linux-kernel - Re: [PATCH] USB: ftdi_sio: Remove tty->low

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Date:	Sun, 04 Oct 2009 16:39:22 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Johan Hovold <jhovold@...il.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Michael Trimarchi <trimarchi@...dalf.sssup.it>,
	Oliver Neukum <oliver@...kum.org>, linux-usb@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] USB: ftdi_sio: Remove tty->low_latency.

Johan Hovold <jhovold@...il.com> writes:

>> > > > +	 * The per character mucking around with sysrq path it too slow, so
>> > > > +	 * shortcircuit it in the 99.9999999% of cases where the USB serial is
>> > > > +	 * not a console anyway.
>> > > > +	 */
>> > > > +	ch = packet + 2;
>> > > > +	len -= 2;
>> > > > +	if (!port->console || !port->sysrq)
>> > > 
>> > > You need && flag == TTY_NORMAL ?
>> > 
>> > You tell me. :-) Are we interested in them unless port->console is set?
>> 
>> Yes - we don;t care about the sysrq but we care about error characters
>> being reported ot the line discipline properly.
>
> Wasn't thinking.. Here's an update which always passes error characters.
> It also uses ASYNCB_INITIALIZED (instead of ASYNCB_CLOSING) in unthrottle.

To test this what should I be applying this on top of?
There have been a lot of patches flying around.


Eric
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