linux-kernel - Re: [PATCH 2/2] pch_uart: Delete modem status interrupt enable code

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Date:	Wed, 2 Nov 2011 11:00:55 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Tomoya MORINAGA <tomoya-linux@....lapis-semi.com>
Cc:	Alan Cox <alan@...ux.intel.com>, gregkh@...e.de,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
	qi.wang@...el.com, yong.y.wang@...el.com, joel.clark@...el.com,
	kok.howg.ewe@...el.com
Subject: Re: [PATCH 2/2] pch_uart: Delete modem status interrupt enable code

> Called ".get_mctrl" function, other software can know incoming carrier 
> detection.
> Or you mean a uart driver must detect incoming carrier with interrupt ?

If a user opens a tty port which has no carrier signal then the open is
supposed to block until the carrier is raised unless either clocal
termios or O_NDELAY open flags are set.

That usually means you need to take the carrier raise interrupt in order
to wake out of open in this case.

Alan
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