linux-kernel - [PATCH 2/3] serial: core, do not set DTR/RTS twice on startup

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Date:	Wed, 30 Mar 2011 00:10:56 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	gregkh@...e.de
Cc:	linux-kernel@...r.kernel.org, jirislaby@...il.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 2/3] serial: core, do not set DTR/RTS twice on startup

In .dtr_rts we do:
  uart_set_mctrl(uport, TIOCM_DTR | TIOCM_RTS)
and call uart_update_termios. It does:
  uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS)
once again. As the only callsite of uart_update_termios is .dtr_rts,
remove the uart_set_mctrl from uart_update_termios to not set it twice.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
Cc: Greg Kroah-Hartman <gregkh@...e.de>
Cc: Arnd Bergmann <arnd@...db.de>
---
 drivers/tty/serial/serial_core.c |   14 --------------
 1 files changed, 0 insertions(+), 14 deletions(-)

diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c
index 47657cf..3aae8ed 100644
--- a/drivers/tty/serial/serial_core.c
+++ b/drivers/tty/serial/serial_core.c
@@ -1483,20 +1483,6 @@ static void uart_hangup(struct tty_struct *tty)
 static void uart_update_termios(struct tty_struct *tty,
 						struct uart_state *state)
 {
-	struct uart_port *port = state->uart_port;
-
-	/*
-	 * If the device failed to grab its irq resources,
-	 * or some other error occurred, don't try to talk
-	 * to the port hardware.
-	 */
-	if (!(tty->flags & (1 << TTY_IO_ERROR))) {
-		/*
-		 * And finally enable the RTS and DTR signals.
-		 */
-		if (tty->termios->c_cflag & CBAUD)
-			uart_set_mctrl(port, TIOCM_DTR | TIOCM_RTS);
-	}
 }
 
 static int uart_carrier_raised(struct tty_port *port)
-- 
1.7.4.1


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