linux-kernel - [PATCH 07/13] serial: bfin_sport_uart: protect changes to uart

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Message-Id: <1268155540-8241-8-git-send-email-vapier@gentoo.org>
Date:	Tue,  9 Mar 2010 12:25:34 -0500
From:	Mike Frysinger <vapier@...too.org>
To:	linux-serial@...r.kernel.org, Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Sonic Zhang <sonic.zhang@...log.com>
Subject: [PATCH 07/13] 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>
---
 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 a720e63..ba5a8b7 100644
--- a/drivers/serial/bfin_sport_uart.c
+++ b/drivers/serial/bfin_sport_uart.c
@@ -497,6 +497,8 @@ 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);
@@ -537,8 +539,6 @@ 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);
-- 
1.7.0.2

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