linux-kernel - Re: [RFC PATCH 4/5] hvc_console: Add tty window resizing

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Date:	Tue, 14 Oct 2008 10:44:28 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
Cc:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Linux PPC devel <linuxppc-dev@...abs.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Ryan S. Arnold" <rsa@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 4/5] hvc_console: Add tty window resizing

> +	hp = container_of(work, struct hvc_struct, tty_resize);
> +	if (!hp || !hp->tty)
> +		return;

What locks hp->tty here, it can go NULL after the test on a hangup it
seems ?

> + * hvc_resize() - Update terminal window size information.
> + * @hp:		HVC console pointer
> + * @ws:		Terminal window size structure

See tty_do_resize() for all of this stuff in the latest git. If you can't
use tty_do_resize from your work queue then please let me know why as I'd
like everyone to be using one abstraction.

We also now have a "resize" operation for devices that want to react to a
resize from TIOCSWINSZ
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