linux-kernel - [PATCH 03/10] platform/x86: toshiba_acpi: bind registration of miscdev object to parent

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Date:   Wed, 24 Mar 2021 14:55:41 +0200
From:   Alexandru Ardelean <aardelean@...iqon.com>
To:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-iio@...r.kernel.org
Cc:     coproscefalo@...il.com, hdegoede@...hat.com,
        mgross@...ux.intel.com, jic23@...nel.org, linux@...iqon.com,
        Alexandru Ardelean <aardelean@...iqon.com>
Subject: [PATCH 03/10] platform/x86: toshiba_acpi: bind registration of miscdev object to parent

This change moves the registration of the Toshiba ACPI miscdev to be
handled by the devm_add_action_or_reset() hook. This way, the miscdev will
be unregistered when the reference count of the parent device object goes
to zero.

This also changes the order of cleanup in toshiba_acpi_remove(), where the
miscdev was deregistered first. Now it will be deregistered right before
the toshiba_acpi_dev object is free'd.

Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>
---
 drivers/platform/x86/toshiba_acpi.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index c5284601bc2a..53ef565378ef 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -2963,8 +2963,6 @@ static int toshiba_acpi_remove(struct acpi_device *acpi_dev)
 {
 	struct toshiba_acpi_dev *dev = acpi_driver_data(acpi_dev);
 
-	misc_deregister(&dev->miscdev);
-
 	remove_toshiba_proc_entries(dev);
 
 	if (dev->accelerometer_supported && dev->indio_dev) {
@@ -3014,6 +3012,13 @@ static void toshiba_acpi_singleton_clear(void *data)
 	toshiba_acpi = NULL;
 }
 
+static void toshiba_acpi_misc_deregister(void *data)
+{
+	struct miscdevice *miscdev = data;
+
+	misc_deregister(miscdev);
+}
+
 static int toshiba_acpi_add(struct acpi_device *acpi_dev)
 {
 	struct device *parent = &acpi_dev->dev;
@@ -3056,6 +3061,11 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
 		return ret;
 	}
 
+	ret = devm_add_action_or_reset(parent, toshiba_acpi_misc_deregister,
+				       &dev->miscdev);
+	if (ret)
+		return ret;
+
 	acpi_dev->driver_data = dev;
 	dev_set_drvdata(&acpi_dev->dev, dev);
 
-- 
2.30.2