[media] coda: don't start streaming without queued buffers

We could support start streaming with an empty output queue for the
BIT decoders due to the bitstream buffer which could still contain
data at this point, but there is really no reason for userspace to
expect this to work. Simplify the code by disallowing it.

Signed-off-by: Philipp Zabel <[email protected]>
Signed-off-by: Kamil Debski <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>

drivers/media/platform/coda/coda-common.c

@@ -1252,6 +1252,9 @@ static int coda_start_streaming(struct vb2_queue *q, unsigned int count)
 	struct vb2_v4l2_buffer *buf;
 	int ret = 0;
 
+	if (count < 1)
+		return -EINVAL;
+
 	q_data_src = get_q_data(ctx, V4L2_BUF_TYPE_VIDEO_OUTPUT);
 	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
 		if (ctx->inst_type == CODA_INST_DECODER && ctx->use_bit) {
@@ -1264,20 +1267,10 @@ static int coda_start_streaming(struct vb2_queue *q, unsigned int count)
 				ret = -EINVAL;
 				goto err;
 			}
-		} else {
-			if (count < 1) {
-				ret = -EINVAL;
-				goto err;
-			}
 		}
 
 		ctx->streamon_out = 1;
 	} else {
-		if (count < 1) {
-			ret = -EINVAL;
-			goto err;
-		}
-
 		ctx->streamon_cap = 1;
 	}