1 files changed, 45 insertions, 2 deletions

diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c
index fabe45c4163..f1dfcff44e1 100644
--- a/drivers/media/video/videobuf-core.c
+++ b/drivers/media/video/videobuf-core.c
@@ -793,6 +793,49 @@ done:
 	return retval;
 }
 
+static int __videobuf_copy_to_user(struct videobuf_queue *q,
+				   struct videobuf_buffer *buf,
+				   char __user *data, size_t count,
+				   int nonblocking)
+{
+	void *vaddr = CALL(q, vaddr, buf);
+
+	/* copy to userspace */
+	if (count > buf->size - q->read_off)
+		count = buf->size - q->read_off;
+
+	if (copy_to_user(data, vaddr + q->read_off, count))
+		return -EFAULT;
+
+	return count;
+}
+
+static int __videobuf_copy_stream(struct videobuf_queue *q,
+				  struct videobuf_buffer *buf,
+				  char __user *data, size_t count, size_t pos,
+				  int vbihack, int nonblocking)
+{
+	unsigned int *fc = CALL(q, vaddr, buf);
+
+	if (vbihack) {
+		/* dirty, undocumented hack -- pass the frame counter
+			* within the last four bytes of each vbi data block.
+			* We need that one to maintain backward compatibility
+			* to all vbi decoding software out there ... */
+		fc += (buf->size >> 2) - 1;
+		*fc = buf->field_count >> 1;
+		dprintk(1, "vbihack: %d\n", *fc);
+	}
+
+	/* copy stuff using the common method */
+	count = __videobuf_copy_to_user(q, buf, data, count, nonblocking);
+
+	if ((count == -EFAULT) && (pos == 0))
+		return -EFAULT;
+
+	return count;
+}
+
 ssize_t videobuf_read_one(struct videobuf_queue *q,
 			  char __user *data, size_t count, loff_t *ppos,
 			  int nonblocking)
@@ -861,7 +904,7 @@ ssize_t videobuf_read_one(struct videobuf_queue *q,
 	}
 
 	/* Copy to userspace */
-	retval = CALL(q, video_copy_to_user, q, data, count, nonblocking);
+	retval = __videobuf_copy_to_user(q, q->read_buf, data, count, nonblocking);
 	if (retval < 0)
 		goto done;
 
@@ -1003,7 +1046,7 @@ ssize_t videobuf_read_stream(struct videobuf_queue *q,
 		}
 
 		if (q->read_buf->state == VIDEOBUF_DONE) {
-			rc = CALL(q, copy_stream, q, data + retval, count,
+			rc = __videobuf_copy_stream(q, q->read_buf, data + retval, count,
 					retval, vbihack, nonblocking);
 			if (rc < 0) {
 				retval = rc;