serial: bfin-uart: Enable hardware automatic CTS only when CTS pin is available.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 10 insertions, 9 deletions

diff --git a/drivers/tty/serial/bfin_uart.c b/drivers/tty/serial/bfin_uart.c
index abac23741057..dedd9ab06d82 100644
--- a/drivers/tty/serial/bfin_uart.c
+++ b/drivers/tty/serial/bfin_uart.c
@@ -726,16 +726,17 @@ static int bfin_serial_startup(struct uart_port *port)
         }
 #endif
 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
-        if (uart->cts_pin >= 0 && request_irq(uart->status_irq,
-                bfin_serial_mctrl_cts_int,
-                0, "BFIN_UART_MODEM_STATUS", uart)) {
-                uart->cts_pin = -1;
-                pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n");
-        }
+        if (uart->cts_pin >= 0) {
+                if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
+                        IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
+                        uart->cts_pin = -1;
+                        dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
+                }
 
-        /* CTS RTS PINs are negative assertive. */
-        UART_PUT_MCR(uart, ACTS);
-        UART_SET_IER(uart, EDSSI);
+                /* CTS RTS PINs are negative assertive. */
+                UART_PUT_MCR(uart, ACTS);
+                UART_SET_IER(uart, EDSSI);
+        }
 #endif
 
         UART_SET_IER(uart, ERBFI);