cc6fe 100644
>>> --- a/drivers/video/omap2/dss/core.c
>>> +++ b/drivers/video/omap2/dss/core.c
>>> @@ -181,10 +181,7 @@ int dss_debugfs_create_file(const char *name, void (*write)(struct seq_file *))
>>>  	d = debugfs_create_file(name, S_IRUGO, dss_debugfs_dir,
>>>  			write, &dss_debug_fops);
>>>  
>>> -	if (IS_ERR(d))
>>> -		return PTR_ERR(d);
>>> -
>>> -	return 0;
>>> +	return PTR_RET(d);
>>>  }
>>>  #else /* CONFIG_OMAP2_DSS_DEBUGFS */
>>>  static inline int dss_initialize_debugfs(void)
>>>
>>
>> Thanks. I'll apply to omapdss tree.
> 
> Is this correct? If debugfs_create_file() returns a valid pointer, then
> now dss_debugfs_create_file() will return a non-zero value on success. I
> don't think this is what you want. A similar case came up recently here [1].

Hmm. I don't follow. And I don't understand the post where you referred.

PTR_RET is defined as:

if (IS_ERR(ptr))
        return PTR_ERR(ptr);
else
        return 0;

How's that different from the original code?

 Tomi



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