V4L/DVB (13925): gspca - main: Change the check of the USB video interface.

Some webcams have many interfaces with the same interface class, so the
previous interface check did not work.
The new code checks if the interface number is zero or the only one.

Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 3 insertions, 6 deletions

diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
index 351cf8a658fc..04aaa88ce4f5 100644
--- a/drivers/media/video/gspca/gspca.c
+++ b/drivers/media/video/gspca/gspca.c
@@ -2063,14 +2063,11 @@ int gspca_dev_probe(struct usb_interface *intf,
                 return -ENODEV;
         }
 
-        /* check the interface class and ignore the sound interfaces */
+        /* the USB video interface must be the first one */
         interface = &intf->cur_altsetting->desc;
-        if (interface->bInterfaceClass != USB_CLASS_VENDOR_SPEC
-            && interface->bInterfaceClass != USB_CLASS_PER_INTERFACE) {
-                PDEBUG(D_PROBE, "Interface class %d not handled here",
-                        interface->bInterfaceClass);
+        if (dev->config->desc.bNumInterfaces != 1 &&
+            interface->bInterfaceNumber != 0)
                 return -ENODEV;
-        }
 
         /* create the device */
         if (dev_size < sizeof *gspca_dev)