linux-kernel - [PATCH v5 06/16] tpm-chip: utilize new cdev_device

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Date:   Fri, 17 Mar 2017 12:48:13 -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 06/16] tpm-chip: 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>
Reviewed-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
---
 drivers/char/tpm/tpm-chip.c | 19 +++----------------
 1 file changed, 3 insertions(+), 16 deletions(-)

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index c406343..935f0e9 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -187,7 +187,6 @@ struct tpm_chip *tpm_chip_alloc(struct device *pdev,
 
 	cdev_init(&chip->cdev, &tpm_fops);
 	chip->cdev.owner = THIS_MODULE;
-	chip->cdev.kobj.parent = &chip->dev.kobj;
 
 	return chip;
 
@@ -230,27 +229,16 @@ static int tpm_add_char_device(struct tpm_chip *chip)
 {
 	int rc;
 
-	rc = cdev_add(&chip->cdev, chip->dev.devt, 1);
+	rc = cdev_device_add(&chip->cdev, &chip->dev);
 	if (rc) {
 		dev_err(&chip->dev,
-			"unable to cdev_add() %s, major %d, minor %d, err=%d\n",
+			"unable to cdev_device_add() %s, major %d, minor %d, err=%d\n",
 			dev_name(&chip->dev), MAJOR(chip->dev.devt),
 			MINOR(chip->dev.devt), rc);
 
 		return rc;
 	}
 
-	rc = device_add(&chip->dev);
-	if (rc) {
-		dev_err(&chip->dev,
-			"unable to device_register() %s, major %d, minor %d, err=%d\n",
-			dev_name(&chip->dev), MAJOR(chip->dev.devt),
-			MINOR(chip->dev.devt), rc);
-
-		cdev_del(&chip->cdev);
-		return rc;
-	}
-
 	/* Make the chip available. */
 	mutex_lock(&idr_lock);
 	idr_replace(&dev_nums_idr, chip, chip->dev_num);
@@ -261,8 +249,7 @@ static int tpm_add_char_device(struct tpm_chip *chip)
 
 static void tpm_del_char_device(struct tpm_chip *chip)
 {
-	cdev_del(&chip->cdev);
-	device_del(&chip->dev);
+	cdev_device_del(&chip->cdev, &chip->dev);
 
 	/* Make the chip unavailable. */
 	mutex_lock(&idr_lock);
-- 
2.1.4