From 3dc89bdaa3e42c82234363d684f3e79d552ccfb0 Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kent.overstreet@gmail.com>
Date: Tue, 18 Dec 2018 14:43:00 -0500
Subject: bcachefs: fix an rcu usage bug

---
 fs/bcachefs/io.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/bcachefs/io.c b/fs/bcachefs/io.c
index ede1ac1b62d1..64637687bf40 100644
--- a/fs/bcachefs/io.c
+++ b/fs/bcachefs/io.c
@@ -946,6 +946,7 @@ void bch2_write(struct closure *cl)
 
 struct promote_op {
 	struct closure		cl;
+	struct rcu_head		rcu;
 	u64			start_time;
 
 	struct rhash_head	hash;
@@ -999,7 +1000,7 @@ static void promote_free(struct bch_fs *c, struct promote_op *op)
 				     bch_promote_params);
 	BUG_ON(ret);
 	percpu_ref_put(&c->writes);
-	kfree(op);
+	kfree_rcu(op, rcu);
 }
 
 static void promote_done(struct closure *cl)
-- 
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