From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [patch 1/5] x86: ACPI - add checking for NULL early param
Date: Tue, 22 Jul 2008 02:53:32 -0700
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To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: mingo@elte.hu, hpa@zytor.com, tglx@linutronix.de, andi@firstfloor.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.orgAndi Kleen <andi@firstfloor.org>

On Sat, 05 Jul 2008 15:53:35 +0400 Cyrill Gorcunov <gorcunov@gmail.com> wrote:

> Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
> ---
> 
> Index: linux-2.6.git/drivers/acpi/tables.c
> ====================================================================
> --- linux-2.6.git.orig/drivers/acpi/tables.c	2008-01-21 23:14:47.000000000 +0300
> +++ linux-2.6.git/drivers/acpi/tables.c	2008-07-05 12:24:16.000000000 +0400
> @@ -300,6 +300,8 @@ int __init acpi_table_init(void)
>  
>  static int __init acpi_parse_apic_instance(char *str)
>  {
> +	if (!str)
> +		return -EINVAL;
>  
>  	acpi_apic_instance = simple_strtoul(str, NULL, 0);
>  

Could you please explain this patch?