From 0dd7a1aed7c34a39917c4faf75b4230c169e809b Mon Sep 17 00:00:00 2001
From: Russell King <rmk@dyn-67.arm.linux.org.uk>
Date: Wed, 29 Jun 2005 18:40:53 +0100
Subject: [PATCH] Serial: Check status of CTS when using flow control

Fix bugme #4712: read the CTS status and set hw_stopped if CTS
is not active when opening the port and/or enabling CRTSCTS

Thanks to Stefan Wolff for spotting this problem.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/drivers/serial/serial_core.c b/drivers/serial/serial_core.c
index f5ce58d..139863a 100644
--- a/drivers/serial/serial_core.c
+++ b/drivers/serial/serial_core.c
@@ -182,6 +182,13 @@ static int uart_startup(struct uart_state *state, int init_hw)
 				uart_set_mctrl(port, TIOCM_RTS | TIOCM_DTR);
 		}
 
+		if (info->flags & UIF_CTS_FLOW) {
+			spin_lock_irq(&port->lock);
+			if (!(port->ops->get_mctrl(port) & TIOCM_CTS))
+				info->tty->hw_stopped = 1;
+			spin_unlock_irq(&port->lock);
+		}
+
 		info->flags |= UIF_INITIALIZED;
 
 		clear_bit(TTY_IO_ERROR, &info->tty->flags);
@@ -1134,6 +1141,16 @@ static void uart_set_termios(struct tty_struct *tty, struct termios *old_termios
 		spin_unlock_irqrestore(&state->port->lock, flags);
 	}
 
+	/* Handle turning on CRTSCTS */
+	if (!(old_termios->c_cflag & CRTSCTS) && (cflag & CRTSCTS)) {
+		spin_lock_irqsave(&state->port->lock, flags);
+		if (!(state->port->ops->get_mctrl(state->port) & TIOCM_CTS)) {
+			tty->hw_stopped = 1;
+			state->port->ops->stop_tx(state->port, 0);
+		}
+		spin_unlock_irqrestore(&state->port->lock, flags);
+	}
+
 #if 0
 	/*
 	 * No need to wake up processes in open wait, since they
-- 
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