linux-kernel - [PATCH 07/25] serial: bfin_sport_uart: protect changes to uart

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Date:	Fri, 21 May 2010 09:51:36 -0700
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Sonic Zhang <sonic.zhang@...log.com>,
	Mike Frysinger <vapier@...too.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 07/25] serial: bfin_sport_uart: protect changes to uart_port

From: Sonic Zhang <sonic.zhang@...log.com>

Common serial API says we need to grab the port lock before modifying
the port state to prevent inconsistent state between threads.

Signed-off-by: Sonic Zhang <sonic.zhang@...log.com>
Signed-off-by: Mike Frysinger <vapier@...too.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/serial/bfin_sport_uart.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/serial/bfin_sport_uart.c b/drivers/serial/bfin_sport_uart.c
index 8cb0a40..5224db2 100644
--- a/drivers/serial/bfin_sport_uart.c
+++ b/drivers/serial/bfin_sport_uart.c
@@ -498,6 +498,8 @@ static void sport_set_termios(struct uart_port *port,
 		/* up->parib = 1; */
 	}
 
+	spin_lock_irqsave(&up->port.lock, flags);
+
 	port->read_status_mask = OE;
 	if (termios->c_iflag & INPCK)
 		port->read_status_mask |= (FE | PE);
@@ -538,8 +540,6 @@ static void sport_set_termios(struct uart_port *port,
 	/* uart baud rate */
 	port->uartclk = uart_get_baud_rate(port, termios, old, 0, get_sclk()/16);
 
-	spin_lock_irqsave(&up->port.lock, flags);
-
 	/* Disable UART */
 	SPORT_PUT_TCR1(up, SPORT_GET_TCR1(up) & ~TSPEN);
 	SPORT_PUT_RCR1(up, SPORT_GET_RCR1(up) & ~RSPEN);
-- 
1.7.0.3

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