linux-kernel - Re: [PATCH] fujitsu-laptop: remove unnecessary input_free

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Date:	Thu, 1 Jul 2010 23:20:00 -0700
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Axel Lin <axel.lin@...il.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Jonathan Woithe <jwoithe@...sics.adelaide.edu.au>,
	Matthew Garrett <mjg@...hat.com>,
	Len Brown <len.brown@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Stefani Seibold <stefani@...bold.net>,
	Andi Kleen <ak@...ux.intel.com>,
	platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH] fujitsu-laptop: remove unnecessary input_free_device
 calls

Hi Axel,

On Fri, Jul 02, 2010 at 09:42:57AM +0800, Axel Lin wrote:
> input_free_device should only be used if input_register_device()
> was not called yet or if it failed.
> This patch removes unnecessary input_free_device calls.
> 
> Signed-off-by: Axel Lin <axel.lin@...il.com>
> ---
>  drivers/platform/x86/fujitsu-laptop.c |   21 ++++++++-------------
>  1 files changed, 8 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
> index e325aeb..dab1a0e 100644
> --- a/drivers/platform/x86/fujitsu-laptop.c
> +++ b/drivers/platform/x86/fujitsu-laptop.c
> @@ -686,8 +686,10 @@ static int acpi_fujitsu_add(struct acpi_device *device)
>  	set_bit(KEY_UNKNOWN, input->keybit);
>  
>  	error = input_register_device(input);
> -	if (error)
> -		goto err_free_input_dev;
> +	if (error) {
> +		input_free_device(input);
> +		goto err_stop;
> +	}

Instead of using mixed in-line and goto style cleanup I prefer doig the
following:

 err_unregister_input_dev:
	input_unregister_device(input);
	input = NULL; <-- !!!
 err_free_input_dev:
	input_free_device(input);

input_free_device() happily accepts NULL pointers.

Otherwise the patch looks good.

Thanks.

-- 
Dmitry
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