From: Johan Hovold <jhovold@gmail.com>
Date: Sun, 22 Nov 2009 20:25:20 +0000 (+0100)
Subject: USB: ftdi_sio: fix initialisation of latency timeout
X-Git-Tag: accepted/tizen/common/20141203.182822~12665^2~205
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8c4f99cd54469d643e27a743045da848f7b63fe5;p=platform%2Fkernel%2Flinux-arm64.git

USB: ftdi_sio: fix initialisation of latency timeout

Latency timeout was read but never stored on port probe. When
ASYNC_LOW_LATENCY was cleared the device timeout would get set to 0
rather than the default 16ms.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index ffc79ee..9979d49 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1184,7 +1184,6 @@ static int read_latency_timer(struct usb_serial_port *port)
 	unsigned short latency = 0;
 	int rv = 0;
 
-
 	dbg("%s", __func__);
 
 	rv = usb_control_msg(udev,
@@ -1197,8 +1196,9 @@ static int read_latency_timer(struct usb_serial_port *port)
 	if (rv < 0) {
 		dev_err(&port->dev, "Unable to read latency timer: %i\n", rv);
 		return -EIO;
-	}
-	return latency;
+	} else
+		priv->latency = latency;
+	return rv;
 }
 
 static int get_serial_info(struct usb_serial_port *port,
@@ -1584,7 +1584,8 @@ static int ftdi_sio_port_probe(struct usb_serial_port *port)
 
 	ftdi_determine_type(port);
 	ftdi_set_max_packet_size(port);
-	read_latency_timer(port);
+	if (read_latency_timer(port) < 0)
+		priv->latency = 16;
 	create_sysfs_attrs(port);
 	return 0;
 }