From 49b966fa451c74bcb18fff415db0ae9b102fa33f Mon Sep 17 00:00:00 2001
From: Philipp Zabel
Date: Wed, 2 Dec 2015 14:58:53 -0200
Subject: [PATCH] [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
Signed-off-by: Kamil Debski
Signed-off-by: Mauro Carvalho Chehab
---
drivers/media/platform/coda/coda-common.c | 13 +++----------
1 file changed, 3 insertions(+), 10 deletions(-)
diff --git a/drivers/media/platform/coda/coda-common.c b/drivers/media/platform/coda/coda-common.c
index 22f6ceab8f47..6f66a92362ee 100644
--- a/drivers/media/platform/coda/coda-common.c
+++ b/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;
}