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-rw-r--r--net/ipv4/route.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index a6d7c584f53..8d23cc7efba 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1109,7 +1109,12 @@ restart:
printk("\n");
}
#endif
- rt_hash_table[hash].chain = rt;
+ /*
+ * Since lookup is lockfree, we must make sure
+ * previous writes to rt are comitted to memory
+ * before making rt visible to other CPUS.
+ */
+ rcu_assign_pointer(rt_hash_table[hash].chain, rt);
spin_unlock_bh(rt_hash_lock_addr(hash));
*rp = rt;
return 0;