Thread (37 messages) 37 messages, 4 authors, 2022-07-19
STALE1438d

[PATCH 01/10] md: fix mddev->kobj lifetime

From: Christoph Hellwig <hch@lst.de>
Date: 2022-07-18 06:34:22
Also in: linux-block
Subsystem: software raid (multiple disks) support, the rest · Maintainers: Song Liu, Yu Kuai, Linus Torvalds

Once a kobject is initialized, the containing object should not be
directly freed.  So delay initialization until it is added.  Also
remove the kobject_del call as the last put will remove the kobject as
well.  The explicitly delete isn't needed here, and dropping it will
simplify further fixes.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/md/md.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index b64de313838f2..a49ddc9454ff6 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -678,7 +678,6 @@ static void md_safemode_timeout(struct timer_list *t);
 
 void mddev_init(struct mddev *mddev)
 {
-	kobject_init(&mddev->kobj, &md_ktype);
 	mutex_init(&mddev->open_mutex);
 	mutex_init(&mddev->reconfig_mutex);
 	mutex_init(&mddev->bitmap_info.mutex);
@@ -5617,7 +5616,6 @@ static void mddev_delayed_delete(struct work_struct *ws)
 {
 	struct mddev *mddev = container_of(ws, struct mddev, del_work);
 
-	kobject_del(&mddev->kobj);
 	kobject_put(&mddev->kobj);
 }
 
@@ -5719,6 +5717,7 @@ int md_alloc(dev_t dev, char *name)
 	if (error)
 		goto out_cleanup_disk;
 
+	kobject_init(&mddev->kobj, &md_ktype);
 	error = kobject_add(&mddev->kobj, &disk_to_dev(disk)->kobj, "%s", "md");
 	if (error)
 		goto out_del_gendisk;
-- 
2.30.2
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