USB: Support for BT On-Air USB modem in cdc-acm.c

The patch below is a necessary workaround to support the BT On-Air USB modem, which
fails to initialise properly during normal probing thus:

Sep 30 17:34:57 sled kernel: drivers/usb/class/cdc-acm.c: Zero length descriptor references
Sep 30 17:34:57 sled kernel: cdc_acm: probe of 1-1.2:1.0 failed with error -22

Adding the patch below causes the probing section to be skipped, and the modem
then initialises correctly.

Signed-off-by: Chris Malley <mail@chrismalley.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index ec4d1d756725..daecdf0bff04 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1083,6 +1083,9 @@ static struct usb_device_id acm_ids[] = {
         { USB_DEVICE(0x0482, 0x0203), /* KYOCERA AH-K3001V */
         .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
         },
+        { USB_DEVICE(0x079b, 0x000f), /* BT On-Air USB MODEM */
+        .driver_info = NO_UNION_NORMAL, /* has no union descriptor */
+        },
         { USB_DEVICE(0x0ace, 0x1608), /* ZyDAS 56K USB MODEM */
         .driver_info = SINGLE_RX_URB, /* firmware bug */
         },