linux-kernel - Re: [PATCH 1/1] __init setup_early

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Message-ID: <52E6E4AE.4040906@gmx.de>
Date:	Mon, 27 Jan 2014 23:58:54 +0100
From:	Heinrich Schuchardt <xypron.glpk@....de>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	gxt@...c.pku.edu.cn, paul.gortmaker@...driver.com,
	vapier@...too.org, totglx@...utronix.de,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] __init setup_early_printk: missing initialization

On 27.01.2014 22:49, Andrew Morton wrote:
> On Mon, 27 Jan 2014 19:10:24 +0100 xypron.glpk@....de wrote:
>
>> From: Heinrich Schuchardt <xypron.glpk@....de>
>>
>> If is based on uninitialized value keep_early.
>> This leads to unpredictable result.
>>
>> ...
>>
>> --- a/arch/unicore32/kernel/early_printk.c
>> +++ b/arch/unicore32/kernel/early_printk.c
>> @@ -35,7 +35,7 @@ static struct console early_ocd_console = {
>>
>>   static int __init setup_early_printk(char *buf)
>>   {
>> -	int keep_early;
>> +	int keep_early = 0;
>>
>>   	if (!buf || early_console)
>>   		return 0;
>
> yup.
>
> But that code is quite overcooked.  How about this?
>
> --- a/arch/unicore32/kernel/early_printk.c~arch-unicore32-kernel-early_printkc-setup_early_printk-missing-initialization-fix
> +++ a/arch/unicore32/kernel/early_printk.c
> @@ -35,17 +35,11 @@ static struct console early_ocd_console
>
>   static int __init setup_early_printk(char *buf)
>   {
> -	int keep_early = 0;
> -
>   	if (!buf || early_console)
>   		return 0;
>
> -	if (strstr(buf, "keep"))
> -		keep_early = 1;
> -
>   	early_console = &early_ocd_console;
> -
> -	if (keep_early)
> +	if (strstr(buf, "keep"))
>   		early_console->flags &= ~CON_BOOT;
>   	else
>   		early_console->flags |= CON_BOOT;
> _
>
>

Your code is easier to read, and has same functionality.
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