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.com
Signed-off-by: Lee Jones <lee@kernel.org>

6 files changed, 17 insertions, 33 deletions

diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 072491d3e17b..e06361165e9b 100644
--- a/drivers/leds/led-triggers.c
+++ b/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);
diff --git a/drivers/leds/trigger/ledtrig-disk.c b/drivers/leds/trigger/ledtrig-disk.c
index 0b7dfbd04273..e9b87ee944f2 100644
--- a/drivers/leds/trigger/ledtrig-disk.c
+++ b/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);
 
diff --git a/drivers/leds/trigger/ledtrig-mtd.c b/drivers/leds/trigger/ledtrig-mtd.c
index 8fa763c2269b..bbe6876a249d 100644
--- a/drivers/leds/trigger/ledtrig-mtd.c
+++ b/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);
 
diff --git a/drivers/net/arcnet/arcnet.c b/drivers/net/arcnet/arcnet.c
index 1bad1866ae46..99265667538c 100644
--- a/drivers/net/arcnet/arcnet.c
+++ b/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;
 	}
 }
diff --git a/drivers/power/supply/power_supply_leds.c b/drivers/power/supply/power_supply_leds.c
index 702bf83f6e6d..e2f554e4e4e6 100644
--- a/drivers/power/supply/power_supply_leds.c
+++ b/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);
diff --git a/drivers/usb/common/led.c b/drivers/usb/common/led.c
index 0865dd44a80a..1de18d90b134 100644
--- a/drivers/usb/common/led.c
+++ b/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);