linux-kernel - [PATCH 2/4] serial: MPSC: Stop rx engine when CREAD cleared

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Message-ID: <20070719172902.GB589@mag.az.mvista.com>
Date:	Thu, 19 Jul 2007 10:29:02 -0700
From:	"Mark A. Greer" <mgreer@...sta.com>
To:	lkml <linux-kernel@...r.kernel.org>
Cc:	stephane@...esyncp.com, Andrew Morton <akpm@...l.org>
Subject: [PATCH 2/4] serial: MPSC: Stop rx engine when CREAD cleared

From: Stephane Chazelas <stephane@...esyncp.com>

Currently, the MPSC driver doesn't stop recieving characters when the
CREAD flag in termios->c_cflag is cleared.  It should.  Also, only start
receiving if its not already started.

Signed-off-by: Stephane Chazelas <stephane@...esyncp.com>
Signed-off-by: Mark A. Greer <mgreer@...sta.com>
---
 drivers/serial/mpsc.c |   13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/drivers/serial/mpsc.c b/drivers/serial/mpsc.c
index 99715fe..108fa4c 100644
--- a/drivers/serial/mpsc.c
+++ b/drivers/serial/mpsc.c
@@ -1536,7 +1536,6 @@ mpsc_set_termios(struct uart_port *port, struct ktermios *termios,
 	mpsc_set_baudrate(pi, baud);
 
 	/* Characters/events to read */
-	pi->rcv_data = 1;
 	pi->port.read_status_mask = SDMA_DESC_CMDSTAT_OR;
 
 	if (termios->c_iflag & INPCK)
@@ -1560,11 +1559,15 @@ mpsc_set_termios(struct uart_port *port, struct ktermios *termios,
 			pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_OR;
 	}
 
-	/* Ignore all chars if CREAD not set */
-	if (!(termios->c_cflag & CREAD))
+	if ((termios->c_cflag & CREAD)) {
+		if (!pi->rcv_data) {
+			pi->rcv_data = 1;
+			mpsc_start_rx(pi);
+		}
+	} else if (pi->rcv_data) {
+		mpsc_stop_rx(port);
 		pi->rcv_data = 0;
-	else
-		mpsc_start_rx(pi);
+	}
 
 	spin_unlock_irqrestore(&pi->port.lock, flags);
 	return;

-
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