linux-kernel - Re: [PATCH 2/2] tty-ldisc: turn ldisc user count into a proper refcount

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Message-ID: <87d47cfz1g.fsf@devron.myhome.or.jp>
Date:	Tue, 04 Aug 2009 05:00:27 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Sergey Senozhatsky <sergey.senozhatsky@...l.by>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg KH <greg@...ah.com>
Subject: Re: [PATCH 2/2] tty-ldisc: turn ldisc user count into a proper refcount

Linus Torvalds <torvalds@...ux-foundation.org> writes:

> Whatever. The patch _looks_ sensible to me. The only users of ldisc->users 
> are:
>  - get_ldisc() - atomically increment the count
>
>  - put_ldisc() - atomically decrements the count and releases if zero
>
>  - tty_ldisc_try_get() - creates the ldisc, and sets the count to 1.
>    The ldisc should then either be released, or be attached to a tty.
>
> Comments? Testing?

This works for me. And it seems there is no refcount leak in this
shutdown case.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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