diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index c129a0e8e807..c0c472ac5311 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -1310,7 +1310,8 @@ static unsigned int check_modem_status(struct uart_8250_port *up)
 {
 	unsigned int status = serial_in(up, UART_MSR);
 
-	if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI) {
+	if (status & UART_MSR_ANY_DELTA && up->ier & UART_IER_MSI &&
+	    up->port.info != NULL) {
 		if (status & UART_MSR_TERI)
 			up->port.icount.rng++;
 		if (status & UART_MSR_DDSR)