linux-kernel - Re: [PATCH] synclink_gt use dynamic tty device registration

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Message-Id: <1178204455.3516.8.camel@amdx2.microgate.com>
Date:	Thu, 03 May 2007 10:00:55 -0500
From:	Paul Fulghum <paulkf@...rogate.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] synclink_gt use dynamic tty device registration

On Thu, 2007-05-03 at 00:05 -0700, Andrew Morton wrote:
> On Wed, 02 May 2007 11:17:33 -0500 Paul Fulghum <paulkf@...rogate.com> wrote:
> 
> > Change synclink_gt driver to use dynamic tty device registration.
> > 
> > ...
> >
> > +	for (i=0; i < port_count; ++i)
> > +		tty_register_device(serial_driver, port_array[i]->line, &(port_array[i]->pdev->dev));
> > ...
> > +		for (info=slgt_device_list ; info != NULL ; info=info->next_device)
> > +			tty_unregister_device(serial_driver, info->line);
> > ...
> > +	if ((rc = pci_register_driver(&pci_driver)) < 0) {
> 
> hm, not a big fan of kernel coding style, I see.

It varies. If this idiom bothers you, I can split it into 2 lines.

> What's going to happen here if tty_register_device() fails?

Then the device will not be accessible as a tty device.
It may still be accessible as a network device.
On driver unload, tty_unregister_device() does nothing because
the device was never created.

In this case, tracking the return value does not change anything.
I could add a printk on error to better inform the user that the
kernel's plumbing went south.

-- 
Paul Fulghum
Microgate Systems, Ltd

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