netdev - [PATCH] net: cdc_ether: allow combined control and data interface

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Message-Id: <1372432629-17245-1-git-send-email-bjorn@mork.no>
Date:	Fri, 28 Jun 2013 17:17:08 +0200
From:	Bjørn Mork <bjorn@...k.no>
To:	netdev@...r.kernel.org
Cc:	linux-usb@...r.kernel.org, Enrico Mioso <mrkiko.rs@...il.com>,
	Oliver Neukum <oliver@...kum.org>,
	Bjørn Mork <bjorn@...k.no>
Subject: [PATCH] net: cdc_ether: allow combined control and data interface

Some Icera based Huawei modems handled by this driver are not
completely CDC ECM compliant, using the same USB interface for both
control and data. The CDC functional descriptors include a Union
naming this interface as both master and slave, so it is supportable
by relaxing the descriptor parsing in case these interfaces are
identical.

This has been tested on a Huawei K3806 and verified to add support
for that device.

Reported-and-tested-by: Enrico Mioso <mrkiko.rs@...il.com>
Signed-off-by: Bjørn Mork <bjorn@...k.no>
---
 drivers/net/usb/cdc_ether.c |   24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
index 04ee044..7d88fef 100644
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c
@@ -215,6 +215,10 @@ int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
 					goto bad_desc;
 			}
 
+			/* some devices merge these - skip class check */
+			if (info->control == info->data)
+				goto next_desc;
+
 			/* a data interface altsetting does the real i/o */
 			d = &info->data->cur_altsetting->desc;
 			if (d->bInterfaceClass != USB_CLASS_CDC_DATA) {
@@ -304,19 +308,23 @@ next_desc:
 	/* claim data interface and set it up ... with side effects.
 	 * network traffic can't flow until an altsetting is enabled.
 	 */
-	status = usb_driver_claim_interface(driver, info->data, dev);
-	if (status < 0)
-		return status;
+	if (info->data != info->control) {
+		status = usb_driver_claim_interface(driver, info->data, dev);
+		if (status < 0)
+			return status;
+	}
 	status = usbnet_get_endpoints(dev, info->data);
 	if (status < 0) {
 		/* ensure immediate exit from usbnet_disconnect */
 		usb_set_intfdata(info->data, NULL);
-		usb_driver_release_interface(driver, info->data);
+		if (info->data != info->control)
+			usb_driver_release_interface(driver, info->data);
 		return status;
 	}
 
 	/* status endpoint: optional for CDC Ethernet, not RNDIS (or ACM) */
-	dev->status = NULL;
+	if (info->data != info->control)
+		dev->status = NULL;
 	if (info->control->cur_altsetting->desc.bNumEndpoints == 1) {
 		struct usb_endpoint_descriptor	*desc;
 
@@ -353,7 +361,8 @@ void usbnet_cdc_unbind(struct usbnet *dev, struct usb_interface *intf)
 	if (intf == info->control && info->data) {
 		/* ensure immediate exit from usbnet_disconnect */
 		usb_set_intfdata(info->data, NULL);
-		usb_driver_release_interface(driver, info->data);
+		if (info->data != info->control)
+			usb_driver_release_interface(driver, info->data);
 		info->data = NULL;
 	}
 
@@ -361,7 +370,8 @@ void usbnet_cdc_unbind(struct usbnet *dev, struct usb_interface *intf)
 	else if (intf == info->data && info->control) {
 		/* ensure immediate exit from usbnet_disconnect */
 		usb_set_intfdata(info->control, NULL);
-		usb_driver_release_interface(driver, info->control);
+		if (info->data != info->control)
+			usb_driver_release_interface(driver, info->control);
 		info->control = NULL;
 	}
 }
-- 
1.7.10.4

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