From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Sat, 20 Jul 2013 21:50:48 +0000
Subject: Re: [patch] virtio: console: fix error handling for debugfs_create_dir()
Message-Id: <20130720215048.GD5636@mwanda>
List-Id: <kernel-janitors.vger.kernel.org>
References: <20130719055049.GD9729@elgon.mountain>
	<201307191228.41794.arnd@arndb.de>
In-Reply-To: <201307191228.41794.arnd@arndb.de>
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To: Arnd Bergmann <arnd@arndb.de>
Cc: Amit Shah <amit.shah@redhat.com>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, kernel-janitors@vger.kernel.org, virtualization@lists.linux-foundation.org

On Fri, Jul 19, 2013 at 12:28:41PM +0200, Arnd Bergmann wrote:
> On Friday 19 July 2013, Dan Carpenter wrote:
> > debugfs_create_dir() returns ERR_PTR(-ENODEV) if debugfs is disabled.
> > Also my static checker doesn't like it when we print the error code, but
> > it's always just NULL.
> > 
> > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
> 
> This looks wrong.  debugfs_create_dir intentionally returns non-NULL so
> failing to create the directory does not trigger an error condition if
> debugfs is disabled.
> 

Yeah.  You're right.  But the original code is still wrong and will
oops if debugfs is disabled.  We should set the pointer to NULL if
we get a ERR_PTR().

I will send a v2 patch.

regards,
dan carpenter