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-201...@tower-net.de
Cc: Iker Salmón San Millán sha...@esdebian.org
Cc: Jonathan Nieder jrnie...@gmail.com
Cc: Oliver Neukum oli...@neukum.org
Cc: 655...@bugs.debian.org
Cc: sta...@vger.kernel.org
Signed-off-by: Bjørn Mork bj...@mork.no
---
Something like this, then?
This has only been build tested by me as I don't have any of the affected
devices. It would be great if any of the reporters could verify that it
solves the problem. I can provide prebuilt modules for Debian 3.2 based
kernels to simplify the testing (just rmmod and insmod - no need to build
or boot). Send me an email if you want the module.
Sorry for the long delay in following up this. I totally forgot about it.
Bjørn
drivers/net/usb/cdc_ether.c | 12 +++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/net/usb/cdc_ether.c b/drivers/net/usb/cdc_ether.c
index 90a3002..4ed5a38 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;
+ boolandroid_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) {
@@ -271,8 +277,12 @@ 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) {
--
1.7.10
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