linux-kernel - [PATCH 1/2] serial: core: Don't drop DTR if system console

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Date:	Wed,  4 Jun 2014 10:16:10 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Valerio Vanni <valerio.vanni@...ind.it>,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH 1/2] serial: core: Don't drop DTR if system console

If a tty is opened on a serial console, don't drop DTR on
last tty close, on tty hangup, or when resetting port hardware
via TIOCSSERIAL and TIOCSERCONFIG ioctls.

Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/serial/serial_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index b68550d..498b149 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -239,7 +239,8 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
 		/*
 		 * Turn off DTR and RTS early.
 		 */
-		if (!tty || (tty->termios.c_cflag & HUPCL))
+		if (!uart_console(uport) &&
+		    (!tty || (tty->termios.c_cflag & HUPCL)))
 			uart_clear_mctrl(uport, TIOCM_DTR | TIOCM_RTS);
 
 		uart_port_shutdown(port);
-- 
1.9.1

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