linux-kernel - Re: [PATCH] tty: replace mutex_lock() with tty_write

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Message-ID: <528F112B.4090404@bfs.de>
Date:	Fri, 22 Nov 2013 09:09:15 +0100
From:	walter harms <wharms@....de>
To:	Andreas Platschek <andi.platschek@...il.com>
CC:	gregkh@...uxfoundation.org, jslaby@...e.cz,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] tty: replace mutex_lock() with tty_write_lock()



Am 21.11.2013 20:12, schrieb Andreas Platschek:
> Use tty_write_lock()/tty_write_unlock() consistently.
> 
> This takes care of the following sparse warning:
> drivers/tty/tty_io.c:1169:17: warning: context imbalance in 'tty_write_message' - unexpected unlock
> 
> Signed-off-by: Andreas Platschek <andi.platschek@...il.com>
> ---
>  drivers/tty/tty_io.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
> index 3a1a01a..13dca92 100644
> --- a/drivers/tty/tty_io.c
> +++ b/drivers/tty/tty_io.c
> @@ -1165,7 +1165,7 @@ out:
>  void tty_write_message(struct tty_struct *tty, char *msg)
>  {
>  	if (tty) {
> -		mutex_lock(&tty->atomic_write_lock);
> +		tty_write_lock(tty,0);
>  		tty_lock(tty);
>  		if (tty->ops->write && !test_bit(TTY_CLOSING, &tty->flags)) {
>  			tty_unlock(tty);

i am not an expert on this but you may need to replace that tty_unlock() with tty_write_unlock().

re,
 wh
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