V4L/DVB (9857): gspca: Use smaller chunks for urb buffer in ov534.

Signed-off-by: Antonio Ospite <ospite@studenti.unina.it>
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 30 insertions, 16 deletions

diff --git a/drivers/media/video/gspca/ov534.c b/drivers/media/video/gspca/ov534.c
index 530f0b712166..a1c31bc53a3d 100644
--- a/drivers/media/video/gspca/ov534.c
+++ b/drivers/media/video/gspca/ov534.c
@@ -346,7 +346,14 @@ static int sd_config(struct gspca_dev *gspca_dev,
         cam->cam_mode = vga_mode;
         cam->nmodes = ARRAY_SIZE(vga_mode);
 
-        cam->bulk_size = vga_mode[0].sizeimage;
+        /*
+         * On some architectures we need contiguous memory for urb buffers, and
+         * in low memory situation 'sizeimage' can be too much.
+         * 16kiB chunks should be available even when we are low in memory.
+         * TODO: CHECK this description: is the problem arch-dependent or more
+         *       general?
+         */
+        cam->bulk_size = 16 * 1024;
         cam->bulk_nurbs = 2;
 
         PDEBUG(D_PROBE, "bulk_size = %d", cam->bulk_size);
@@ -395,15 +402,19 @@ static int sd_init(struct gspca_dev *gspca_dev)
 
 static int sd_start(struct gspca_dev *gspca_dev)
 {
-        PDEBUG(D_PROBE, "width = %d, height = %d",
-               gspca_dev->width, gspca_dev->height);
-
-        gspca_dev->cam.bulk_size = gspca_dev->width * gspca_dev->height * 2;
+        struct gspca_frame *frame;
 
         /* start streaming data */
         ov534_set_led(gspca_dev->dev, 1);
         ov534_reg_write(gspca_dev->dev, 0xe0, 0x00);
 
+        frame = gspca_get_i_frame(gspca_dev);
+        if (frame == NULL) {
+                PDEBUG(D_ERR, "NULL frame!");
+                return -1;
+        }
+        gspca_frame_add(gspca_dev, FIRST_PACKET, frame, gspca_dev->usb_buf, 0);
+
         return 0;
 }
 
@@ -421,18 +432,21 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev, struct gspca_frame *frame,
          * The current camera setup doesn't stream the last pixel, so we set it
          * to a dummy value
          */
-        __u8 last_pixel[4] = { 0, 0, 0, 0 };
-        int framesize = gspca_dev->cam.bulk_size;
-
-        if (len == framesize - 4) {
-                frame =
-                    gspca_frame_add(gspca_dev, FIRST_PACKET, frame, data, len);
-                frame =
-                    gspca_frame_add(gspca_dev, LAST_PACKET, frame, last_pixel,
-                                    4);
+        __u8 last[4] = { 0, 0, 0, 0 };
+        int framesize = frame->v4l2_buf.length;
+
+        PDEBUG(D_PACK, "");
+        PDEBUG(D_PACK, "** packet len = %d, framesize = %d", len, framesize);
+        PDEBUG(D_PACK, "** frame->data_end - frame->data + len = %d",
+                        frame->data_end - frame->data + len);
+
+        if (frame->data_end - frame->data + len == framesize - 4) {
+                PDEBUG(D_PACK, "   end of frame!");
+                gspca_frame_add(gspca_dev, INTER_PACKET, frame, data, len);
+                frame = gspca_frame_add(gspca_dev, LAST_PACKET, frame, last, 4);
+                gspca_frame_add(gspca_dev, FIRST_PACKET, frame, data, 0);
         } else
-                PDEBUG(D_PACK, "packet len = %d, framesize = %d", len,
-                       framesize);
+                gspca_frame_add(gspca_dev, INTER_PACKET, frame, data, len);
 }
 
 /* sub-driver description */