USB: Ignore storage device in modem mode on DWN-652

D-Link DWN-652 in Modem mode exposes 3 interfaces
- First one is the USB storage one
- Second one is for both control and connection
- Third one is unknown

This patch avoids usb-storage trying to switch again when already in
modem mode, and exposes only 2 ttyUSB instead of 3 by not attaching
to the storage interface

Signed-off-by: Pascal Terjan <pterjan@mandriva.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/usb/storage/option_ms.c b/drivers/usb/storage/option_ms.c
index 353f922939a4..126ea3424c03 100644
--- a/drivers/usb/storage/option_ms.c
+++ b/drivers/usb/storage/option_ms.c
@@ -94,7 +94,8 @@ int option_ms_init(struct us_data *us)
          */
         if (udev->descriptor.bDeviceClass != 0 ||
             udev->descriptor.bDeviceSubClass != 0 ||
-            udev->descriptor.bDeviceProtocol != 0)
+            udev->descriptor.bDeviceProtocol != 0 ||
+            udev->actconfig->desc.bNumInterfaces == 3)
                 return USB_STOR_TRANSPORT_GOOD;
 
         US_DEBUGP("Option MS: option_ms_init called\n");