linux-kernel - Re: [PATCH v2] dell-laptop: Add debugfs support

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Message-ID: <AANLkTi=xFLaFbFQrRFQop2wtkHt0-oAcTrvMGvc3g9hD@mail.gmail.com>
Date:	Fri, 17 Sep 2010 13:47:26 +0800
From:	Keng-Yü Lin <keng-yu.lin@...onical.com>
To:	Len Brown <lenb@...nel.org>
Cc:	mjg59@...f.ucam.org, len.brown@...el.com,
	alan-jenkins@...fmail.co.uk, superm1@...ntu.com,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dell-laptop: Add debugfs support

On Fri, Sep 17, 2010 at 12:46 AM, Len Brown <lenb@...nel.org> wrote:
>
>> +#ifdef CONFIG_DEBUG_FS
>
> Looks like you can delete these.
>
> Of course you'd want to properly check the return value
> from debugfs_create_dir(), which returns an ERR_PTR
> when CONFIG_DEBUG_FS is not defined. (even though
> few in the kernel seem to be bothering to use IS_ERR() here.)
>
> cheers,
> Len Brown, Intel Open Source Technology Center
>

Hi Len:
  If CONFIG_DEBUG_FS is not defined, all debugfs_create_dir(),
debugfs_create_file() and debugfs_remove_recursive() here will just
return -ENODEV. I think in this case, it causes little harm just to
skip checking the return value with IS_ERR() since no follow-up action
for that.

  Regards,
-kengyu
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