[PATCH 4.4 061/113] serial: imx: restore handshaking irq for imx1

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Uwe Kleine-KÃnig <u.kleine-koenig@xxxxxxxxxxxxxx>

commit 7e620984b62532783912312e334f3c48cdacbd5d upstream.

Back in 2015 when irda was dropped from the driver imx1 was broken. This
change reintroduces the support for the third interrupt of the UART.

Fixes: afe9cbb1a6ad ("serial: imx: drop support for IRDA")
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Uwe Kleine-KÃnig <u.kleine-koenig@xxxxxxxxxxxxxx>
Reviewed-by: Leonard Crestez <leonard.crestez@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/tty/serial/imx.c |    8 ++++++++
 1 file changed, 8 insertions(+)

--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1997,6 +1997,14 @@ static int serial_imx_probe(struct platf
 				       dev_name(&pdev->dev), sport);
 		if (ret)
 			return ret;
+
+		ret = devm_request_irq(&pdev->dev, rtsirq, imx_rtsint, 0,
+				       dev_name(&pdev->dev), sport);
+		if (ret) {
+			dev_err(&pdev->dev, "failed to request rts irq: %d\n",
+				ret);
+			return ret;
+		}
 	} else {
 		ret = devm_request_irq(&pdev->dev, rxirq, imx_int, 0,
 				       dev_name(&pdev->dev), sport);