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

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Date:	Fri, 21 Dec 2012 13:29:09 +0530
From:	Amit Shah <amit.shah@...hat.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	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 (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.
> 
> Signed-off-by: Sasha Levin <sasha.levin@...cle.com>
> ---
>  drivers/char/virtio_console.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
> index c594cb1..490b70e 100644
> --- a/drivers/char/virtio_console.c
> +++ b/drivers/char/virtio_console.c
> @@ -2212,10 +2212,9 @@ static int __init init(void)
>  	}
>  
>  	pdrvdata.debugfs_dir = debugfs_create_dir("virtio-ports", NULL);
> -	if (!pdrvdata.debugfs_dir) {
> -		pr_warning("Error %ld creating debugfs dir for virtio-ports\n",
> -			   PTR_ERR(pdrvdata.debugfs_dir));
> -	}
> +	if (!pdrvdata.debugfs_dir)
> +		pr_warn("Error creating debugfs dir for virtio-ports\n");

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?

		Amit
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