linux-kernel - [PATCH v5 10/16] iio:core: utilize new cdev_device

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Date:   Fri, 17 Mar 2017 12:48:17 -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 10/16] iio:core: 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.

In doing so we have to remove a guard statement from cdev_del,
but this doesn't appear to be required in any way.

Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
 drivers/iio/industrialio-core.c | 15 ++++-----------
 1 file changed, 4 insertions(+), 11 deletions(-)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index d18ded4..26a03c6 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1720,18 +1720,13 @@ int iio_device_register(struct iio_dev *indio_dev)
 
 	cdev_init(&indio_dev->chrdev, &iio_buffer_fileops);
 	indio_dev->chrdev.owner = indio_dev->info->driver_module;
-	indio_dev->chrdev.kobj.parent = &indio_dev->dev.kobj;
-	ret = cdev_add(&indio_dev->chrdev, indio_dev->dev.devt, 1);
-	if (ret < 0)
-		goto error_unreg_eventset;
 
-	ret = device_add(&indio_dev->dev);
+	ret = cdev_device_add(&indio_dev->chrdev, &indio_dev->dev);
 	if (ret < 0)
-		goto error_cdev_del;
+		goto error_unreg_eventset;
 
 	return 0;
-error_cdev_del:
-	cdev_del(&indio_dev->chrdev);
+
 error_unreg_eventset:
 	iio_device_unregister_eventset(indio_dev);
 error_free_sysfs:
@@ -1752,10 +1747,8 @@ void iio_device_unregister(struct iio_dev *indio_dev)
 {
 	mutex_lock(&indio_dev->info_exist_lock);
 
-	device_del(&indio_dev->dev);
+	cdev_device_del(&indio_dev->chrdev, &indio_dev->dev);
 
-	if (indio_dev->chrdev.dev)
-		cdev_del(&indio_dev->chrdev);
 	iio_device_unregister_debugfs(indio_dev);
 
 	iio_disable_all_buffers(indio_dev);
-- 
2.1.4