linux-kernel - [PATCH 09/10] platform/x86: toshiba_acpi: use device-managed for sysfs removal

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Date:   Wed, 24 Mar 2021 14:55:47 +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 09/10] platform/x86: toshiba_acpi: use device-managed for sysfs removal

This change moves the creation of the Toshiba ACPI group to be
automatically removed when the parent refcount goes to zero.

The main reason to do this, is to also enforce that the order of removal is
mirroring the order of initialization.

Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>
---
 drivers/platform/x86/toshiba_acpi.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index a1249f6dde9a..8e8917979047 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -200,7 +200,6 @@ struct toshiba_acpi_dev {
 	unsigned int usb_three_supported:1;
 	unsigned int wwan_supported:1;
 	unsigned int cooling_method_supported:1;
-	unsigned int sysfs_created:1;
 	unsigned int special_functions;
 
 	bool kbd_event_generated;
@@ -3019,10 +3018,6 @@ static int toshiba_acpi_remove(struct acpi_device *acpi_dev)
 
 	remove_toshiba_proc_entries(dev);
 
-	if (dev->sysfs_created)
-		sysfs_remove_group(&dev->acpi_dev->dev.kobj,
-				   &toshiba_attr_group);
-
 	return 0;
 }
 
@@ -3049,6 +3044,13 @@ static void toshiba_acpi_misc_deregister(void *data)
 	misc_deregister(miscdev);
 }
 
+static void toshiba_acpi_sysfs_remove(void *data)
+{
+	struct kobject *kobj = data;
+
+	sysfs_remove_group(kobj, &toshiba_attr_group);
+}
+
 static int toshiba_acpi_add(struct acpi_device *acpi_dev)
 {
 	struct device *parent = &acpi_dev->dev;
@@ -3219,21 +3221,20 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
 
 	ret = sysfs_create_group(&dev->acpi_dev->dev.kobj,
 				 &toshiba_attr_group);
-	if (ret) {
-		dev->sysfs_created = 0;
-		goto error;
-	}
-	dev->sysfs_created = !ret;
+	if (ret)
+		return ret;
+
+	ret = devm_add_action_or_reset(parent,
+				       toshiba_acpi_sysfs_remove,
+				       &dev->acpi_dev->dev.kobj);
+	if (ret)
+		return ret;
 
 	create_toshiba_proc_entries(dev);
 
 	toshiba_acpi = dev;
 
 	return 0;
-
-error:
-	toshiba_acpi_remove(acpi_dev);
-	return ret;
 }
 
 static void toshiba_acpi_notify(struct acpi_device *acpi_dev, u32 event)
-- 
2.30.2