cdc_ncm: toggle altsetting to force reset before setup

[ Upstream commit 48906f62c96cc2cd35753e59310cb70eb08cc6a5 ]

Some devices will silently fail setup unless they are reset first.
This is necessary even if the data interface is already in
altsetting 0, which it will be when the device is probed for the
first time.  Briefly toggling the altsetting forces a function
reset regardless of the initial state.

This fixes a setup problem observed on a number of Huawei devices,
appearing to operate in NTB-32 mode even if we explicitly set them
to NTB-16 mode.

Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 75d7d9dbbe35a5353e247bc5041f5cbbb4c95237..c6637229bdb82a254988c7af90fdecbd74329d65 100644 (file)
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -423,7 +423,11 @@ advance:
 
        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");