[media] vb2: Handle return value from start_streaming callback

Fix vb2 not handling return value from start_streaming() callback.

Signed-off-by: Pawel Osciak <pawel@osciak.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/media/video/videobuf2-core.c b/drivers/media/video/videobuf2-core.c
index 8c6f04bc4d89..6698c77e0f64 100644
--- a/drivers/media/video/videobuf2-core.c
+++ b/drivers/media/video/videobuf2-core.c
@@ -1111,6 +1111,7 @@ EXPORT_SYMBOL_GPL(vb2_dqbuf);
 int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
 {
         struct vb2_buffer *vb;
+        int ret;
 
         if (q->fileio) {
                 dprintk(1, "streamon: file io in progress\n");
@@ -1138,12 +1139,16 @@ int vb2_streamon(struct vb2_queue *q, enum v4l2_buf_type type)
                 }
         }
 
-        q->streaming = 1;
-
         /*
          * Let driver notice that streaming state has been enabled.
          */
-        call_qop(q, start_streaming, q);
+        ret = call_qop(q, start_streaming, q);
+        if (ret) {
+                dprintk(1, "streamon: driver refused to start streaming\n");
+                return ret;
+        }
+
+        q->streaming = 1;
 
         /*
          * If any buffers were queued before streamon,