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

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Date:	Thu, 17 Sep 2009 14:19:13 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Jason Wessel <jason.wessel@...driver.com>,
	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

On Thu, 17 Sep 2009 14:08:28 +0100
Alan Cox <alan@...rguk.ukuu.org.uk> wrote:

> 
> > -			memset(&dummy, 0, sizeof(struct ktermios));
> > -			tty->termios = termios;
> > +			tty->termios = &usb_serial_tty_driver->init_termios;
> 
> That will corrupt the master one which is a reference used for many ports.
> 
> 
> You need the serial_install stuff or something similar resurrecting to do
> this properly.

Here's a suggestion on how to do it.

Add a tty->ops->init_termios()

Make tty_init_termios() read

       if (tp == NULL) {
                tp = kzalloc(sizeof(struct ktermios[2]), GFP_KERNEL);
                if (tp == NULL)
                        return -ENOMEM;
                memcpy(tp, &tty->driver->init_termios,
                                                sizeof(struct ktermios));
		if (tty->ops->init_termios)
			tty->ops->init_termios(tty);
                tty->driver->termios[idx] = tp;
        }

Thats a good deal cleaner than the ->install override in the USB patches
Greg inherited and will be usable for cleaning up USB stuff too.

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