From: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
The reworked Ethernet gadget has an RNDIS interop problem when used
with the CDC subset driver ... e.g. on PXA 2xx and 3xx hardware,
which currently has a hard time talking to MS-Windows hosts.
The issue is that Microsoft requires USB_CLASS_COMM. Fix by tweaking
the CDC subset driver to not switch to USB_CLASS_VENDOR_SPEC if RNDIS
is used in some other device configuration.
Signed-off-by: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Cc: Aric Blumer <aric@xxxxxxxxxxxxxx>
---
This is appropriate for the stable trees, as far back as it applies.
drivers/usb/gadget/ether.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/usb/gadget/ether.c
+++ b/drivers/usb/gadget/ether.c
@@ -295,7 +295,8 @@ static int __init eth_bind(struct usb_co
device_desc.idVendor = cpu_to_le16(SIMPLE_VENDOR_NUM),
device_desc.idProduct = cpu_to_le16(SIMPLE_PRODUCT_NUM),
- device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC;
+ if (!has_rndis())
+ device_desc.bDeviceClass = USB_CLASS_VENDOR_SPEC;
}
if (has_rndis()) {
--
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