[media] uvcvideo: Fix alternate setting selection

The alternate setting number is not equal to the alternate setting index
in the interface alternate settings table. Use the alternate setting
number from the interface descriptor when calling usb_set_interface().

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c
index 39f5c85dd4b4e5c5e5c8a5c00805411a991c276e..7ac4347ca09e72dc4bb2abb751779f3053a338c7 100644 (file)
--- a/drivers/media/video/uvc/uvc_video.c
+++ b/drivers/media/video/uvc/uvc_video.c
@@ -1598,7 +1598,7 @@ static int uvc_init_video(struct uvc_streaming *stream, gfp_t gfp_flags)
                        psize = le16_to_cpu(ep->desc.wMaxPacketSize);
                        psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
                        if (psize >= bandwidth && psize <= best_psize) {
-                               altsetting = i;
+                               altsetting = alts->desc.bAlternateSetting;
                                best_psize = psize;
                                best_ep = ep;
                        }