tty: serial: imx: console write routing is unsafe on SMP

The console feature's write routing is unsafe on SMP with
the startup/shutdown call.

There could be several consumers of the console
* the kernel printk
* the init process using /dev/kmsg to call printk to show log
* shell, which open /dev/console and write with sys_write()

The shell goes into the normal uart open/write routing,
but the other two go into the console operations.
The open routing calls imx serial startup, which will write USR1/2
register without any lock and critical with imx_console_write call.

Add a spin_lock for startup/shutdown/console_write routing.

This patch is a port from Freescale's Android kernel.

Signed-off-by: Xinyu Chen <xinyu.chen@freescale.com>
Tested-by: Dirk Behme <dirk.behme@de.bosch.com>
CC: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index d5c689d6217e3a2eb46223fa1ffd01b77e15e0df..908178fc5a33c00b6d8a04634815f3f9fe2ed802 100644 (file)
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -754,6 +754,7 @@ static int imx_startup(struct uart_port *port)
                }
        }
 
+       spin_lock_irqsave(&sport->port.lock, flags);
        /*
         * Finally, clear and enable interrupts
         */
@@ -807,7 +808,6 @@ static int imx_startup(struct uart_port *port)
        /*
         * Enable modem status interrupts
         */
-       spin_lock_irqsave(&sport->port.lock,flags);
        imx_enable_ms(&sport->port);
        spin_unlock_irqrestore(&sport->port.lock,flags);
 
@@ -837,10 +837,13 @@ static void imx_shutdown(struct uart_port *port)
 {
        struct imx_port *sport = (struct imx_port *)port;
        unsigned long temp;
+       unsigned long flags;
 
+       spin_lock_irqsave(&sport->port.lock, flags);
        temp = readl(sport->port.membase + UCR2);
        temp &= ~(UCR2_TXEN);
        writel(temp, sport->port.membase + UCR2);
+       spin_unlock_irqrestore(&sport->port.lock, flags);
 
        if (USE_IRDA(sport)) {
                struct imxuart_platform_data *pdata;
@@ -869,12 +872,14 @@ static void imx_shutdown(struct uart_port *port)
         * Disable all interrupts, port and break condition.
         */
 
+       spin_lock_irqsave(&sport->port.lock, flags);
        temp = readl(sport->port.membase + UCR1);
        temp &= ~(UCR1_TXMPTYEN | UCR1_RRDYEN | UCR1_RTSDEN | UCR1_UARTEN);
        if (USE_IRDA(sport))
                temp &= ~(UCR1_IREN);
 
        writel(temp, sport->port.membase + UCR1);
+       spin_unlock_irqrestore(&sport->port.lock, flags);
 }
 
 static void
@@ -1217,6 +1222,9 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
        struct imx_port *sport = imx_ports[co->index];
        struct imx_port_ucrs old_ucr;
        unsigned int ucr1;
+       unsigned long flags;
+
+       spin_lock_irqsave(&sport->port.lock, flags);
 
        /*
         *      First, save UCR1/2/3 and then disable interrupts
@@ -1242,6 +1250,8 @@ imx_console_write(struct console *co, const char *s, unsigned int count)
        while (!(readl(sport->port.membase + USR2) & USR2_TXDC));
 
        imx_port_ucrs_restore(&sport->port, &old_ucr);
+
+       spin_unlock_irqrestore(&sport->port.lock, flags);
 }
 
 /*