linux-kernel - Re: [PATCH 3/3] usb console,usb-serial: pass initial console baud on to first tty open

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Message-ID: <20090917101441.478b3e9b@lxorguk.ukuu.org.uk>
Date:	Thu, 17 Sep 2009 10:14:41 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Jason Wessel <jason.wessel@...driver.com>
Cc:	Alan Stern <stern@...land.harvard.edu>, gregkh@...e.de,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] usb console,usb-serial: pass initial console baud
 on to first tty open

> It looked like the API for the tty subsystem was gradually changing such
> that the ldisc structure could ultimately get shared for use with the
> console, but this work is not complete, so we are somewhere in between.

The mechanics of this are already there. A tty drive can manage its own
termios structs, and the termios structs are pointers in the tty structure

> The question is what is an acceptable solution?

Take a look at usb_serial.c:serial_install. You can do the console state
preservation there and cleanly.

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