rhashtable: Wait for RCU readers after final unzip work

We need to wait for all RCU readers to complete after the last bit of
unzipping has been completed. Otherwise the old table is freed up
prematurely.

Fixes: 7e1e77636e36 ("lib: Resizable, Scalable, Concurrent Hash Table")
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 0 deletions

diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index cea4244e032b..fd1033d518c6 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -392,6 +392,8 @@ int rhashtable_expand(struct rhashtable *ht)
                 }
         }
 
+        synchronize_rcu();
+
         bucket_table_free(old_tbl);
         return 0;
 }