linux-kernel - [RFC PATCH v3 09/18] ledtrig-blkdev: Add function to disassociate a device from all LEDs

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Date:   Wed, 18 Aug 2021 21:50:44 -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 09/18] ledtrig-blkdev: Add function to disassociate a device from all LEDs

Called when block device is being removed

Signed-off-by: Ian Pilcher <arequipeno@...il.com>
---
 drivers/leds/trigger/ledtrig-blkdev.c | 31 +++++++++++++++++++++++++++
 include/linux/leds.h                  |  4 ++++
 2 files changed, 35 insertions(+)

diff --git a/drivers/leds/trigger/ledtrig-blkdev.c b/drivers/leds/trigger/ledtrig-blkdev.c
index 447fc81ae0c5..2072cc904616 100644
--- a/drivers/leds/trigger/ledtrig-blkdev.c
+++ b/drivers/leds/trigger/ledtrig-blkdev.c
@@ -281,3 +281,34 @@ static void blkdev_disk_delete(struct ledtrig_blkdev_led *const led,
 exit_unlock:
 	mutex_unlock(&ledtrig_blkdev_mutex);
 }
+
+
+/*
+ *
+ *	Disassociate all LEDs from a block device (because it's going away)
+ *
+ */
+
+/**
+ * ledtrig_blkdev_disk_cleanup - remove a block device from the blkdev LED
+ * trigger
+ * @disk:	the disk to be removed
+ */
+void ledtrig_blkdev_disk_cleanup(struct gendisk *const gd)
+{
+	struct ledtrig_blkdev_link *link;
+	struct hlist_node *next;
+
+	mutex_lock(&ledtrig_blkdev_mutex);
+
+	if (gd->ledtrig != NULL) {
+
+		hlist_for_each_entry_safe(link, next,
+					  &gd->ledtrig->leds, disk_leds_node) {
+			blkdev_disk_del_locked(link->led, link, gd->ledtrig);
+		}
+	}
+
+	mutex_unlock(&ledtrig_blkdev_mutex);
+}
+EXPORT_SYMBOL_GPL(ledtrig_blkdev_disk_cleanup);
diff --git a/include/linux/leds.h b/include/linux/leds.h
index 6b67650d8797..98c479814988 100644
--- a/include/linux/leds.h
+++ b/include/linux/leds.h
@@ -609,10 +609,14 @@ static inline void ledtrig_blkdev_disk_init(struct gendisk *const gd)
 {
 	gd->ledtrig = NULL;
 }
+void ledtrig_blkdev_disk_cleanup(struct gendisk *const gd);
 #else	/* CONFIG_LEDS_TRIGGER_BLKDEV */
 static inline void ledtrig_blkdev_disk_init(const struct gendisk *gd)
 {
 }
+static inline void ledtrig_blkdev_disk_cleanup(const struct gendisk *gd)
+{
+}
 #endif	/* CONFIG_LEDS_TRIGGER_BLKDEV */
 
 #endif		/* __LINUX_LEDS_H_INCLUDED */
-- 
2.31.1