linux-kernel - [PATCH v3 2/3] can: simplify LED trigger handling

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Date:   Tue,  8 May 2018 12:05:42 +0200
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>, Johan Hovold <johan@...nel.org>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>
Cc:     linux-serial@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-can@...r.kernel.org, kernel@...gutronix.de,
        One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
        Florian Fainelli <f.fainelli@...il.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        linux-kernel@...r.kernel.org, Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v3 2/3] can: simplify LED trigger handling

The new function led_trigger_register_format allows one to simplify LED
trigger handling considerably.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
---
 drivers/net/can/led.c   | 30 +++++++-----------------------
 include/linux/can/dev.h |  3 ---
 2 files changed, 7 insertions(+), 26 deletions(-)

diff --git a/drivers/net/can/led.c b/drivers/net/can/led.c
index 2d7d1b0d20f9..111f9769e9da 100644
--- a/drivers/net/can/led.c
+++ b/drivers/net/can/led.c
@@ -81,19 +81,9 @@ void devm_can_led_init(struct net_device *netdev)
 		return;
 	}
 
-	snprintf(priv->tx_led_trig_name, sizeof(priv->tx_led_trig_name),
-		 "%s-tx", netdev->name);
-	snprintf(priv->rx_led_trig_name, sizeof(priv->rx_led_trig_name),
-		 "%s-rx", netdev->name);
-	snprintf(priv->rxtx_led_trig_name, sizeof(priv->rxtx_led_trig_name),
-		 "%s-rxtx", netdev->name);
-
-	led_trigger_register_simple(priv->tx_led_trig_name,
-				    &priv->tx_led_trig);
-	led_trigger_register_simple(priv->rx_led_trig_name,
-				    &priv->rx_led_trig);
-	led_trigger_register_simple(priv->rxtx_led_trig_name,
-				    &priv->rxtx_led_trig);
+	led_trigger_register_format(&priv->tx_led_trig, "%s-tx", netdev->name);
+	led_trigger_register_format(&priv->rx_led_trig, "%s-rx", netdev->name);
+	led_trigger_register_format(&priv->rxtx_led_trig, "%s-rxtx", netdev->name);
 
 	devres_add(&netdev->dev, res);
 }
@@ -105,23 +95,17 @@ static int can_led_notifier(struct notifier_block *nb, unsigned long msg,
 {
 	struct net_device *netdev = netdev_notifier_info_to_dev(ptr);
 	struct can_priv *priv = safe_candev_priv(netdev);
-	char name[CAN_LED_NAME_SZ];
 
 	if (!priv)
 		return NOTIFY_DONE;
 
-	if (!priv->tx_led_trig || !priv->rx_led_trig || !priv->rxtx_led_trig)
-		return NOTIFY_DONE;
-
 	if (msg == NETDEV_CHANGENAME) {
-		snprintf(name, sizeof(name), "%s-tx", netdev->name);
-		led_trigger_rename(priv->tx_led_trig, name);
+		led_trigger_rename(priv->tx_led_trig, "%s-tx", netdev->name);
 
-		snprintf(name, sizeof(name), "%s-rx", netdev->name);
-		led_trigger_rename(priv->rx_led_trig, name);
+		led_trigger_rename(priv->rx_led_trig, "%s-rx", netdev->name);
 
-		snprintf(name, sizeof(name), "%s-rxtx", netdev->name);
-		led_trigger_rename(priv->rxtx_led_trig, name);
+		led_trigger_rename(priv->rxtx_led_trig,
+				   "%s-rxtx", netdev->name);
 	}
 
 	return NOTIFY_DONE;
diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 055aaf5ed9af..ff358269aa9c 100644
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -73,11 +73,8 @@ struct can_priv {
 
 #ifdef CONFIG_CAN_LEDS
 	struct led_trigger *tx_led_trig;
-	char tx_led_trig_name[CAN_LED_NAME_SZ];
 	struct led_trigger *rx_led_trig;
-	char rx_led_trig_name[CAN_LED_NAME_SZ];
 	struct led_trigger *rxtx_led_trig;
-	char rxtx_led_trig_name[CAN_LED_NAME_SZ];
 #endif
 };
 
-- 
2.17.0