linux-kernel - [PATCH 1/2] hso: Earlier catch of error condition

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Date:	Wed, 21 Aug 2013 01:43:07 -0700
From:	Daniel Gimpelevich <daniel@...pelevich.san-francisco.ca.us>
To:	gregkh@...uxfoundation.org, j.dumon@...ion.com,
	linux-usb@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] hso: Earlier catch of error condition

There is no need to get an interface specification if we know it's the
wrong one. 

Signed-off-by: Daniel Gimpelevich <daniel@...pelevich.san-francisco.ca.us>
---
 drivers/net/usb/hso.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c
index cba1d46..5fb36ed 100644
--- a/drivers/net/usb/hso.c
+++ b/drivers/net/usb/hso.c
@@ -2886,6 +2886,11 @@ static int hso_probe(struct usb_interface *interface,
 	struct hso_shared_int *shared_int;
 	struct hso_device *tmp_dev = NULL;
 
+	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
+		dev_err(&interface->dev, "Not our interface\n");
+		return -ENODEV;
+	}
+
 	if_num = interface->altsetting->desc.bInterfaceNumber;
 
 	/* Get the interface/port specification from either driver_info or from
@@ -2895,10 +2900,6 @@ static int hso_probe(struct usb_interface *interface,
 	else
 		port_spec = hso_get_config_data(interface);
 
-	if (interface->cur_altsetting->desc.bInterfaceClass != 0xFF) {
-		dev_err(&interface->dev, "Not our interface\n");
-		return -ENODEV;
-	}
 	/* Check if we need to switch to alt interfaces prior to port
 	 * configuration */
 	if (interface->num_altsetting > 1)
-- 
1.7.9.5

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