[PATCH] kernfs: Avoid re-adding kernfs_node into kernfs_notify_list.

[Imran Khan]

---
 fs/kernfs/file.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index bb933221b4bae..e8ec054e11c63 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -917,6 +917,7 @@ static void kernfs_notify_workfn(struct work_struct *work)
        if (free == NULL)
                return;

+       free->next = NULL;
        attr = llist_entry(free, struct kernfs_elem_attr, notify_next);
        kn = attribute_to_node(attr, struct kernfs_node, attr);
        root = kernfs_root(kn);
@@ -992,9 +993,11 @@ void kernfs_notify(struct kernfs_node *kn)
        rcu_read_unlock();

        /* schedule work to kick fsnotify */
-       kernfs_get(kn);
-       llist_add(&kn->attr.notify_next, &kernfs_notify_list);
-       schedule_work(&kernfs_notify_work);
+       if (kn->attr.notify_next.next != NULL) {
+               kernfs_get(kn);
+               llist_add(&kn->attr.notify_next, &kernfs_notify_list);
+               schedule_work(&kernfs_notify_work);
+       }
 }
 EXPORT_SYMBOL_GPL(kernfs_notify);


base-commit: 6cc11d2a1759275b856e464265823d94aabd5eaf
-- 
2.30.2


Could you please verify this in your setup? If I can reproduce this issue
locally I will try myself as well.

Thanks,
 -- Imran