linux-kernel - Re: patch "TTY: remove tty

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Message-ID: <4E53F282.10908@suse.cz>
Date:	Tue, 23 Aug 2011 20:33:38 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	gregkh@...e.de
CC:	alan@...ux.intel.com, arnd@...db.de,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: patch "TTY: remove tty_locked" added to tty tree

On 08/23/2011 07:36 PM, gregkh@...e.de wrote:
> diff --git a/include/linux/tty.h b/include/linux/tty.h
> index 44bc0c5..6d5eceb 100644
> --- a/include/linux/tty.h
> +++ b/include/linux/tty.h
> @@ -600,8 +600,6 @@ extern long vt_compat_ioctl(struct tty_struct *tty,
>  /* functions for preparation of BKL removal */
>  extern void __lockfunc tty_lock(void) __acquires(tty_lock);
>  extern void __lockfunc tty_unlock(void) __releases(tty_lock);
> -extern struct task_struct *__big_tty_mutex_owner;
> -#define tty_locked()		(current == __big_tty_mutex_owner)

It looks like I need tty_locked to fix system stalls in
tty_wait_until_sent in the end. Like with the patch attached. But if
someone finds another way to fix this in short-term, it would be great.

thanks,
-- 
js
suse labs

View attachment "0001-TTY-fix-stalls-on-BTM-when-waiting-until-sent.patch" of type "text/x-patch" (1376 bytes)