linux-kernel - [PATCH 08/10] platform/x86: toshiba_acpi: use device-managed for wwan

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Message-Id: <20210324125548.45983-9-aardelean@deviqon.com>
Date:   Wed, 24 Mar 2021 14:55:46 +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 08/10] platform/x86: toshiba_acpi: use device-managed for wwan_rfkill management

This change converts the wwan_rfkill object to be free'd automatically when
the parent refcount goes to zero.
There are 2 cleanup operations required: rfkill_unregister() and
rfkill_destroy(). Since they don't have any devm_ variants, they are hooked
via devm_add_action_or_reset().

The main reason to do this is to enforce ordering on cleanup, when the
Toshiba ACPI device is cleaned up.

Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>
---
 drivers/platform/x86/toshiba_acpi.c | 40 ++++++++++++++++++++++-------
 1 file changed, 31 insertions(+), 9 deletions(-)

diff --git a/drivers/platform/x86/toshiba_acpi.c b/drivers/platform/x86/toshiba_acpi.c
index 12860ef60e4d..a1249f6dde9a 100644
--- a/drivers/platform/x86/toshiba_acpi.c
+++ b/drivers/platform/x86/toshiba_acpi.c
@@ -2591,7 +2591,22 @@ static const struct rfkill_ops wwan_rfk_ops = {
 	.poll = toshiba_acpi_wwan_poll,
 };
 
-static int toshiba_acpi_setup_wwan_rfkill(struct toshiba_acpi_dev *dev)
+static void toshiba_acpi_rfkill_destroy(void *data)
+{
+	struct rfkill *wwan_rfk = data;
+
+	rfkill_destroy(wwan_rfk);
+}
+
+static void toshiba_acpi_rfkill_unreg(void *data)
+{
+	struct rfkill *wwan_rfk = data;
+
+	rfkill_unregister(wwan_rfk);
+}
+
+static int toshiba_acpi_setup_wwan_rfkill(struct device *parent,
+					  struct toshiba_acpi_dev *dev)
 {
 	int ret = toshiba_wireless_status(dev);
 
@@ -2608,15 +2623,27 @@ static int toshiba_acpi_setup_wwan_rfkill(struct toshiba_acpi_dev *dev)
 		return -ENOMEM;
 	}
 
+	ret = devm_add_action_or_reset(parent, toshiba_acpi_rfkill_destroy,
+				       dev->wwan_rfk);
+	if (ret)
+		return ret;
+
 	rfkill_set_hw_state(dev->wwan_rfk, !dev->killswitch);
 
 	ret = rfkill_register(dev->wwan_rfk);
 	if (ret) {
 		pr_err("Unable to register WWAN rfkill device\n");
-		rfkill_destroy(dev->wwan_rfk);
+		return ret;
 	}
 
-	return ret;
+	ret = devm_add_action_or_reset(parent, toshiba_acpi_rfkill_unreg,
+				       dev->wwan_rfk);
+	if (ret) {
+		dev->wwan_rfk = NULL;
+		return ret;
+	}
+
+	return 0;
 }
 
 /*
@@ -2996,11 +3023,6 @@ static int toshiba_acpi_remove(struct acpi_device *acpi_dev)
 		sysfs_remove_group(&dev->acpi_dev->dev.kobj,
 				   &toshiba_attr_group);
 
-	if (dev->wwan_rfk) {
-		rfkill_unregister(dev->wwan_rfk);
-		rfkill_destroy(dev->wwan_rfk);
-	}
-
 	return 0;
 }
 
@@ -3189,7 +3211,7 @@ static int toshiba_acpi_add(struct acpi_device *acpi_dev)
 
 	toshiba_wwan_available(dev);
 	if (dev->wwan_supported)
-		toshiba_acpi_setup_wwan_rfkill(dev);
+		toshiba_acpi_setup_wwan_rfkill(parent, dev);
 
 	toshiba_cooling_method_available(dev);
 
-- 
2.30.2