Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / net / ipv4 / route.c
index 942be04..2ea6dcc 100644 (file)
@@ -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;