V4L/DVB (11105): gspca - ov534: Adjust the packet scan function

- change max payload size to 2040 bytes (was 2048)
- optimize
Signed-off-by: NJean-Francois Moine <moinejf@free.fr>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/gspca/ov534.c

@@ -46,9 +46,9 @@ MODULE_LICENSE("GPL");
 /* specific webcam descriptor */
 struct sd {
 	struct gspca_dev gspca_dev;	/* !! must be the first item */
-	__u32 last_fid;
 	__u32 last_pts;
-	int frame_rate;
+	u16 last_fid;
+	u8 frame_rate;
 };
 
 /* V4L2 controls supported by the driver */
@@ -428,18 +428,11 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev, struct gspca_frame *frame,
 {
 	struct sd *sd = (struct sd *) gspca_dev;
 	__u32 this_pts;
-	int this_fid;
+	u16 this_fid;
 	int remaining_len = len;
-	__u8 *next_data = data;
 
-scan_next:
-	if (remaining_len <= 0)
-		return;
-
-	data = next_data;
-	len = min(remaining_len, 2048);
-	remaining_len -= len;
-	next_data += len;
+	do {
+		len = min(remaining_len, 2040);		/*fixme: was 2048*/
 
 		/* Payloads are prefixed with a UVC-style header.  We
 		   consider a frame to start when the FID toggles, or the PTS
@@ -463,12 +456,14 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev, struct gspca_frame *frame,
 			PDEBUG(D_PACK, "PTS not present");
 			goto discard;
 		}
-	this_pts = (data[5] << 24) | (data[4] << 16) | (data[3] << 8) | data[2];
+		this_pts = (data[5] << 24) | (data[4] << 16)
+						| (data[3] << 8) | data[2];
 		this_fid = (data[1] & UVC_STREAM_FID) ? 1 : 0;
 
 		/* If PTS or FID has changed, start a new frame. */
 		if (this_pts != sd->last_pts || this_fid != sd->last_fid) {
-		gspca_frame_add(gspca_dev, FIRST_PACKET, frame, NULL, 0);
+			gspca_frame_add(gspca_dev, FIRST_PACKET, frame,
+					NULL, 0);
 			sd->last_pts = this_pts;
 			sd->last_fid = this_fid;
 		}
@@ -481,8 +476,8 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev, struct gspca_frame *frame,
 		if (data[1] & UVC_STREAM_EOF) {
 			sd->last_pts = 0;
 
-		if ((frame->data_end - frame->data) !=
-		    (gspca_dev->width * gspca_dev->height * 2)) {
+			if (frame->data_end - frame->data !=
+			    gspca_dev->width * gspca_dev->height * 2) {
 				PDEBUG(D_PACK, "short frame");
 				goto discard;
 			}
@@ -497,7 +492,11 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev, struct gspca_frame *frame,
 discard:
 		/* Discard data until a new frame starts. */
 		gspca_frame_add(gspca_dev, DISCARD_PACKET, frame, NULL, 0);
-	goto scan_next;
+
+scan_next:
+		remaining_len -= len;
+		data += len;
+	} while (remaining_len > 0);
 }
 
 /* get stream parameters (framerate) */