linux-kernel - Re: [PATCH v2 1/2] staging: wilc1000: fix error handling in wilc_debugfs

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Date:	Sat, 25 Jun 2016 22:43:33 +0100
From:	Luis de Bethencourt <luisbg@....samsung.com>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	linux-wireless@...r.kernel.org, chris.park@...el.com,
	austin.shin@...el.com, johnny.kim@...el.com,
	julian.calaby@...il.com, tony.cho@...el.com, leo.kim@...el.com
Subject: Re: [PATCH v2 1/2] staging: wilc1000: fix error handling in wilc_debugfs_init()

On 25/06/16 22:36, Greg KH wrote:
> On Thu, Jun 23, 2016 at 01:36:17PM +0100, Luis de Bethencourt wrote:
>> The common format to check if a function returned an error pointer is to
>> use PTR_ERR(). Instead of ERR_PTR() which is used to return said errors.
>>
>> Signed-off-by: Luis de Bethencourt <luisbg@....samsung.com>
>> Reviewed-by: Julian Calaby <julian.calaby@...il.com>
>> ---
>>  drivers/staging/wilc1000/wilc_debugfs.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/wilc1000/wilc_debugfs.c b/drivers/staging/wilc1000/wilc_debugfs.c
>> index fcbc95d..48797dc 100644
>> --- a/drivers/staging/wilc1000/wilc_debugfs.c
>> +++ b/drivers/staging/wilc1000/wilc_debugfs.c
>> @@ -107,7 +107,7 @@ static int __init wilc_debugfs_init(void)
>>  	struct wilc_debugfs_info_t *info;
>>  
>>  	wilc_dir = debugfs_create_dir("wilc_wifi", NULL);
>> -	if (wilc_dir ==  ERR_PTR(-ENODEV)) {
>> +	if (PTR_ERR(wilc_dir) == -ENODEV) {
>>  		/* it's not error. the debugfs is just not being enabled. */
>>  		printk("ERR, kernel has built without debugfs support\n");
>>  		return 0;
> 
> No, the best way to do this is to just ignore the return value, you
> don't care about it.  It can be passed back into any debugfs calls just
> fine.
> 
> So don't check the value and all is good, debugfs was written in a way
> to make it _easy_ to use, no need for fancy error checking at all with
> it.
> 
> thanks,
> 
> greg k-h
> 

Thanks for the review Greg.

Just to make sure. You are proposing I just drop the 3 if checks? [0]

If that's what you mean I will send a patch as soon as you confirm :)

Happy hacking,
Luis



[0] Making the function look like this:
static int __init wilc_debugfs_init(void)
{
        int i;

        struct dentry *debugfs_files;
        struct wilc_debugfs_info_t *info;

        wilc_dir = debugfs_create_dir("wilc_wifi", NULL);
        for (i = 0; i < ARRAY_SIZE(debugfs_info); i++) {
                info = &debugfs_info[i];
                debugfs_files = debugfs_create_file(info->name,
                                                    info->perm,
                                                    wilc_dir,
                                                    &info->data,
                                                    &info->fops);
        }
        return 0;
}