From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Tomoya MORINAGA <tomoya-linux@dsn.lapis-semi.com>
Cc: Alan Cox <alan@linux.intel.com>,
gregkh@suse.de, linux-kernel@vger.kernel.org,
linux-serial@vger.kernel.org, qi.wang@intel.com,
yong.y.wang@intel.com, joel.clark@intel.com,
kok.howg.ewe@intel.com
Subject: Re: [PATCH 2/2] pch_uart: Delete modem status interrupt enable code
Date: Wed, 2 Nov 2011 11:00:55 +0000 [thread overview]
Message-ID: <20111102110055.153d06c6@lxorguk.ukuu.org.uk> (raw)
In-Reply-To: <4EB0DAB6.7000106@dsn.lapis-semi.com>
> 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
next prev parent reply other threads:[~2011-11-02 11:01 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-27 6:45 [PATCH 1/2] pch_uart: Fix hw-flow control issue Tomoya MORINAGA
2011-10-27 6:45 ` [PATCH 2/2] pch_uart: Delete modem status interrupt enable code Tomoya MORINAGA
2011-11-01 12:57 ` Alan Cox
2011-11-02 5:52 ` Tomoya MORINAGA
2011-11-02 11:00 ` Alan Cox [this message]
2011-11-10 2:11 ` Tomoya MORINAGA
2011-11-01 12:55 ` [PATCH 1/2] pch_uart: Fix hw-flow control issue Alan Cox
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