[PATCH] eventfs: Use list_add_tail_rcu() for SRCU-protected children list

[David Carlier <devnexen@gmail.com>]

Commit d2603279c7d6 ("eventfs: Use list_del_rcu() for SRCU protected
list variable") converted the removal side to pair with the
list_for_each_entry_srcu() walker in eventfs_iterate(). The insertion
in eventfs_create_dir() was left as a plain list_add_tail(), which on
weakly-ordered architectures can expose a new entry to the SRCU reader
before its list pointers and fields are observable.

Use list_add_tail_rcu() so the publication pairs with the existing
list_del_rcu() and list_for_each_entry_srcu().

Fixes: 43aa6f97c2d0 ("eventfs: Get rid of dentry pointers without refcounts")
Cc: stable@vger.kernel.org
Signed-off-by: David Carlier <devnexen@gmail.com>
---
 fs/tracefs/event_inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c
index 81df94038f2e..8dd554508828 100644
--- a/fs/tracefs/event_inode.c
+++ b/fs/tracefs/event_inode.c
@@ -706,7 +706,7 @@ struct eventfs_inode *eventfs_create_dir(const char *name, struct eventfs_inode
 
 	scoped_guard(mutex, &eventfs_mutex) {
 		if (!parent->is_freed)
-			list_add_tail(&ei->list, &parent->children);
+			list_add_tail_rcu(&ei->list, &parent->children);
 	}
 	/* Was the parent freed? */
 	if (list_empty(&ei->list)) {
-- 
2.53.0