leds: Change led_trigger_blink[_oneshot]() delay parameters to pass-by-value

led_blink_set[_oneshot]()'s delay_on and delay_off function parameters
are pass by reference, so that hw-blink implementations can report
back the actual achieved delays when the values have been rounded
to something the hw supports.

This is really only interesting for the sysfs API / the timer trigger.
Other triggers don't really care about this and none of the callers of
led_trigger_blink[_oneshot]() do anything with the returned delay values.

Change the led_trigger_blink[_oneshot]() delay parameters to pass-by-value,
there are 2 reasons for this:

1. led_cdev->blink_set() may sleep, while led_trigger_blink() may not.
So on hw where led_cdev->blink_set() sleeps the call needs to be deferred
to a workqueue, in which case the actual achieved delays are unknown
(this is a preparation patch for the deferring).

2. Since the callers don't care about the actual achieved delays, allowing
callers to directly pass a value leads to simpler code for most callers.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Tested-by: Yauhen Kharuzhy <jekhor@gmail.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: Florian Westphal <fw@strlen.de>
Link: https://lore.kernel.org/r/20230510162234.291439-2-hdegoede@redhat.comSigned-off-by: Lee Jones <lee@kernel.org>

drivers/leds/led-triggers.c

@@ -393,8 +393,8 @@ void led_trigger_event(struct led_trigger *trig,
 EXPORT_SYMBOL_GPL(led_trigger_event);
 
 static void led_trigger_blink_setup(struct led_trigger *trig,
-			     unsigned long *delay_on,
-			     unsigned long *delay_off,
+			     unsigned long delay_on,
+			     unsigned long delay_off,
 			     int oneshot,
 			     int invert)
 {
@@ -406,25 +406,25 @@ static void led_trigger_blink_setup(struct led_trigger *trig,
 	rcu_read_lock();
 	list_for_each_entry_rcu(led_cdev, &trig->led_cdevs, trig_list) {
 		if (oneshot)
-			led_blink_set_oneshot(led_cdev, delay_on, delay_off,
+			led_blink_set_oneshot(led_cdev, &delay_on, &delay_off,
 					      invert);
 		else
-			led_blink_set(led_cdev, delay_on, delay_off);
+			led_blink_set(led_cdev, &delay_on, &delay_off);
 	}
 	rcu_read_unlock();
 }
 
 void led_trigger_blink(struct led_trigger *trig,
-		       unsigned long *delay_on,
-		       unsigned long *delay_off)
+		       unsigned long delay_on,
+		       unsigned long delay_off)
 {
 	led_trigger_blink_setup(trig, delay_on, delay_off, 0, 0);
 }
 EXPORT_SYMBOL_GPL(led_trigger_blink);
 
 void led_trigger_blink_oneshot(struct led_trigger *trig,
-			       unsigned long *delay_on,
-			       unsigned long *delay_off,
+			       unsigned long delay_on,
+			       unsigned long delay_off,
 			       int invert)
 {
 	led_trigger_blink_setup(trig, delay_on, delay_off, 1, invert);

drivers/leds/trigger/ledtrig-disk.c

@@ -19,16 +19,13 @@ DEFINE_LED_TRIGGER(ledtrig_disk_write);
 
 void ledtrig_disk_activity(bool write)
 {
-	unsigned long blink_delay = BLINK_DELAY;
-
-	led_trigger_blink_oneshot(ledtrig_disk,
-				  &blink_delay, &blink_delay, 0);
+	led_trigger_blink_oneshot(ledtrig_disk, BLINK_DELAY, BLINK_DELAY, 0);
 	if (write)
 		led_trigger_blink_oneshot(ledtrig_disk_write,
-					  &blink_delay, &blink_delay, 0);
+					  BLINK_DELAY, BLINK_DELAY, 0);
 	else
 		led_trigger_blink_oneshot(ledtrig_disk_read,
-					  &blink_delay, &blink_delay, 0);
+					  BLINK_DELAY, BLINK_DELAY, 0);
 }
 EXPORT_SYMBOL(ledtrig_disk_activity);
 

drivers/leds/trigger/ledtrig-mtd.c

@@ -22,12 +22,8 @@ DEFINE_LED_TRIGGER(ledtrig_nand);
 
 void ledtrig_mtd_activity(void)
 {
-	unsigned long blink_delay = BLINK_DELAY;
-
-	led_trigger_blink_oneshot(ledtrig_mtd,
-				  &blink_delay, &blink_delay, 0);
-	led_trigger_blink_oneshot(ledtrig_nand,
-				  &blink_delay, &blink_delay, 0);
+	led_trigger_blink_oneshot(ledtrig_mtd, BLINK_DELAY, BLINK_DELAY, 0);
+	led_trigger_blink_oneshot(ledtrig_nand, BLINK_DELAY, BLINK_DELAY, 0);
 }
 EXPORT_SYMBOL(ledtrig_mtd_activity);
 

drivers/net/arcnet/arcnet.c

@@ -196,13 +196,10 @@ static void arcnet_dump_packet(struct net_device *dev, int bufnum,
 void arcnet_led_event(struct net_device *dev, enum arcnet_led_event event)
 {
 	struct arcnet_local *lp = netdev_priv(dev);
-	unsigned long led_delay = 350;
-	unsigned long tx_delay = 50;
 
 	switch (event) {
 	case ARCNET_LED_EVENT_RECON:
-		led_trigger_blink_oneshot(lp->recon_led_trig,
-					  &led_delay, &led_delay, 0);
+		led_trigger_blink_oneshot(lp->recon_led_trig, 350, 350, 0);
 		break;
 	case ARCNET_LED_EVENT_OPEN:
 		led_trigger_event(lp->tx_led_trig, LED_OFF);
@@ -213,8 +210,7 @@ void arcnet_led_event(struct net_device *dev, enum arcnet_led_event event)
 		led_trigger_event(lp->recon_led_trig, LED_OFF);
 		break;
 	case ARCNET_LED_EVENT_TX:
-		led_trigger_blink_oneshot(lp->tx_led_trig,
-					  &tx_delay, &tx_delay, 0);
+		led_trigger_blink_oneshot(lp->tx_led_trig, 50, 50, 0);
 		break;
 	}
 }

drivers/power/supply/power_supply_leds.c

@@ -22,8 +22,6 @@
 static void power_supply_update_bat_leds(struct power_supply *psy)
 {
 	union power_supply_propval status;
-	unsigned long delay_on = 0;
-	unsigned long delay_off = 0;
 
 	if (power_supply_get_property(psy, POWER_SUPPLY_PROP_STATUS, &status))
 		return;
@@ -42,8 +40,7 @@ static void power_supply_update_bat_leds(struct power_supply *psy)
 		led_trigger_event(psy->charging_full_trig, LED_FULL);
 		led_trigger_event(psy->charging_trig, LED_FULL);
 		led_trigger_event(psy->full_trig, LED_OFF);
-		led_trigger_blink(psy->charging_blink_full_solid_trig,
-			&delay_on, &delay_off);
+		led_trigger_blink(psy->charging_blink_full_solid_trig, 0, 0);
 		break;
 	default:
 		led_trigger_event(psy->charging_full_trig, LED_OFF);

drivers/usb/common/led.c

@@ -14,8 +14,6 @@
 
 #define BLINK_DELAY 30
 
-static unsigned long usb_blink_delay = BLINK_DELAY;
-
 DEFINE_LED_TRIGGER(ledtrig_usb_gadget);
 DEFINE_LED_TRIGGER(ledtrig_usb_host);
 
@@ -32,7 +30,7 @@ void usb_led_activity(enum usb_led_event ev)
 		break;
 	}
 	/* led_trigger_blink_oneshot() handles trig == NULL gracefully */
-	led_trigger_blink_oneshot(trig, &usb_blink_delay, &usb_blink_delay, 0);
+	led_trigger_blink_oneshot(trig, BLINK_DELAY, BLINK_DELAY, 0);
 }
 EXPORT_SYMBOL_GPL(usb_led_activity);
 

include/linux/leds.h

@@ -433,11 +433,11 @@ void led_trigger_register_simple(const char *name,
 				struct led_trigger **trigger);
 void led_trigger_unregister_simple(struct led_trigger *trigger);
 void led_trigger_event(struct led_trigger *trigger,  enum led_brightness event);
-void led_trigger_blink(struct led_trigger *trigger, unsigned long *delay_on,
-		       unsigned long *delay_off);
+void led_trigger_blink(struct led_trigger *trigger, unsigned long delay_on,
+		       unsigned long delay_off);
 void led_trigger_blink_oneshot(struct led_trigger *trigger,
-			       unsigned long *delay_on,
-			       unsigned long *delay_off,
+			       unsigned long delay_on,
+			       unsigned long delay_off,
 			       int invert);
 void led_trigger_set_default(struct led_classdev *led_cdev);
 int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trigger);
@@ -487,11 +487,11 @@ static inline void led_trigger_unregister_simple(struct led_trigger *trigger) {}
 static inline void led_trigger_event(struct led_trigger *trigger,
 				enum led_brightness event) {}
 static inline void led_trigger_blink(struct led_trigger *trigger,
-				      unsigned long *delay_on,
-				      unsigned long *delay_off) {}
+				      unsigned long delay_on,
+				      unsigned long delay_off) {}
 static inline void led_trigger_blink_oneshot(struct led_trigger *trigger,
-				      unsigned long *delay_on,
-				      unsigned long *delay_off,
+				      unsigned long delay_on,
+				      unsigned long delay_off,
 				      int invert) {}
 static inline void led_trigger_set_default(struct led_classdev *led_cdev) {}
 static inline int led_trigger_set(struct led_classdev *led_cdev,

net/mac80211/led.c

@@ -282,7 +282,7 @@ static void tpt_trig_timer(struct timer_list *t)
 		}
 	}
 
-	led_trigger_blink(&local->tpt_led, &on, &off);
+	led_trigger_blink(&local->tpt_led, on, off);
 }
 
 const char *

net/mac80211/led.h

@@ -13,22 +13,18 @@
 static inline void ieee80211_led_rx(struct ieee80211_local *local)
 {
 #ifdef CONFIG_MAC80211_LEDS
-	unsigned long led_delay = MAC80211_BLINK_DELAY;
-
 	if (!atomic_read(&local->rx_led_active))
 		return;
-	led_trigger_blink_oneshot(&local->rx_led, &led_delay, &led_delay, 0);
+	led_trigger_blink_oneshot(&local->rx_led, MAC80211_BLINK_DELAY, MAC80211_BLINK_DELAY, 0);
 #endif
 }
 
 static inline void ieee80211_led_tx(struct ieee80211_local *local)
 {
 #ifdef CONFIG_MAC80211_LEDS
-	unsigned long led_delay = MAC80211_BLINK_DELAY;
-
 	if (!atomic_read(&local->tx_led_active))
 		return;
-	led_trigger_blink_oneshot(&local->tx_led, &led_delay, &led_delay, 0);
+	led_trigger_blink_oneshot(&local->tx_led, MAC80211_BLINK_DELAY, MAC80211_BLINK_DELAY, 0);
 #endif
 }
 

net/netfilter/xt_LED.c

@@ -43,7 +43,6 @@ led_tg(struct sk_buff *skb, const struct xt_action_param *par)
 {
 	const struct xt_led_info *ledinfo = par->targinfo;
 	struct xt_led_info_internal *ledinternal = ledinfo->internal_data;
-	unsigned long led_delay = XT_LED_BLINK_DELAY;
 
 	/*
 	 * If "always blink" is enabled, and there's still some time until the
@@ -52,7 +51,7 @@ led_tg(struct sk_buff *skb, const struct xt_action_param *par)
 	if ((ledinfo->delay > 0) && ledinfo->always_blink &&
 	    timer_pending(&ledinternal->timer))
 		led_trigger_blink_oneshot(&ledinternal->netfilter_led_trigger,
-					  &led_delay, &led_delay, 1);
+					  XT_LED_BLINK_DELAY, XT_LED_BLINK_DELAY, 1);
 	else
 		led_trigger_event(&ledinternal->netfilter_led_trigger, LED_FULL);