--- drivers/serial/imx.c

+++ drivers/serial/imx.c

@@ -382,12 +382,13 @@ static void imx_start_tx(struct uart_por

static irqreturn_t imx_rtsint(int irq, void *dev_id)

{

struct imx_port *sport = dev_id;

- unsigned int val = readl(sport->port.membase + USR1) & USR1_RTSS;

+ unsigned int val;

unsigned long flags;

spin_lock_irqsave(&sport->port.lock, flags);

writel(USR1_RTSD, sport->port.membase + USR1);

+ val = readl(sport->port.membase + USR1) & USR1_RTSS;

uart_handle_cts_change(&sport->port, !!val);

wake_up_interruptible(&sport->port.state->port.delta_msr_wait);