From: Paul Chavent <Paul.Chavent@onera.fr>
Date: Mon, 16 Sep 2013 06:40:59 +0000 (+0200)
Subject: USB: serial: call handle_dcd_change in ftdi driver.
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d14654dff7a3520b5220367b848732a0a8ccdabe;p=linux-beck.git

USB: serial: call handle_dcd_change in ftdi driver.

When the device receive a DCD status change, forward the signal to the
USB serial system. This way, we can detect, for instance, PPS pulses.

Signed-off-by: Paul Chavent <paul.chavent@onera.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index c45f9c0a1b34..f53298d32099 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1966,8 +1966,16 @@ static int ftdi_process_packet(struct usb_serial_port *port,
 			port->icount.dsr++;
 		if (diff_status & FTDI_RS0_RI)
 			port->icount.rng++;
-		if (diff_status & FTDI_RS0_RLSD)
+		if (diff_status & FTDI_RS0_RLSD) {
+			struct tty_struct *tty;
+
 			port->icount.dcd++;
+			tty = tty_port_tty_get(&port->port);
+			if (tty)
+				usb_serial_handle_dcd_change(port, tty,
+						status & FTDI_RS0_RLSD);
+			tty_kref_put(tty);
+		}
 
 		wake_up_interruptible(&port->port.delta_msr_wait);
 		priv->prev_status = status;