cdc_ncm: toggle altsetting to force reset before setup

[cascardo/linux.git] / drivers / net / usb / cdc_ncm.c

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index dc0212c..be92796 100644 (file)
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -837,7 +837,11 @@ int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_
 
        iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
 
-       /* reset data interface */
+       /* Reset data interface. Some devices will not reset properly
+        * unless they are configured first.  Toggle the altsetting to
+        * force a reset
+        */
+       usb_set_interface(dev->udev, iface_no, data_altsetting);
        temp = usb_set_interface(dev->udev, iface_no, 0);
        if (temp) {
                dev_dbg(&intf->dev, "set interface failed\n");