[PATCH 4/5] USB : serial : invoke dcd_change ldisc's handler.

[Paul Chavent]

In order to have the PPS line discipline to work with usb devices.

Signed-off-by: Paul Chavent <paul.chavent@xxxxxxxx>
---
 drivers/usb/serial/generic.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c
index 91f0592..a18a086 100644
--- a/drivers/usb/serial/generic.c
+++ b/drivers/usb/serial/generic.c
@@ -567,6 +567,13 @@ void usb_serial_handle_dcd_change(struct usb_serial_port *usb_port,
 {
 	struct tty_port *port = &usb_port->port;
 	struct tty_struct *tty = tty_port_tty_get(port);
+	struct tty_ldisc *ld = tty ? tty_ldisc_ref(tty) : NULL;
+
+	if (ld) {
+		if (ld->ops->dcd_change)
+			ld->ops->dcd_change(tty, status);
+		tty_ldisc_deref(ld);
+	}
 
 	dev_dbg(&usb_port->dev, "%s - status %d\n", __func__, status);
 
-- 
1.7.12.1

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