linux-kernel - Re: [PATCH 07/16] TTY: quatech2, remove unneeded is

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Date:	Wed, 13 Mar 2013 09:46:01 -0400
From:	wfp5p@...idian.itc.virginia.edu (Bill Pemberton)
To:	jslaby@...e.cz (Jiri Slaby)
Cc:	gregkh@...uxfoundation.org, peter@...leysoftware.com,
	jirislaby@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/16] TTY: quatech2, remove unneeded is_open

Jiri Slaby writes:
> 
> tty->ops->break_ctl cannot be called outside the gap between open and
> close. So there is no need to check whether the port is open in
> break_ctl in quatech2. Remove the check and also that member
> completely.
> 

We can't get rid of is_open.  The devices use 1 read urb for all ports
and will send various things about ports that haven't actually been
opened.  So the driver needs to know if a port has actually been
opened or not.  In fact, I was about to send a patch that fixes a
warning caused by commit 2e124b4a390ca85325fae75764bef92f0547fa25
causing the driver to try to write to ttys that weren't actually
opened.

The guard in qt2_break_ctl() can still be removed.

-- 
Bill
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