linux-kernel - Re: [PATCH] hp-wmi: add return value checking for input_allocate

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Date:	Tue, 6 Jul 2010 09:56:45 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	Axel Lin <axel.lin@...il.com>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	Matthew Garrett <mjg@...hat.com>,
	Len Brown <len.brown@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frans Pop <elendil@...net.nl>,
	Anisse Astier <anisse@...ier.eu>,
	platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH] hp-wmi: add return value checking for input_allocate_device()

Hi,

it's incredible how much cleanups and fixes you find in this
handful of drivers... It's very much appreciated!

On Tuesday 06 July 2010 04:30:26 Axel Lin wrote:
> Add error checking and return -ENOMEM if input_allocate_device() fail.
> 
> Signed-off-by: Axel Lin <axel.lin@...il.com>
> ---
>  drivers/platform/x86/hp-wmi.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/platform/x86/hp-wmi.c b/drivers/platform/x86/hp-wmi.c
> index 51c07a0..c508e20 100644
> --- a/drivers/platform/x86/hp-wmi.c
> +++ b/drivers/platform/x86/hp-wmi.c
> @@ -402,6 +402,8 @@ static int __init hp_wmi_input_setup(void)
>  	int err;
>  
>  	hp_wmi_input_dev = input_allocate_device();
> +	if (!hp_wmi_input_dev)
> +		return -ENOMEM;
>  
>  	hp_wmi_input_dev->name = "HP WMI hotkeys";
>  	hp_wmi_input_dev->phys = "wmi/input0";
But also hp_wmi_input_setup() call should get checked and if it
fails, the previous wmi_install_notify_handler() must get uninstalled
again. Hm, probably the whole driver shouldn't load then and
the error code from hp_wmi_input_setup() can be returned in
hp_wmi_init(void).

Do you mind to incorporate above if you agree.

Thanks,

   Thomas
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