linux-kernel - [RFC PATCH v3 16/18] ledtrig-blkdev: Add function to disassociate an LED from the trigger

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Date:   Wed, 18 Aug 2021 21:50:51 -0500
From:   Ian Pilcher <arequipeno@...il.com>
To:     linux-block@...r.kernel.org, linux-leds@...r.kernel.org
Cc:     axboe@...nel.dk, pavel@....cz, kabel@...nel.org,
        linux-kernel@...r.kernel.org, kernelnewbies@...nelnewbies.org
Subject: [RFC PATCH v3 16/18] ledtrig-blkdev: Add function to disassociate an LED from the trigger

Remove all device associations with this LED

Remove /sys/class/leds/<led>/block_devices directory

Free per-LED data structure

Signed-off-by: Ian Pilcher <arequipeno@...il.com>
---
 drivers/leds/trigger/ledtrig-blkdev.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/leds/trigger/ledtrig-blkdev.c b/drivers/leds/trigger/ledtrig-blkdev.c
index b331e3f24b04..01573c1ad855 100644
--- a/drivers/leds/trigger/ledtrig-blkdev.c
+++ b/drivers/leds/trigger/ledtrig-blkdev.c
@@ -704,3 +704,28 @@ static int blkdev_activate(struct led_classdev *const led_dev)
 exit_return:
 	return ret;
 }
+
+
+/*
+ *
+ *	Disassociate an LED from the trigger
+ *
+ */
+
+static void blkdev_deactivate(struct led_classdev *const led_dev)
+{
+	struct ledtrig_blkdev_led *const led = led_get_trigger_data(led_dev);
+	struct ledtrig_blkdev_link *link;
+	struct hlist_node *next;
+
+	mutex_lock(&ledtrig_blkdev_mutex);
+
+	hlist_for_each_entry_safe(link, next, &led->disks, led_disks_node)
+		blkdev_disk_del_locked(led, link, link->disk);
+
+	hlist_del(&led->leds_node);
+	kobject_put(led->dir);
+	kfree(led);
+
+	mutex_unlock(&ledtrig_blkdev_mutex);
+}
-- 
2.31.1