V4L/DVB (13866): gspca - main: Add the cam flag 'no_urb_create'.

This flag permits subdrivers to create specific transfer URBs.
Signed-off-by: NJean-Francois Moine <moinejf@free.fr>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/gspca.c

@@ -607,11 +607,14 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev)
 		goto out;
 	}
 	for (;;) {
-		PDEBUG(D_STREAM, "init transfer alt %d", gspca_dev->alt);
-		ret = create_urbs(gspca_dev, ep);
-		if (ret < 0) {
-			destroy_urbs(gspca_dev);
-			goto out;
+		if (!gspca_dev->cam.no_urb_create) {
+			PDEBUG(D_STREAM, "init transfer alt %d",
+				gspca_dev->alt);
+			ret = create_urbs(gspca_dev, ep);
+			if (ret < 0) {
+				destroy_urbs(gspca_dev);
+				goto out;
+			}
 		}
 
 		/* clear the bulk endpoint */

drivers/media/video/gspca/gspca.h

@@ -54,20 +54,21 @@ struct framerates {
 
 /* device information - set at probe time */
 struct cam {
-	int bulk_size;		/* buffer size when image transfer by bulk */
 	const struct v4l2_pix_format *cam_mode;	/* size nmodes */
-	char nmodes;
 	const struct framerates *mode_framerates; /* must have size nmode,
 						   * just like cam_mode */
-	__u8 bulk_nurbs;	/* number of URBs in bulk mode
+	u32 bulk_size;		/* buffer size when image transfer by bulk */
+	u32 input_flags;	/* value for ENUM_INPUT status flags */
+	u8 nmodes;		/* size of cam_mode */
+	u8 no_urb_create;	/* don't create transfer URBs */
+	u8 bulk_nurbs;		/* number of URBs in bulk mode
 				 * - cannot be > MAX_NURBS
 				 * - when 0 and bulk_size != 0 means
 				 *   1 URB and submit done by subdriver */
 	u8 bulk;		/* image transfer by 0:isoc / 1:bulk */
 	u8 npkt;		/* number of packets in an ISOC message
 				 * 0 is the default value: 32 packets */
-	u32 input_flags;	/* value for ENUM_INPUT status flags */
-	char reverse_alts;	/* Alt settings are in high to low order */
+	u8 reverse_alts;	/* Alt settings are in high to low order */
 };
 
 struct gspca_dev;