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-rw-r--r--drivers/tty/serial/pxa.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/tty/serial/pxa.c b/drivers/tty/serial/pxa.c
index 21b7d8b86493..7788d53281a0 100644
--- a/drivers/tty/serial/pxa.c
+++ b/drivers/tty/serial/pxa.c
@@ -223,6 +223,7 @@ static void serial_pxa_start_tx(struct uart_port *port)
}
}
+/* should hold up->port.lock */
static inline void check_modem_status(struct uart_pxa_port *up)
{
int status;
@@ -255,12 +256,14 @@ static inline irqreturn_t serial_pxa_irq(int irq, void *dev_id)
iir = serial_in(up, UART_IIR);
if (iir & UART_IIR_NO_INT)
return IRQ_NONE;
+ spin_lock(&up->port.lock);
lsr = serial_in(up, UART_LSR);
if (lsr & UART_LSR_DR)
receive_chars(up, &lsr);
check_modem_status(up);
if (lsr & UART_LSR_THRE)
transmit_chars(up);
+ spin_unlock(&up->port.lock);
return IRQ_HANDLED;
}