From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Date: Mon, 15 Feb 2021 04:26:39 +0000 (+0100)
Subject: media: imx: capture: Register the video device after completing init
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=1f4e7241704baa2f9c52627439a32a92625e1f06;p=linux.git

media: imx: capture: Register the video device after completing init

When the video device is registered, it can get used by userspace
immediately. Its initialization must thus be fully complete. Ensure this
by registering the video device after all initialization steps.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---

diff --git a/drivers/staging/media/imx/imx-media-capture.c b/drivers/staging/media/imx/imx-media-capture.c
index 78b6e592692f6..cd0ad2b32bbfb 100644
--- a/drivers/staging/media/imx/imx-media-capture.c
+++ b/drivers/staging/media/imx/imx-media-capture.c
@@ -723,27 +723,13 @@ int imx_media_capture_device_register(struct imx_media_video_dev *vdev)
 
 	vfd->v4l2_dev = v4l2_dev;
 
-	ret = video_register_device(vfd, VFL_TYPE_VIDEO, -1);
-	if (ret) {
-		dev_err(priv->dev, "Failed to register video device\n");
-		return ret;
-	}
-
-	/* create the link from the src_sd devnode pad to device node */
-	ret = media_create_pad_link(&sd->entity, priv->src_sd_pad,
-				    &vfd->entity, 0, 0);
-	if (ret) {
-		dev_err(priv->dev, "failed to create link to device node\n");
-		goto unreg;
-	}
-
 	/* setup default format */
 	fmt_src.pad = priv->src_sd_pad;
 	fmt_src.which = V4L2_SUBDEV_FORMAT_ACTIVE;
 	ret = v4l2_subdev_call(sd, pad, get_fmt, NULL, &fmt_src);
 	if (ret) {
 		dev_err(priv->dev, "failed to get src_sd format\n");
-		goto unreg;
+		return ret;
 	}
 
 	vdev->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@@ -754,16 +740,29 @@ int imx_media_capture_device_register(struct imx_media_video_dev *vdev)
 	vdev->cc = imx_media_find_pixel_format(vdev->fmt.fmt.pix.pixelformat,
 					       PIXFMT_SEL_ANY);
 
+	/* Register the video device. */
+	ret = video_register_device(vfd, VFL_TYPE_VIDEO, -1);
+	if (ret) {
+		dev_err(priv->dev, "Failed to register video device\n");
+		return ret;
+	}
+
 	dev_info(priv->dev, "Registered %s as /dev/%s\n", vfd->name,
 		 video_device_node_name(vfd));
 
-	/* add vdev to the video device list */
+	/* Create the link from the src_sd devnode pad to device node. */
+	ret = media_create_pad_link(&sd->entity, priv->src_sd_pad,
+				    &vfd->entity, 0, 0);
+	if (ret) {
+		dev_err(priv->dev, "failed to create link to device node\n");
+		video_unregister_device(vfd);
+		return ret;
+	}
+
+	/* Add vdev to the video devices list. */
 	imx_media_add_video_device(priv->md, vdev);
 
 	return 0;
-unreg:
-	video_unregister_device(vfd);
-	return ret;
 }
 EXPORT_SYMBOL_GPL(imx_media_capture_device_register);