linux-kernel - Re: [Patch] UML: Fix inconsistence due to tty

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Date:	Fri, 2 May 2008 12:31:52 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	WANG Cong <xiyou.wangcong@...il.com>
Cc:	linux-kernel@...r.kernel.org, jdike@...toit.com,
	user-mode-linux-devel@...ts.sourceforge.net,
	akpm@...ux-foundation.org, Alan Cox <alan@...hat.com>
Subject: Re: [Patch] UML: Fix inconsistence due to tty_operation change

[ Alan as tty maintainer added to Cc ]

On Fri, May 02, 2008 at 02:59:46PM +0800, WANG Cong wrote:
>
> 'put_char' of 'struct tty_operations' has changed from 'void' into 'int'.
> This can also shut up comipler warnings.

Not only, this could also be a runtime error.

> Cc: Jeff Dike <jdike@...toit.com>
> Signed-off-by: WANG Cong <wangcong@...ux.org>
>
> ---
>
> diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
> index 10b86e1..5047490 100644
> --- a/arch/um/drivers/line.c
> +++ b/arch/um/drivers/line.c
> @@ -191,9 +191,9 @@ void line_flush_chars(struct tty_struct *tty)
>  	line_flush_buffer(tty);
>  }
>
> -void line_put_char(struct tty_struct *tty, unsigned char ch)
> +int line_put_char(struct tty_struct *tty, unsigned char ch)
>  {
> -	line_write(tty, &ch, sizeof(ch));
> +	return line_write(tty, &ch, sizeof(ch));
>  }
>
>  int line_write(struct tty_struct *tty, const unsigned char *buf, int len)
> diff --git a/arch/um/include/line.h b/arch/um/include/line.h
> index 1223f2c..979b73e 100644
> --- a/arch/um/include/line.h
> +++ b/arch/um/include/line.h
> @@ -71,7 +71,7 @@ extern int line_setup(struct line *lines, unsigned int sizeof_lines,
>  		      char *init, char **error_out);
>  extern int line_write(struct tty_struct *tty, const unsigned char *buf,
>  		      int len);
> -extern void line_put_char(struct tty_struct *tty, unsigned char ch);
> +extern int line_put_char(struct tty_struct *tty, unsigned char ch);
>  extern void line_set_termios(struct tty_struct *tty, struct ktermios * old);
>  extern int line_chars_in_buffer(struct tty_struct *tty);
>  extern void line_flush_buffer(struct tty_struct *tty);

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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