linux-kernel - Re: [PATCH] printk: Fix return of braille_register

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Date:	Mon, 05 Aug 2013 20:29:23 -0700
From:	Joe Perches <joe@...ches.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Samuel Thibault <samuel.thibault@...-lyon.org>,
	Ming Lei <ming.lei@...onical.com>
Subject: Re: [PATCH] printk: Fix return of braille_register_console()

On Mon, 2013-08-05 at 22:55 -0400, Steven Rostedt wrote:
> Some of my configs I test with have CONFIG_A11Y_BRAILLE_CONSOLE set.
> When I started testing against v3.11-rc4 my console went bonkers. Using
> ktest to bisect the issue, it came down to:
> 
> commit bbeddf52a "printk: move braille console support into separate
> braille.[ch] files"
> 
> Looking into the patch I found the problem. It's with the return of
> braille_register_console(). As anything other than NULL is considered a
> failure.
> 
> But for those of us that have CONFIG_A11Y_BRAILLE_CONSOLE set but do not
> define a "brl" or "brl=" on the command line, we still may want a
> console that those with sight can still use.
> 
> Return NULL (success) if "brl" or "brl=" is not on the console line.

Thanks Steven.

> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> 
> diff --git a/kernel/printk/braille.c b/kernel/printk/braille.c
> index b51087f..276762f 100644
> --- a/kernel/printk/braille.c
> +++ b/kernel/printk/braille.c
> @@ -19,7 +19,8 @@ char *_braille_console_setup(char **str, char **brl_options)
>  			pr_err("need port name after brl=\n");
>  		else
>  			*((*str)++) = 0;
> -	}
> +	} else
> +		return NULL;
>  
>  	return *str;
>  }
> 
> 
> 



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