linux-kernel - Re: [PATCH 3/4] tty: Abstract and encapsulate tty->closing behavior

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Message-ID: <20151109091214.GD16715@sig21.net>
Date:	Mon, 9 Nov 2015 10:12:14 +0100
From:	Johannes Stezenbach <js@...21.net>
To:	Peter Hurley <peter@...leysoftware.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, netdev@...r.kernel.org,
	Karsten Keil <isdn@...ux-pingi.de>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Mikael Starvik <starvik@...s.com>,
	Jiri Kosina <jikos@...nel.org>,
	David Sterba <dsterba@...e.com>,
	Mark Hounschell <markh@...pro.net>
Subject: Re: [PATCH 3/4] tty: Abstract and encapsulate tty->closing behavior

On Sun, Nov 08, 2015 at 05:02:52PM -0500, Peter Hurley wrote:
> +void tty_ldisc_closing(struct tty_struct *tty)
> +{
> +	struct tty_ldisc *ld = tty_ldisc_ref(tty);
> +
> +	if (ld->ops->closing)
> +		ld->ops->closing(tty);
> +	if (ld)
> +		tty_ldisc_deref(ld);
> +}

That looks strange.  Do you need to check ld _before_ dereferencing?

Johannes
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