[PATCH v7 02/16] leds: triggers: let struct led_trigger::activate() return an error code

From: Uwe Kleine-KÃnig
Date: Mon Jul 02 2018 - 16:06:17 EST

Given that activating a trigger can fail, let the callback return an
indication. This prevents to have a trigger active according to the
"trigger" sysfs attribute but not functional.

All users are changed accordingly to return 0 for now. There is no intended
change in behaviour.

Acked-by: Pavel Machek <pavel@xxxxxx>
Signed-off-by: Uwe Kleine-KÃnig <u.kleine-koenig@xxxxxxxxxxxxxx>
---
drivers/leds/led-triggers.c | 24 ++++++++++++++++++++---
drivers/leds/trigger/ledtrig-activity.c | 8 +++++---
drivers/leds/trigger/ledtrig-backlight.c | 8 +++++---
drivers/leds/trigger/ledtrig-default-on.c | 3 ++-
drivers/leds/trigger/ledtrig-gpio.c | 8 +++++---
drivers/leds/trigger/ledtrig-heartbeat.c | 8 +++++---
drivers/leds/trigger/ledtrig-netdev.c | 8 +++++---
drivers/leds/trigger/ledtrig-oneshot.c | 8 +++++---
drivers/leds/trigger/ledtrig-timer.c | 8 +++++---
drivers/leds/trigger/ledtrig-transient.c | 8 +++++---
drivers/tty/vt/keyboard.c | 4 +++-
drivers/usb/core/ledtrig-usbport.c | 7 ++++---
include/linux/leds.h | 14 ++++++++-----
net/bluetooth/leds.c | 6 ++++--
net/mac80211/led.c | 20 ++++++++++++++-----
net/rfkill/core.c | 4 +++-
16 files changed, 101 insertions(+), 45 deletions(-)

diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 431123b048a2..a8786f4b3453 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -103,15 +103,16 @@ ssize_t led_trigger_show(struct device *dev, struct device_attribute *attr,
EXPORT_SYMBOL_GPL(led_trigger_show);

/* Caller must ensure led_cdev->trigger_lock held */
-void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
+int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
{
unsigned long flags;
char *event = NULL;
char *envp[2];
const char *name;
+ int ret;

if (!led_cdev->trigger && !trig)
- return;
+ return 0;

name = trig ? trig->name : "none";
event = kasprintf(GFP_KERNEL, "TRIGGER=%s", name);
@@ -134,8 +135,14 @@ void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
list_add_tail(&led_cdev->trig_list, &trig->led_cdevs);
write_unlock_irqrestore(&trig->leddev_list_lock, flags);
led_cdev->trigger = trig;
+
if (trig->activate)
- trig->activate(led_cdev);
+ ret = trig->activate(led_cdev);
+ else
+ ret = 0;
+
+ if (ret)
+ goto err_activate;
}

if (event) {
@@ -146,6 +153,17 @@ void led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
"%s: Error sending uevent\n", __func__);
kfree(event);
}
+
+ return 0;
+
+err_activate:
+ led_cdev->trigger = NULL;
+ write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags);
+ list_del(&led_cdev->trig_list);
+ write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, flags);
+ led_set_brightness(led_cdev, LED_OFF);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(led_trigger_set);

diff --git a/drivers/leds/trigger/ledtrig-activity.c b/drivers/leds/trigger/ledtrig-activity.c
index b39e1bb9a9ec..2fc065fb1754 100644
--- a/drivers/leds/trigger/ledtrig-activity.c
+++ b/drivers/leds/trigger/ledtrig-activity.c
@@ -178,20 +178,20 @@ static ssize_t led_invert_store(struct device *dev,

static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);

-static void activity_activate(struct led_classdev *led_cdev)
+static int activity_activate(struct led_classdev *led_cdev)
{
struct activity_data *activity_data;
int rc;

activity_data = kzalloc(sizeof(*activity_data), GFP_KERNEL);
if (!activity_data)
- return;
+ return 0;

led_cdev->trigger_data = activity_data;
rc = device_create_file(led_cdev->dev, &dev_attr_invert);
if (rc) {
kfree(led_cdev->trigger_data);
- return;
+ return 0;
}

activity_data->led_cdev = led_cdev;
@@ -201,6 +201,8 @@ static void activity_activate(struct led_classdev *led_cdev)
led_activity_function(&activity_data->timer);
set_bit(LED_BLINK_SW, &led_cdev->work_flags);
led_cdev->activated = true;
+
+ return 0;
}

static void activity_deactivate(struct led_classdev *led_cdev)
diff --git a/drivers/leds/trigger/ledtrig-backlight.c b/drivers/leds/trigger/ledtrig-backlight.c
index 1ca1f1608f76..84512960d630 100644
--- a/drivers/leds/trigger/ledtrig-backlight.c
+++ b/drivers/leds/trigger/ledtrig-backlight.c
@@ -97,7 +97,7 @@ static ssize_t bl_trig_invert_store(struct device *dev,
}
static DEVICE_ATTR(inverted, 0644, bl_trig_invert_show, bl_trig_invert_store);

-static void bl_trig_activate(struct led_classdev *led)
+static int bl_trig_activate(struct led_classdev *led)
{
int ret;

@@ -107,7 +107,7 @@ static void bl_trig_activate(struct led_classdev *led)
led->trigger_data = n;
if (!n) {
dev_err(led->dev, "unable to allocate backlight trigger\n");
- return;
+ return 0;
}

ret = device_create_file(led->dev, &dev_attr_inverted);
@@ -124,11 +124,13 @@ static void bl_trig_activate(struct led_classdev *led)
dev_err(led->dev, "unable to register backlight trigger\n");
led->activated = true;

- return;
+ return 0;

err_invert:
led->trigger_data = NULL;
kfree(n);
+
+ return 0;
}

static void bl_trig_deactivate(struct led_classdev *led)
diff --git a/drivers/leds/trigger/ledtrig-default-on.c b/drivers/leds/trigger/ledtrig-default-on.c
index 4ccea04b7a6b..2996fe672198 100644
--- a/drivers/leds/trigger/ledtrig-default-on.c
+++ b/drivers/leds/trigger/ledtrig-default-on.c
@@ -16,9 +16,10 @@
#include <linux/leds.h>
#include "../leds.h"

-static void defon_trig_activate(struct led_classdev *led_cdev)
+static int defon_trig_activate(struct led_classdev *led_cdev)
{
led_set_brightness_nosleep(led_cdev, led_cdev->max_brightness);
+ return 0;
}

static struct led_trigger defon_led_trigger = {
diff --git a/drivers/leds/trigger/ledtrig-gpio.c b/drivers/leds/trigger/ledtrig-gpio.c
index 93906a17a4b6..f5358c40d03f 100644
--- a/drivers/leds/trigger/ledtrig-gpio.c
+++ b/drivers/leds/trigger/ledtrig-gpio.c
@@ -162,14 +162,14 @@ static ssize_t gpio_trig_gpio_store(struct device *dev,
}
static DEVICE_ATTR(gpio, 0644, gpio_trig_gpio_show, gpio_trig_gpio_store);

-static void gpio_trig_activate(struct led_classdev *led)
+static int gpio_trig_activate(struct led_classdev *led)
{
struct gpio_trig_data *gpio_data;
int ret;

gpio_data = kzalloc(sizeof(*gpio_data), GFP_KERNEL);
if (!gpio_data)
- return;
+ return 0;

ret = device_create_file(led->dev, &dev_attr_gpio);
if (ret)
@@ -187,7 +187,7 @@ static void gpio_trig_activate(struct led_classdev *led)
led->trigger_data = gpio_data;
led->activated = true;

- return;
+ return 0;

err_brightness:
device_remove_file(led->dev, &dev_attr_inverted);
@@ -197,6 +197,8 @@ static void gpio_trig_activate(struct led_classdev *led)

err_gpio:
kfree(gpio_data);
+
+ return 0;
}

static void gpio_trig_deactivate(struct led_classdev *led)
diff --git a/drivers/leds/trigger/ledtrig-heartbeat.c b/drivers/leds/trigger/ledtrig-heartbeat.c
index 304b929edb8e..03a8dfce8fb9 100644
--- a/drivers/leds/trigger/ledtrig-heartbeat.c
+++ b/drivers/leds/trigger/ledtrig-heartbeat.c
@@ -121,21 +121,21 @@ static ssize_t led_invert_store(struct device *dev,

static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);

-static void heartbeat_trig_activate(struct led_classdev *led_cdev)
+static int heartbeat_trig_activate(struct led_classdev *led_cdev)
{
struct heartbeat_trig_data *heartbeat_data;
int rc;

heartbeat_data = kzalloc(sizeof(*heartbeat_data), GFP_KERNEL);
if (!heartbeat_data)
- return;
+ return 0;

led_cdev->trigger_data = heartbeat_data;
heartbeat_data->led_cdev = led_cdev;
rc = device_create_file(led_cdev->dev, &dev_attr_invert);
if (rc) {
kfree(led_cdev->trigger_data);
- return;
+ return 0;
}

timer_setup(&heartbeat_data->timer, led_heartbeat_function, 0);
@@ -145,6 +145,8 @@ static void heartbeat_trig_activate(struct led_classdev *led_cdev)
led_heartbeat_function(&heartbeat_data->timer);
set_bit(LED_BLINK_SW, &led_cdev->work_flags);
led_cdev->activated = true;
+
+ return 0;
}

static void heartbeat_trig_deactivate(struct led_classdev *led_cdev)
diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index 6df4781a6308..bb05937255de 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -388,14 +388,14 @@ static void netdev_trig_work(struct work_struct *work)
(atomic_read(&trigger_data->interval)*2));
}

-static void netdev_trig_activate(struct led_classdev *led_cdev)
+static int netdev_trig_activate(struct led_classdev *led_cdev)
{
struct led_netdev_data *trigger_data;
int rc;

trigger_data = kzalloc(sizeof(struct led_netdev_data), GFP_KERNEL);
if (!trigger_data)
- return;
+ return 0;

spin_lock_init(&trigger_data->lock);

@@ -432,7 +432,7 @@ static void netdev_trig_activate(struct led_classdev *led_cdev)
rc = register_netdevice_notifier(&trigger_data->notifier);
if (rc)
goto err_out_interval;
- return;
+ return 0;

err_out_interval:
device_remove_file(led_cdev->dev, &dev_attr_interval);
@@ -447,6 +447,8 @@ static void netdev_trig_activate(struct led_classdev *led_cdev)
err_out:
led_cdev->trigger_data = NULL;
kfree(trigger_data);
+
+ return 0;
}

static void netdev_trig_deactivate(struct led_classdev *led_cdev)
diff --git a/drivers/leds/trigger/ledtrig-oneshot.c b/drivers/leds/trigger/ledtrig-oneshot.c
index b8ea9f0f1e19..7bbf92bd7f80 100644
--- a/drivers/leds/trigger/ledtrig-oneshot.c
+++ b/drivers/leds/trigger/ledtrig-oneshot.c
@@ -122,14 +122,14 @@ static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);
static DEVICE_ATTR(invert, 0644, led_invert_show, led_invert_store);
static DEVICE_ATTR(shot, 0200, NULL, led_shot);

-static void oneshot_trig_activate(struct led_classdev *led_cdev)
+static int oneshot_trig_activate(struct led_classdev *led_cdev)
{
struct oneshot_trig_data *oneshot_data;
int rc;

oneshot_data = kzalloc(sizeof(*oneshot_data), GFP_KERNEL);
if (!oneshot_data)
- return;
+ return 0;

led_cdev->trigger_data = oneshot_data;

@@ -151,7 +151,7 @@ static void oneshot_trig_activate(struct led_classdev *led_cdev)

led_cdev->activated = true;

- return;
+ return 0;

err_out_invert:
device_remove_file(led_cdev->dev, &dev_attr_invert);
@@ -161,6 +161,8 @@ static void oneshot_trig_activate(struct led_classdev *led_cdev)
device_remove_file(led_cdev->dev, &dev_attr_delay_on);
err_out_trig_data:
kfree(led_cdev->trigger_data);
+
+ return 0;
}

static void oneshot_trig_deactivate(struct led_classdev *led_cdev)
diff --git a/drivers/leds/trigger/ledtrig-timer.c b/drivers/leds/trigger/ledtrig-timer.c
index 10fc0966b0e3..527055d815ad 100644
--- a/drivers/leds/trigger/ledtrig-timer.c
+++ b/drivers/leds/trigger/ledtrig-timer.c
@@ -70,7 +70,7 @@ static ssize_t led_delay_off_store(struct device *dev,
static DEVICE_ATTR(delay_on, 0644, led_delay_on_show, led_delay_on_store);
static DEVICE_ATTR(delay_off, 0644, led_delay_off_show, led_delay_off_store);

-static void timer_trig_activate(struct led_classdev *led_cdev)
+static int timer_trig_activate(struct led_classdev *led_cdev)
{
int rc;

@@ -78,7 +78,7 @@ static void timer_trig_activate(struct led_classdev *led_cdev)

rc = device_create_file(led_cdev->dev, &dev_attr_delay_on);
if (rc)
- return;
+ return 0;
rc = device_create_file(led_cdev->dev, &dev_attr_delay_off);
if (rc)
goto err_out_delayon;
@@ -87,10 +87,12 @@ static void timer_trig_activate(struct led_classdev *led_cdev)
&led_cdev->blink_delay_off);
led_cdev->activated = true;

- return;
+ return 0;

err_out_delayon:
device_remove_file(led_cdev->dev, &dev_attr_delay_on);
+
+ return 0;
}

static void timer_trig_deactivate(struct led_classdev *led_cdev)
diff --git a/drivers/leds/trigger/ledtrig-transient.c b/drivers/leds/trigger/ledtrig-transient.c
index 9d1769073562..a55fc58179a9 100644
--- a/drivers/leds/trigger/ledtrig-transient.c
+++ b/drivers/leds/trigger/ledtrig-transient.c
@@ -152,7 +152,7 @@ static DEVICE_ATTR(duration, 0644, transient_duration_show,
transient_duration_store);
static DEVICE_ATTR(state, 0644, transient_state_show, transient_state_store);

-static void transient_trig_activate(struct led_classdev *led_cdev)
+static int transient_trig_activate(struct led_classdev *led_cdev)
{
int rc;
struct transient_trig_data *tdata;
@@ -161,7 +161,7 @@ static void transient_trig_activate(struct led_classdev *led_cdev)
if (!tdata) {
dev_err(led_cdev->dev,
"unable to allocate transient trigger\n");
- return;
+ return 0;
}
led_cdev->trigger_data = tdata;
tdata->led_cdev = led_cdev;
@@ -181,7 +181,7 @@ static void transient_trig_activate(struct led_classdev *led_cdev)
timer_setup(&tdata->timer, transient_timer_function, 0);
led_cdev->activated = true;

- return;
+ return 0;

err_out_state:
device_remove_file(led_cdev->dev, &dev_attr_duration);
@@ -191,6 +191,8 @@ static void transient_trig_activate(struct led_classdev *led_cdev)
dev_err(led_cdev->dev, "unable to register transient trigger\n");
led_cdev->trigger_data = NULL;
kfree(tdata);
+
+ return 0;
}

static void transient_trig_deactivate(struct led_classdev *led_cdev)
diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c
index d5b4a2b44ab8..de310621b8e7 100644
--- a/drivers/tty/vt/keyboard.c
+++ b/drivers/tty/vt/keyboard.c
@@ -959,7 +959,7 @@ struct kbd_led_trigger {
unsigned int mask;
};

-static void kbd_led_trigger_activate(struct led_classdev *cdev)
+static int kbd_led_trigger_activate(struct led_classdev *cdev)
{
struct kbd_led_trigger *trigger =
container_of(cdev->trigger, struct kbd_led_trigger, trigger);
@@ -970,6 +970,8 @@ static void kbd_led_trigger_activate(struct led_classdev *cdev)
ledstate & trigger->mask ?
LED_FULL : LED_OFF);
tasklet_enable(&keyboard_tasklet);
+
+ return 0;
}

#define KBD_LED_TRIGGER(_led_bit, _name) { \
diff --git a/drivers/usb/core/ledtrig-usbport.c b/drivers/usb/core/ledtrig-usbport.c
index d775ffea20c3..aa1d51458da7 100644
--- a/drivers/usb/core/ledtrig-usbport.c
+++ b/drivers/usb/core/ledtrig-usbport.c
@@ -298,14 +298,14 @@ static int usbport_trig_notify(struct notifier_block *nb, unsigned long action,
return NOTIFY_DONE;
}

-static void usbport_trig_activate(struct led_classdev *led_cdev)
+static int usbport_trig_activate(struct led_classdev *led_cdev)
{
struct usbport_trig_data *usbport_data;
int err;

usbport_data = kzalloc(sizeof(*usbport_data), GFP_KERNEL);
if (!usbport_data)
- return;
+ return 0;
usbport_data->led_cdev = led_cdev;

/* List of ports */
@@ -322,10 +322,11 @@ static void usbport_trig_activate(struct led_classdev *led_cdev)
usb_register_notify(&usbport_data->nb);

led_cdev->activated = true;
- return;
+ return 0;

err_free:
kfree(usbport_data);
+ return 0;
}

static void usbport_trig_deactivate(struct led_classdev *led_cdev)
diff --git a/include/linux/leds.h b/include/linux/leds.h
index b7e82550e655..ba5baaaa43bf 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -253,7 +253,7 @@ static inline bool led_sysfs_is_disabled(struct led_classdev *led_cdev)
struct led_trigger {
/* Trigger Properties */
const char *name;
- void (*activate)(struct led_classdev *led_cdev);
+ int (*activate)(struct led_classdev *led_cdev);
void (*deactivate)(struct led_classdev *led_cdev);

/* LEDs under control by this trigger (for simple triggers) */
@@ -288,8 +288,8 @@ extern void led_trigger_blink_oneshot(struct led_trigger *trigger,
unsigned long *delay_off,
int invert);
extern void led_trigger_set_default(struct led_classdev *led_cdev);
-extern void led_trigger_set(struct led_classdev *led_cdev,
- struct led_trigger *trigger);
+extern int led_trigger_set(struct led_classdev *led_cdev,
+ struct led_trigger *trigger);
extern void led_trigger_remove(struct led_classdev *led_cdev);

static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
@@ -334,8 +334,12 @@ static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
unsigned long *delay_off,
int invert) {}
static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
-static inline void led_trigger_set(struct led_classdev *led_cdev,
- struct led_trigger *trigger) {}
+static inline int led_trigger_set(struct led_classdev *led_cdev,
+ struct led_trigger *trigger)
+{
+ return 0;
+}
+
static inline void led_trigger_remove(struct led_classdev *led_cdev) {}
static inline void *led_get_trigger_data(struct led_classdev *led_cdev)
{
diff --git a/net/bluetooth/leds.c b/net/bluetooth/leds.c
index cb670b5594eb..6d59a5023231 100644
--- a/net/bluetooth/leds.c
+++ b/net/bluetooth/leds.c
@@ -43,7 +43,7 @@ void hci_leds_update_powered(struct hci_dev *hdev, bool enabled)
led_trigger_event(bt_power_led_trigger, enabled ? LED_FULL : LED_OFF);
}

-static void power_activate(struct led_classdev *led_cdev)
+static int power_activate(struct led_classdev *led_cdev)
{
struct hci_basic_led_trigger *htrig;
bool powered;
@@ -52,10 +52,12 @@ static void power_activate(struct led_classdev *led_cdev)
powered = test_bit(HCI_UP, &htrig->hdev->flags);

led_trigger_event(led_cdev->trigger, powered ? LED_FULL : LED_OFF);
+
+ return 0;
}

static struct led_trigger *led_allocate_basic(struct hci_dev *hdev,
- void (*activate)(struct led_classdev *led_cdev),
+ int (*activate)(struct led_classdev *led_cdev),
const char *name)
{
struct hci_basic_led_trigger *htrig;
diff --git a/net/mac80211/led.c b/net/mac80211/led.c
index ba0b507ea691..469a531e8d24 100644
--- a/net/mac80211/led.c
+++ b/net/mac80211/led.c
@@ -52,13 +52,15 @@ void ieee80211_free_led_names(struct ieee80211_local *local)
kfree(local->radio_led.name);
}

-static void ieee80211_tx_led_activate(struct led_classdev *led_cdev)
+static int ieee80211_tx_led_activate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
tx_led);

atomic_inc(&local->tx_led_active);
+
+ return 0
}

static void ieee80211_tx_led_deactivate(struct led_classdev *led_cdev)
@@ -70,13 +72,15 @@ static void ieee80211_tx_led_deactivate(struct led_classdev *led_cdev)
atomic_dec(&local->tx_led_active);
}

-static void ieee80211_rx_led_activate(struct led_classdev *led_cdev)
+static int ieee80211_rx_led_activate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
rx_led);

atomic_inc(&local->rx_led_active);
+
+ return 0;
}

static void ieee80211_rx_led_deactivate(struct led_classdev *led_cdev)
@@ -88,13 +92,15 @@ static void ieee80211_rx_led_deactivate(struct led_classdev *led_cdev)
atomic_dec(&local->rx_led_active);
}

-static void ieee80211_assoc_led_activate(struct led_classdev *led_cdev)
+static int ieee80211_assoc_led_activate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
assoc_led);

atomic_inc(&local->assoc_led_active);
+
+ return 0;
}

static void ieee80211_assoc_led_deactivate(struct led_classdev *led_cdev)
@@ -106,13 +112,15 @@ static void ieee80211_assoc_led_deactivate(struct led_classdev *led_cdev)
atomic_dec(&local->assoc_led_active);
}

-static void ieee80211_radio_led_activate(struct led_classdev *led_cdev)
+static int ieee80211_radio_led_activate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
radio_led);

atomic_inc(&local->radio_led_active);
+
+ return 0;
}

static void ieee80211_radio_led_deactivate(struct led_classdev *led_cdev)
@@ -124,13 +132,15 @@ static void ieee80211_radio_led_deactivate(struct led_classdev *led_cdev)
atomic_dec(&local->radio_led_active);
}

-static void ieee80211_tpt_led_activate(struct led_classdev *led_cdev)
+static int ieee80211_tpt_led_activate(struct led_classdev *led_cdev)
{
struct ieee80211_local *local = container_of(led_cdev->trigger,
struct ieee80211_local,
tpt_led);

atomic_inc(&local->tpt_led_active);
+
+ return 0;
}

static void ieee80211_tpt_led_deactivate(struct led_classdev *led_cdev)
diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index a7a4e6ff9be2..1355f5ca8d22 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -141,13 +141,15 @@ static void rfkill_led_trigger_event(struct rfkill *rfkill)
led_trigger_event(trigger, LED_FULL);
}

-static void rfkill_led_trigger_activate(struct led_classdev *led)
+static int rfkill_led_trigger_activate(struct led_classdev *led)
{
struct rfkill *rfkill;

rfkill = container_of(led->trigger, struct rfkill, led_trigger);

rfkill_led_trigger_event(rfkill);
+
+ return 0;
}

const char *rfkill_get_led_trigger_name(struct rfkill *rfkill)
--
2.18.0