> But we already have many Sierra devices with 2 QMI interfaces (the 3rd one
> is documented and verified non-functional for unknown reasons). And these
> tend to come with multiple OEM device IDs.  So a whitelist method could
> reduce the number of matching entries considerably.  Feel free to submit
> patches if you like :-)

Dear Bjorg,
I'm going to prepare the following patch. 
If you think it is ok, I will build and test it and if working I will submit it.
Bye.

diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
index 5894e3c..c708a8f 100644
--- a/drivers/net/usb/qmi_wwan.c
+++ b/drivers/net/usb/qmi_wwan.c
@@ -1100,6 +1100,9 @@ static const struct usb_device_id products[] = {
        {QMI_FIXED_INTF(0x0846, 0x68a2, 8)},
        {QMI_FIXED_INTF(0x12d1, 0x140c, 1)},    /* Huawei E173 */
        {QMI_FIXED_INTF(0x12d1, 0x14ac, 1)},    /* Huawei E1820 */
+        {QMI_FIXED_INTF(0x1435, 0xd181, 3)},    /* D18, WNC VID, d181-3 */
+        {QMI_FIXED_INTF(0x1435, 0xd181, 4)},    /* D18, WNC VID, d181-4 */
+        {QMI_FIXED_INTF(0x1435, 0xd181, 5)},    /* D18, WNC VID, d181-5 */
        {QMI_FIXED_INTF(0x16d8, 0x6003, 0)},    /* CMOTech 6003 */
        {QMI_FIXED_INTF(0x16d8, 0x6007, 0)},    /* CMOTech CHE-628S */
        {QMI_FIXED_INTF(0x16d8, 0x6008, 0)},    /* CMOTech CMU-301 */
diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c
index ebe51f11..6944e87 100644
--- a/drivers/usb/serial/option.c
+++ b/drivers/usb/serial/option.c
@@ -2035,6 +2035,8 @@ static const struct usb_device_id option_ids[] = {
        { USB_DEVICE_AND_INTERFACE_INFO(WETELECOM_VENDOR_ID, 
WETELECOM_PRODUCT_6802, 0xff, 0xff, 0xff) },
        { USB_DEVICE_AND_INTERFACE_INFO(WETELECOM_VENDOR_ID, 
WETELECOM_PRODUCT_WMD300, 0xff, 0xff, 0xff) },
        { USB_DEVICE_AND_INTERFACE_INFO(0x03f0, 0x421d, 0xff, 0xff, 0xff) }, /* 
HP lt2523 (Novatel E371) */
+       {USB_DEVICE_INTERFACE_NUMBER(0x1435, 0xd181, 0)},    /* D18, WNC VID, 
d181-0 */
+       {USB_DEVICE_INTERFACE_NUMBER(0x1435, 0xd181, 2)},    /* D18, WNC VID, 
d181-2 */
        { } /* Terminating entry */
 };
 MODULE_DEVICE_TABLE(usb, option_ids);

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