On Mon, Aug 28, 2017 at 04:32:53PM +0200, Maciej S. Szmigiero wrote: > Hi Johan, > > On 28.08.2017 12:19, Johan Hovold wrote: > > On Mon, Aug 21, 2017 at 05:43:46PM +0200, Maciej S. Szmigiero wrote: > >> This commit adds support (IDs, really) for D-Link DWM-157 hardware version > >> C1 USB modem to option driver. > >> > >> According to manufacturer-provided Windows INF file the device has four > >> serial ports: > >> "D-Link HSPA+DataCard Diagnostics Interface" (interface 2; modem port), > >> "D-Link HSPA+DataCard NMEA Device" (interface 3), > >> "D-Link HSPA+DataCard Speech Port" (interface 4), > >> "D-Link HSPA+DataCard Debug Port" (interface 5). > >> > >> Signed-off-by: Maciej S. Szmigiero <mail@xxxxxxxxxxxxxxxxxxxxx> > >> Cc: stable@xxxxxxxxxxxxxxx > >> --- > >> drivers/usb/serial/option.c | 2 ++ > >> 1 file changed, 2 insertions(+) > >> > >> diff --git a/drivers/usb/serial/option.c b/drivers/usb/serial/option.c > >> index fe123153b1a5..fa887c6e50e7 100644 > >> --- a/drivers/usb/serial/option.c > >> +++ b/drivers/usb/serial/option.c > >> @@ -2023,6 +2023,8 @@ static const struct usb_device_id option_ids[] = { > >> { USB_DEVICE_AND_INTERFACE_INFO(0x2001, 0x7d03, 0xff, 0x02, 0x01) }, > >> { USB_DEVICE_AND_INTERFACE_INFO(0x2001, 0x7d03, 0xff, 0x00, 0x00) }, > >> { USB_DEVICE_INTERFACE_CLASS(0x2001, 0x7d04, 0xff) }, /* D-Link DWM-158 */ > >> + { USB_DEVICE_AND_INTERFACE_INFO(0x2001, 0x7d0e, 0xff, 0x02, 0x01) }, /* D-Link DWM-157 C1 */ > >> + { USB_DEVICE_AND_INTERFACE_INFO(0x2001, 0x7d0e, 0xff, 0x00, 0x00) }, > > > > What is the reason for not using a single USB_DEVICE_INTERFACE_CLASS > > here instead? > > This is done to be as specific as possible (in case D-Link makes a > similar device with a different interface list or changes it > with a firmware update). We can always add more specific matching if this ever becomes an issue. > Also, three other D-Link modems few lines above are using the same > USB_DEVICE_AND_INTERFACE_INFO() selectors. Yeah, I noticed those, and I'm not sure why they're not using class-matching only either (and note that we have some entries that do). > > Do you have access to this device so that you could post the output of > > usb-devices (or "lsusb -v")? > > I've attached lsusb output to this message, since it is pretty long. Ok, thanks. So using USB_DEVICE_INTERFACE_CLASS() looks like it would work for this device, so please use that instead. If possible, try to include the more compact output of usb-devices in the commit message so we have it easily accessible. Thanks, Johan