linux-kernel - [PATCH 1/2] tty_port: If we are opened non blocking we still need to raise the carrier

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Message-Id: <1258506090-16802-1-git-send-email-gregkh@suse.de>
Date:	Tue, 17 Nov 2009 17:01:29 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Alan Cox <alan@...ux.intel.com>, stable <stable@...nel.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 1/2] tty_port: If we are opened non blocking we still need to raise the carrier

From: Alan Cox <alan@...ux.intel.com>

Original discussion:
http://thread.gmane.org/gmane.linux.usb.general/23217/focus=23248
or
http://marc.info/?l=linux-usb&m=125553790714133&w=2

The tty_port code inherited a bug common to various drivers it was based
upon. If the tty is opened O_NONBLOCK we do not wait for the carrier to be
raised but we must still raise our modem lines if appropriate.

(There is a second question here about whether we should do so if CLOCAL is
 set but that can wait)

Signed-off-by: Alan Cox <alan@...ux.intel.com>
Reported-by: Karl Hiramoto <karl@...amoto.org>
Tested-by:  Karl Hiramoto <karl@...amoto.org>
Cc: stable <stable@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/char/tty_port.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/char/tty_port.c b/drivers/char/tty_port.c
index a4bbb28..2e8552d 100644
--- a/drivers/char/tty_port.c
+++ b/drivers/char/tty_port.c
@@ -221,6 +221,9 @@ int tty_port_block_til_ready(struct tty_port *port,
 	   the port has just hung up or is in another error state */
 	if ((filp->f_flags & O_NONBLOCK) ||
 			(tty->flags & (1 << TTY_IO_ERROR))) {
+		/* Indicate we are open */
+		if (tty->termios->c_cflag & CBAUD)
+			tty_port_raise_dtr_rts(port);
 		port->flags |= ASYNC_NORMAL_ACTIVE;
 		return 0;
 	}
-- 
1.6.4.2

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