linux-kernel - Re: [PATCH] virtio_console: correct error message on failure of debugfs_create

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Message-ID: <20121224173937.GB14754@kroah.com>
Date:	Mon, 24 Dec 2012 09:39:37 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Amit Shah <amit.shah@...hat.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio_console: correct error message on failure of
 debugfs_create_dir

On Mon, Dec 24, 2012 at 11:55:46AM +0000, Arnd Bergmann wrote:
> On Friday 21 December 2012, Amit Shah wrote:
> > On (Thu) 20 Dec 2012 [14:11:21], Sasha Levin wrote:
> > > debugfs_create_dir() returns NULL if it fails, there's little point in
> > > calling PTR_ERR on it.
> >
> > debugfs_create_dir() does return an error value if debugfs is not
> > enabled.
> > 
> > This check for !pdrvdata.debugfs_dir should infact use
> > IS_ERR_OR_NULL().  Care to submit a patch for that?
> 
> How about we fix the stub instead to return NULL when debugfs is disabled?

No, please read debugfs.h for why I decided to not do this (i.e. we try
to learn from our mistakes...)

thanks,

greg k-h
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