[PATCH 02/10] platform/x86: toshiba_acpi: use devm_add_action_or_reset() for singleton clear

From: Alexandru Ardelean <aardelean@deviqon.com>
To: platform-driver-x86@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org
Cc: coproscefalo@gmail.com, hdegoede@redhat.com,
	mgross@linux.intel.com, jic23@kernel.org, linux@deviqon.com,
	Alexandru Ardelean <aardelean@deviqon.com>
Subject: [PATCH 02/10] platform/x86: toshiba_acpi: use devm_add_action_or_reset() for singleton clear
Date: Wed, 24 Mar 2021 14:55:40 +0200	[thread overview]
Message-ID: <20210324125548.45983-3-aardelean@deviqon.com> (raw)
In-Reply-To: <20210324125548.45983-1-aardelean@deviqon.com>

The only reason to do this is to enforce the ordering of deinitialization,
when the conversion of the device-managed functions is done.

The singleton object should be cleared right before it is free'd.

Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
---
 drivers/platform/x86/toshiba_acpi.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index 6d298810b7bf..c5284601bc2a 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -2995,9 +2995,6 @@ static int toshiba_acpi_remove(struct acpi_device *acpi_dev)
 		rfkill_destroy(dev->wwan_rfk);
 	}
 
-	if (toshiba_acpi)
-		toshiba_acpi = NULL;
-
 	return 0;
 }
 
@@ -3012,6 +3009,11 @@ static const char *find_hci_method(acpi_handle handle)
 	return NULL;
 }
 
+static void toshiba_acpi_singleton_clear(void *data)
+{
+	toshiba_acpi = NULL;
+}
+
 static int toshiba_acpi_add(struct acpi_device *acpi_dev)
 {
 	struct device *parent = &acpi_dev->dev;
@@ -3035,6 +3037,13 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
 	dev = devm_kzalloc(parent, sizeof(*dev), GFP_KERNEL);
 	if (!dev)
 		return -ENOMEM;
+
+	ret = devm_add_action_or_reset(parent,
+				       toshiba_acpi_singleton_clear,
+				       NULL);
+	if (ret)
+		return ret;
+
 	dev->acpi_dev = acpi_dev;
 	dev->method_hci = hci_method;
 	dev->miscdev.minor = MISC_DYNAMIC_MINOR;
-- 
2.30.2

