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Date: Sat, 14 Dec 2013 13:44:09 -0800
From: Greg KH <gregkh@linuxfoundation.org>
To: Colin Cross <ccross@android.com>
Cc: John Stultz <john.stultz@linaro.org>, LKML <linux-kernel@vger.kernel.org>,
        Android Kernel Team <kernel-team@android.com>,
        Sumit Semwal <sumit.semwal@linaro.org>,
        Jesse Barker <jesse.barker@arm.com>,
        Rebecca Schultz Zavin <rebecca@android.com>
Subject: Re: [PATCH 001/115] gpu: ion: Add ION Memory Manager
Message-ID: <20131214214409.GA26816@kroah.com>
References: <1386973529-4884-1-git-send-email-john.stultz@linaro.org>
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 <20131214165257.GA25393@kroah.com>
 <CAMbhsRRrE7m_aQRS-BB-4Jr8m0WaSADjek=tPfTu2uMoZTaXxA@mail.gmail.com>
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On Sat, Dec 14, 2013 at 01:10:38PM -0800, Colin Cross wrote:
> On Sat, Dec 14, 2013 at 8:52 AM, Greg KH <gregkh@linuxfoundation.org> wrote:
> > On Fri, Dec 13, 2013 at 02:23:35PM -0800, John Stultz wrote:
> >> +     idev->debug_root = debugfs_create_dir("ion", NULL);
> >> +     if (IS_ERR_OR_NULL(idev->debug_root))
> >> +             pr_err("ion: failed to create debug files.\n");
> >
> > There's no need to check for this at all, you just printed out an error
> > message if CONFIG_DEBUGFS is not enabled, which isn't all that nice.
> >
> > Something to clean up later, no big deal now.
> 
> Patch 75/115 (ion: remove IS_ERR_OR_NULL) replaces this chunk with:
>         idev->debug_root = debugfs_create_dir("ion", NULL);
>         if (!idev->debug_root)
>                 pr_err("ion: failed to create debug files.\n");
> which won't print an error if debugfs is disabled.

If debugfs is disabled, debugfs_create_dir() returns ERR_PTR(-ENODEV).

So are you sure you tested this?  :)