[PATCH 2/4] leds: netdev trigger: factor out middle part of device_name_store

[Rasmus Villemoes <linux@rasmusvillemoes.dk>]

Take the part of device_name_store that puts the old device (if any),
copies the new device name, looks the name up etc. into a separate
helper function. This is preparation for using that helper from a
function that will initialize the led_netdev_data from a device tree
node. No functional change.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
---
 drivers/leds/trigger/ledtrig-netdev.c | 30 ++++++++++++++++-----------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index ddc2b90ad7ec..55153a7e8433 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -104,19 +104,9 @@ static ssize_t device_name_show(struct device *dev,
 	return len;
 }
 
-static ssize_t device_name_store(struct device *dev,
-				 struct device_attribute *attr, const char *buf,
-				 size_t size)
+static void set_device(struct led_netdev_data *trigger_data,
+		       const char *buf, size_t size)
 {
-	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
-
-	if (size >= IFNAMSIZ)
-		return -EINVAL;
-
-	cancel_delayed_work_sync(&trigger_data->work);
-
-	spin_lock_bh(&trigger_data->lock);
-
 	if (trigger_data->net_dev) {
 		dev_put(trigger_data->net_dev);
 		trigger_data->net_dev = NULL;
@@ -137,6 +127,22 @@ static ssize_t device_name_store(struct device *dev,
 			set_bit(NETDEV_LED_MODE_LINKUP, &trigger_data->mode);
 
 	trigger_data->last_activity = 0;
+}
+
+static ssize_t device_name_store(struct device *dev,
+				 struct device_attribute *attr, const char *buf,
+				 size_t size)
+{
+	struct led_netdev_data *trigger_data = led_trigger_get_drvdata(dev);
+
+	if (size >= IFNAMSIZ)
+		return -EINVAL;
+
+	cancel_delayed_work_sync(&trigger_data->work);
+
+	spin_lock_bh(&trigger_data->lock);
+
+	set_device(trigger_data, buf, size);
 
 	set_baseline_state(trigger_data);
 	spin_unlock_bh(&trigger_data->lock);
-- 
2.20.1