linux-kernel - [PATCH 2/2] usb: serial: xsens_mt: always bind to interface number 1

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Date:	Mon, 1 Sep 2014 10:32:13 +0200
From:	Frans Klaver <frans.klaver@...ns.com>
To:	<usb-serial@...r.kernel.org>
CC:	Frans Klaver <frans.klaver@...ns.com>,
	Johan Hovold <johan@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Frans Klaver <fransklaver@...il.com>, <stable@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] usb: serial: xsens_mt: always bind to interface number 1

Probe is testing if the current interface provides two bulk endpoints.
While this achieves the goal of only binding to the correct interface,
we already know we can find the device on interface number 1. Stop
checking the endpoints and just return successfully when interface
number 1 is probed.

Signed-off-by: Frans Klaver <frans.klaver@...ns.com>
---
 drivers/usb/serial/xsens_mt.c | 23 ++++-------------------
 1 file changed, 4 insertions(+), 19 deletions(-)

diff --git a/drivers/usb/serial/xsens_mt.c b/drivers/usb/serial/xsens_mt.c
index d500ccd..ea67ed9 100644
--- a/drivers/usb/serial/xsens_mt.c
+++ b/drivers/usb/serial/xsens_mt.c
@@ -41,28 +41,13 @@ static const struct usb_device_id id_table[] = {
 };
 MODULE_DEVICE_TABLE(usb, id_table);
 
-static int has_required_endpoints(const struct usb_host_interface *interface)
-{
-	__u8 i;
-	int has_bulk_in = 0;
-	int has_bulk_out = 0;
-
-	for (i = 0; i < interface->desc.bNumEndpoints; ++i) {
-		if (usb_endpoint_is_bulk_in(&interface->endpoint[i].desc))
-			has_bulk_in = 1;
-		else if (usb_endpoint_is_bulk_out(&interface->endpoint[i].desc))
-			has_bulk_out = 1;
-	}
-
-	return has_bulk_in && has_bulk_out;
-}
-
 static int xsens_mt_probe(struct usb_serial *serial,
 					const struct usb_device_id *id)
 {
-	if (!has_required_endpoints(serial->interface->cur_altsetting))
-		return -ENODEV;
-	return 0;
+	if (serial->interface->cur_altsetting.desc.bInterfaceNumber == 1)
+		return 0;
+
+	return -ENODEV;
 }
 
 static struct usb_serial_driver xsens_mt_device = {
-- 
2.1.0

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