linux-kernel - Re: locking changes in tty broke low latency feature

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Message-ID: <20140219233511.2467cdc8@alan.etchedpixels.co.uk>
Date:	Wed, 19 Feb 2014 23:35:11 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Hal Murray <murray+fedora@...64-139-1-69.sjc.megapath.net>
Cc:	Peter Hurley <peter@...leysoftware.com>,
	Stanislaw Gruszka <sgruszka@...hat.com>,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	linux-rt-users@...r.kernel.org
Subject: Re: locking changes in tty broke low latency feature

> gpsd uses TIOCMIWAIT to get a wakeup from a PPS signal connected to a modem 
> control line.  That path might have the same problem and/or some ideas on how 
> to handle the data case.

TIOCMIWAIT should be fine. The data processing is deferred but very few
devices defer processing of modem change events.

Alan
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