linux-kernel - [PATCH v7 6/8] leds: nic78bx: use devm API to cleanup module's resources

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Date: Thu, 14 Mar 2024 23:18:54 +0300
From: George Stark <gnstark@...utedevices.com>
To: <andy.shevchenko@...il.com>, <pavel@....cz>, <lee@...nel.org>,
	<vadimp@...dia.com>, <christophe.leroy@...roup.eu>, <hdegoede@...hat.com>,
	<mazziesaccount@...il.com>, <peterz@...radead.org>, <mingo@...hat.com>,
	<will@...nel.org>, <longman@...hat.com>, <boqun.feng@...il.com>,
	<nikitos.tr@...il.com>, <marek.behun@....cz>, <kabel@...nel.org>
CC: <linux-leds@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<kernel@...utedevices.com>, George Stark <gnstark@...utedevices.com>
Subject: [PATCH v7 6/8] leds: nic78bx: use devm API to cleanup module's resources

In this driver LEDs are registered using devm_led_classdev_register()
so they are automatically unregistered after module's remove() is done.
led_classdev_unregister() calls module's led_set_brightness() to turn off
the LEDs and that callback uses resources which were destroyed already
in module's remove() so use devm API instead of remove().

Signed-off-by: George Stark <gnstark@...utedevices.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
---
 drivers/leds/leds-nic78bx.c | 23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

diff --git a/drivers/leds/leds-nic78bx.c b/drivers/leds/leds-nic78bx.c
index a86b43dd995e..f3049fa14f04 100644
--- a/drivers/leds/leds-nic78bx.c
+++ b/drivers/leds/leds-nic78bx.c
@@ -118,6 +118,15 @@ static struct nic78bx_led nic78bx_leds[] = {
 	}
 };
 
+static void lock_led_reg_action(void *data)
+{
+	struct nic78bx_led_data *led_data = (struct nic78bx_led_data *)data;
+
+	/* Lock LED register */
+	outb(NIC78BX_LOCK_VALUE,
+	     led_data->io_base + NIC78BX_LOCK_REG_OFFSET);
+}
+
 static int nic78bx_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -152,6 +161,10 @@ static int nic78bx_probe(struct platform_device *pdev)
 	led_data->io_base = io_rc->start;
 	spin_lock_init(&led_data->lock);
 
+	ret = devm_add_action(dev, lock_led_reg_action, led_data);
+	if (ret)
+		return ret;
+
 	for (i = 0; i < ARRAY_SIZE(nic78bx_leds); i++) {
 		nic78bx_leds[i].data = led_data;
 
@@ -167,15 +180,6 @@ static int nic78bx_probe(struct platform_device *pdev)
 	return ret;
 }
 
-static void nic78bx_remove(struct platform_device *pdev)
-{
-	struct nic78bx_led_data *led_data = platform_get_drvdata(pdev);
-
-	/* Lock LED register */
-	outb(NIC78BX_LOCK_VALUE,
-	     led_data->io_base + NIC78BX_LOCK_REG_OFFSET);
-}
-
 static const struct acpi_device_id led_device_ids[] = {
 	{"NIC78B3", 0},
 	{"", 0},
@@ -184,7 +188,6 @@ MODULE_DEVICE_TABLE(acpi, led_device_ids);
 
 static struct platform_driver led_driver = {
 	.probe = nic78bx_probe,
-	.remove_new = nic78bx_remove,
 	.driver = {
 		.name = KBUILD_MODNAME,
 		.acpi_match_table = ACPI_PTR(led_device_ids),
-- 
2.25.1