linux-kernel - [PATCH v3 11/17] media: imx: csi: Embed notifier in struct csi

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Message-Id: <20200204234918.20425-12-slongerbeam@gmail.com>
Date:   Tue,  4 Feb 2020 15:49:12 -0800
From:   Steve Longerbeam <slongerbeam@...il.com>
To:     linux-media@...r.kernel.org, Rui Miguel Silva <rmfrfs@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Steve Longerbeam <slongerbeam@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        devel@...verdev.osuosl.org (open list:STAGING SUBSYSTEM),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/FREESCALE IMX
        / MXC ARM ARCHITECTURE), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3 11/17] media: imx: csi: Embed notifier in struct csi_priv

Embed the notifier in 'struct csi_priv', instead of dynamically allocating
it, to make it possible to retrieve csi_priv in a notifier callback op.

Signed-off-by: Steve Longerbeam <slongerbeam@...il.com>
---
 drivers/staging/media/imx/imx-media-csi.c | 25 +++++++++--------------
 1 file changed, 10 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index dc5fe25fe7b8..3e2afdd59276 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -58,6 +58,8 @@ struct csi_priv {
 	struct ipu_soc *ipu;
 	struct v4l2_subdev sd;
 	struct media_pad pad[CSI_NUM_PADS];
+	struct v4l2_async_notifier notifier;
+
 	/* the video device at IDMAC output pad */
 	struct imx_media_video_dev *vdev;
 	struct imx_media_fim *fim;
@@ -1896,31 +1898,28 @@ static int imx_csi_parse_endpoint(struct device *dev,
 
 static int imx_csi_async_register(struct csi_priv *priv)
 {
-	struct v4l2_async_notifier *notifier;
 	struct fwnode_handle *fwnode;
 	unsigned int port;
 	int ret;
 
-	notifier = kzalloc(sizeof(*notifier), GFP_KERNEL);
-	if (!notifier)
-		return -ENOMEM;
-
-	v4l2_async_notifier_init(notifier);
+	v4l2_async_notifier_init(&priv->notifier);
 
 	fwnode = dev_fwnode(priv->dev);
 
 	/* get this CSI's port id */
 	ret = fwnode_property_read_u32(fwnode, "reg", &port);
 	if (ret < 0)
-		goto out_free;
+		return ret;
 
 	ret = v4l2_async_notifier_parse_fwnode_endpoints_by_port(
-		priv->dev->parent, notifier, sizeof(struct v4l2_async_subdev),
+		priv->dev->parent, &priv->notifier,
+		sizeof(struct v4l2_async_subdev),
 		port, imx_csi_parse_endpoint);
 	if (ret < 0)
 		goto out_cleanup;
 
-	ret = v4l2_async_subdev_notifier_register(&priv->sd, notifier);
+	ret = v4l2_async_subdev_notifier_register(&priv->sd,
+						  &priv->notifier);
 	if (ret < 0)
 		goto out_cleanup;
 
@@ -1928,16 +1927,12 @@ static int imx_csi_async_register(struct csi_priv *priv)
 	if (ret < 0)
 		goto out_unregister;
 
-	priv->sd.subdev_notifier = notifier;
-
 	return 0;
 
 out_unregister:
-	v4l2_async_notifier_unregister(notifier);
+	v4l2_async_notifier_unregister(&priv->notifier);
 out_cleanup:
-	v4l2_async_notifier_cleanup(notifier);
-out_free:
-	kfree(notifier);
+	v4l2_async_notifier_cleanup(&priv->notifier);
 
 	return ret;
 }
-- 
2.17.1