+/*
+ * iss_pipeline_disable - Disable streaming on a pipeline
+ * @pipe: ISS pipeline
+ * @until: entity at which to stop pipeline walk
+ *
+ * Walk the entities chain starting at the pipeline output video node and stop
+ * all modules in the chain. Wait synchronously for the modules to be stopped if
+ * necessary.
+ *
+ * If the until argument isn't NULL, stop the pipeline walk when reaching the
+ * until entity. This is used to disable a partially started pipeline due to a
+ * subdev start error.
+ */
+static int iss_pipeline_disable(struct iss_pipeline *pipe,
+ struct media_entity *until)
+{
+ struct iss_device *iss = pipe->output->iss;
+ struct media_entity *entity;
+ struct media_pad *pad;
+ struct v4l2_subdev *subdev;
+ int failure = 0;
+ int ret;
+
+ entity = &pipe->output->video.entity;
+ while (1) {
+ pad = &entity->pads[0];
+ if (!(pad->flags & MEDIA_PAD_FL_SINK))
+ break;
+
+ pad = media_entity_remote_pad(pad);
+ if (pad == NULL ||
+ media_entity_type(pad->entity) != MEDIA_ENT_T_V4L2_SUBDEV)
+ break;
+
+ entity = pad->entity;
+ if (entity == until)
+ break;
+
+ subdev = media_entity_to_v4l2_subdev(entity);
+ ret = v4l2_subdev_call(subdev, video, s_stream, 0);
+ if (ret < 0) {
+ dev_dbg(iss->dev, "%s: module stop timeout.\n",
+ subdev->name);
+ /* If the entity failed to stopped, assume it has
+ * crashed. Mark it as such, the ISS will be reset when
+ * applications will release it.
+ */
+ iss->crashed |= 1U << subdev->entity.id;
+ failure = -ETIMEDOUT;
+ }
+ }
+
+ return failure;
+}
+