Re: [PATCH 02/15] media: staging/imx7: add imx7 CSI subdev driver

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Hi,
On Thu 19 Apr 2018 at 12:22, Dan Carpenter wrote:
On Thu, Apr 19, 2018 at 11:17:59AM +0100, Rui Miguel Silva wrote:
+static int imx7_csi_link_setup(struct media_entity *entity,
+			       const struct media_pad *local,
+ const struct media_pad *remote, u32 flags)
+{
+ struct v4l2_subdev *sd = media_entity_to_v4l2_subdev(entity);
+	struct imx7_csi *csi = v4l2_get_subdevdata(sd);
+	struct v4l2_subdev *remote_sd;
+	int ret = 0;
+
+ dev_dbg(csi->dev, "link setup %s -> %s\n", remote->entity->name,
+		local->entity->name);
+
+	mutex_lock(&csi->lock);
+
+	if (local->flags & MEDIA_PAD_FL_SINK) {
+ if (!is_media_entity_v4l2_subdev(remote->entity)) {
+			ret = -EINVAL;
+			goto unlock;
+		}
+
+ remote_sd = media_entity_to_v4l2_subdev(remote->entity);
+
+		if (flags & MEDIA_LNK_FL_ENABLED) {
+			if (csi->src_sd) {
+				ret = -EBUSY;
+				goto unlock;
+			}
+			csi->src_sd = remote_sd;
+		} else {
+			csi->src_sd = NULL;
+		}
+
+		goto init;
+	}
+
+	/* source pad */
+	if (flags & MEDIA_LNK_FL_ENABLED) {
+		if (csi->sink) {
+			ret = -EBUSY;
+			goto unlock;
+		}
+		csi->sink = remote->entity;
+	} else {
+		v4l2_ctrl_handler_free(&csi->ctrl_hdlr);
+		v4l2_ctrl_handler_init(&csi->ctrl_hdlr, 0);
+		csi->sink = NULL;
+	}
+
+init:
+	if (csi->sink || csi->src_sd)
+		imx7_csi_init(csi);
+	else
+		imx7_csi_deinit(csi);
+
+unlock:
+	mutex_unlock(&csi->lock);
+
+	return 0;

This should be "return ret;" because the failure paths go through here
as well.

Agree.


+}
+
+static int imx7_csi_pad_link_validate(struct v4l2_subdev *sd,
+				      struct media_link *link,
+ struct v4l2_subdev_format *source_fmt, + struct v4l2_subdev_format *sink_fmt)
+{
+	struct imx7_csi *csi = v4l2_get_subdevdata(sd);
+	struct v4l2_fwnode_endpoint upstream_ep;
+	int ret;
+
+ ret = v4l2_subdev_link_validate_default(sd, link, source_fmt, sink_fmt);
+	if (ret)
+		return ret;
+
+ ret = imx7_csi_get_upstream_endpoint(csi, &upstream_ep, true);
+	if (ret) {
+ v4l2_err(&csi->sd, "failed to find upstream endpoint\n");
+		return ret;
+	}
+
+	mutex_lock(&csi->lock);
+
+	csi->upstream_ep = upstream_ep;
+	csi->is_csi2 = (upstream_ep.bus_type == V4L2_MBUS_CSI2);
+
+	mutex_unlock(&csi->lock);
+
+	return ret;

return 0;

ack.


+}
+

[ snip ]

+
+static int imx7_csi_remove(struct platform_device *pdev)
+{
+	return 0;
+}

There is no need for this empty (struct platform_driver)->remove()
function.  See platform_drv_remove() for how it's called.

right.


This looks nice, though.

Thanks,
---
Cheers,
	Rui

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