linux-kernel - Re: [PATCH 24/24] TTY: use tty_port_register

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Message-ID: <20120609172723.GB6244@kroah.com>
Date:	Sat, 9 Jun 2012 10:27:23 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Jiri Slaby <jslaby@...e.cz>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, alan@...ux.intel.com,
	linux-kernel@...r.kernel.org, jirislaby@...il.com
Subject: Re: [PATCH 24/24] TTY: use tty_port_register_device

On Sat, Jun 09, 2012 at 04:58:43PM +0200, Jiri Slaby wrote:
> On 06/04/2012 07:00 PM, Alan Cox wrote:
> >> In this patch we modify most of the drivers to do the latter. When the
> >> drivers use tty_register_device and we have tty_port already, we
> >> switch to tty_port_register_device. So we have the tty_struct =>
> >> tty_port link for free for those.
> > 
> > Nice solution
> 
> Seems so on the first glance... But it is racy. There is a window since
> tty_register_driver to tty_(port_)register_device where a node may be
> opened already, but tty_port won't be set up yet.
> 
> The fix is to move cdev_add from tty_register_driver to
> tty_register_device, which makes sense anyway. Any objections?
> 
> For the time being, Greg, please ignore 24/24 from these series (I see
> you haven't applied any of the patches yet.)

Ok, I'll drop 24/24.  I should get to these this upcoming week as I am
finally going to be home from all of my crazy traveling.

greg k-h
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