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[3/6] rhashtable: Wait for RCU readers after final unzip work

Message ID 57434f22bee01ecfec77d3ce318c6b2ee0dea542.1423097592.git.tgraf@suug.ch
State Accepted, archived
Delegated to: David Miller
Headers show

Commit Message

Thomas Graf Feb. 5, 2015, 1:03 a.m. UTC 
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>
---
 lib/rhashtable.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index cea4244..fd1033d 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;
 }