linux-kernel - [PATCH v5 11/16] media: utilize new cdev_device

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Date:   Fri, 17 Mar 2017 12:48:18 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...el.com>
Cc:     linux-pci@...r.kernel.org, linux-scsi@...r.kernel.org,
        rtc-linux@...glegroups.com, linux-mtd@...ts.infradead.org,
        linux-media@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-input@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [PATCH v5 11/16] media: utilize new cdev_device_add helper function

Replace the open coded registration of the cdev and dev with the
new device_add_cdev() helper. The helper replaces a common pattern by
taking the proper reference against the parent device and adding both
the cdev and the device.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
Acked-by: Hans Verkuil <hans.verkuil@...co.com>
---
 drivers/media/cec/cec-core.c  | 16 ++++------------
 drivers/media/media-devnode.c | 20 +++++---------------
 2 files changed, 9 insertions(+), 27 deletions(-)

diff --git a/drivers/media/cec/cec-core.c b/drivers/media/cec/cec-core.c
index 37217e2..3163e03 100644
--- a/drivers/media/cec/cec-core.c
+++ b/drivers/media/cec/cec-core.c
@@ -137,24 +137,17 @@ static int __must_check cec_devnode_register(struct cec_devnode *devnode,
 
 	/* Part 2: Initialize and register the character device */
 	cdev_init(&devnode->cdev, &cec_devnode_fops);
-	devnode->cdev.kobj.parent = &devnode->dev.kobj;
 	devnode->cdev.owner = owner;
 
-	ret = cdev_add(&devnode->cdev, devnode->dev.devt, 1);
-	if (ret < 0) {
-		pr_err("%s: cdev_add failed\n", __func__);
+	ret = cdev_device_add(&devnode->cdev, &devnode->dev);
+	if (ret) {
+		pr_err("%s: cdev_device_add failed\n", __func__);
 		goto clr_bit;
 	}
 
-	ret = device_add(&devnode->dev);
-	if (ret)
-		goto cdev_del;
-
 	devnode->registered = true;
 	return 0;
 
-cdev_del:
-	cdev_del(&devnode->cdev);
 clr_bit:
 	mutex_lock(&cec_devnode_lock);
 	clear_bit(devnode->minor, cec_devnode_nums);
@@ -190,8 +183,7 @@ static void cec_devnode_unregister(struct cec_devnode *devnode)
 	devnode->unregistered = true;
 	mutex_unlock(&devnode->lock);
 
-	device_del(&devnode->dev);
-	cdev_del(&devnode->cdev);
+	cdev_device_del(&devnode->cdev, &devnode->dev);
 	put_device(&devnode->dev);
 }
 
diff --git a/drivers/media/media-devnode.c b/drivers/media/media-devnode.c
index ae46753..423248f 100644
--- a/drivers/media/media-devnode.c
+++ b/drivers/media/media-devnode.c
@@ -248,31 +248,22 @@ int __must_check media_devnode_register(struct media_device *mdev,
 	dev_set_name(&devnode->dev, "media%d", devnode->minor);
 	device_initialize(&devnode->dev);
 
-	/* Part 2: Initialize and register the character device */
+	/* Part 2: Initialize the character device */
 	cdev_init(&devnode->cdev, &media_devnode_fops);
 	devnode->cdev.owner = owner;
-	devnode->cdev.kobj.parent = &devnode->dev.kobj;
 
-	ret = cdev_add(&devnode->cdev, MKDEV(MAJOR(media_dev_t), devnode->minor), 1);
+	/* Part 3: Add the media and char device */
+	ret = cdev_device_add(&devnode->cdev, &devnode->dev);
 	if (ret < 0) {
-		pr_err("%s: cdev_add failed\n", __func__);
+		pr_err("%s: cdev_device_add failed\n", __func__);
 		goto cdev_add_error;
 	}
 
-	/* Part 3: Add the media device */
-	ret = device_add(&devnode->dev);
-	if (ret < 0) {
-		pr_err("%s: device_add failed\n", __func__);
-		goto device_add_error;
-	}
-
 	/* Part 4: Activate this minor. The char device can now be used. */
 	set_bit(MEDIA_FLAG_REGISTERED, &devnode->flags);
 
 	return 0;
 
-device_add_error:
-	cdev_del(&devnode->cdev);
 cdev_add_error:
 	mutex_lock(&media_devnode_lock);
 	clear_bit(devnode->minor, media_devnode_nums);
@@ -298,9 +289,8 @@ void media_devnode_unregister(struct media_devnode *devnode)
 {
 	mutex_lock(&media_devnode_lock);
 	/* Delete the cdev on this minor as well */
-	cdev_del(&devnode->cdev);
+	cdev_device_del(&devnode->cdev, &devnode->dev);
 	mutex_unlock(&media_devnode_lock);
-	device_del(&devnode->dev);
 	devnode->media_dev = NULL;
 	put_device(&devnode->dev);
 }
-- 
2.1.4