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leds: triggers: let struct led_trigger::activate() return an error code

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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.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
This commit is contained in:
Uwe Kleine-König
2018-07-02 22:05:21 +02:00
committed by Jacek Anaszewski
parent 033692eb3e
commit 2282e125a4
16 changed files with 101 additions and 45 deletions
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6
net/bluetooth/leds.c
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@@ -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;