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

[Peter Hurley]

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@xxxxxxxxxxxxxxxxxx>
---
 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/