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Message-Id: <20120518023257.912012223@decadent.org.uk>
Date: Fri, 18 May 2012 03:33:20 +0100
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
alan@...rguk.ukuu.org.uk,
Bjørn Mork <bjorn@...k.no>,
Markus Kolb <linux-201011@...er-net.de>,
Iker Salmón San Millán
<shaola@...ebian.org>, Jonathan Nieder <jrnieder@...il.com>,
Oliver Neukum <oliver@...kum.org>,
"David S. Miller" <davem@...emloft.net>
Subject: [ 26/53] cdc_ether: Ignore bogus union descriptor for RNDIS devices
3.2.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Bjørn Mork <bjorn@...k.no>
commit 6eddcb4c82883451aec3be1240f17793370fa62f upstream.
Some RNDIS devices include a bogus CDC Union descriptor pointing
to non-existing interfaces. The RNDIS code is already prepared
to handle devices without a CDC Union descriptor by hardwiring
the driver to use interfaces 0 and 1, which is correct for the
devices with the bogus descriptor as well. So we can reuse the
existing workaround.
Cc: Markus Kolb <linux-201011@...er-net.de>
Cc: Iker Salmón San Millán <shaola@...ebian.org>
Cc: Jonathan Nieder <jrnieder@...il.com>
Cc: Oliver Neukum <oliver@...kum.org>
Cc: 655387@...s.debian.org
Signed-off-by: Bjørn Mork <bjorn@...k.no>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
drivers/net/usb/cdc_ether.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
index 90a3002..00880ed 100644
--- a/drivers/net/usb/cdc_ether.c
+++ b/drivers/net/usb/cdc_ether.c
@@ -83,6 +83,7 @@ int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
struct cdc_state *info = (void *) &dev->data;
int status;
int rndis;
+ bool android_rndis_quirk = false;
struct usb_driver *driver = driver_of(intf);
struct usb_cdc_mdlm_desc *desc = NULL;
struct usb_cdc_mdlm_detail_desc *detail = NULL;
@@ -195,6 +196,11 @@ int usbnet_generic_cdc_bind(struct usbnet *dev, struct usb_interface *intf)
info->control,
info->u->bSlaveInterface0,
info->data);
+ /* fall back to hard-wiring for RNDIS */
+ if (rndis) {
+ android_rndis_quirk = true;
+ goto next_desc;
+ }
goto bad_desc;
}
if (info->control != intf) {
@@ -271,11 +277,15 @@ next_desc:
/* Microsoft ActiveSync based and some regular RNDIS devices lack the
* CDC descriptors, so we'll hard-wire the interfaces and not check
* for descriptors.
+ *
+ * Some Android RNDIS devices have a CDC Union descriptor pointing
+ * to non-existing interfaces. Ignore that and attempt the same
+ * hard-wired 0 and 1 interfaces.
*/
- if (rndis && !info->u) {
+ if (rndis && (!info->u || android_rndis_quirk)) {
info->control = usb_ifnum_to_if(dev->udev, 0);
info->data = usb_ifnum_to_if(dev->udev, 1);
- if (!info->control || !info->data) {
+ if (!info->control || !info->data || info->control != intf) {
dev_dbg(&intf->dev,
"rndis: master #0/%p slave #1/%p\n",
info->control,
--
1.7.10
--
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