sunrpc: Use rcu_barrier() on unload.
authorJesper Dangaard Brouer <hawk@comx.dk>
Fri, 26 Jun 2009 10:45:58 +0000 (10:45 +0000)
committerDavid S. Miller <davem@davemloft.net>
Fri, 26 Jun 2009 20:51:34 +0000 (13:51 -0700)
The sunrpc module uses rcu_call() thus it should use rcu_barrier() on
module unload.

Have not verified that the possibility for new call_rcu() callbacks
has been disabled.  As a hint for checking, the functions calling
call_rcu() (unx_destroy_cred and generic_destroy_cred) are
registered as crdestroy function pointer in struct rpc_credops.

Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Jesper Dangaard Brouer <hawk@comx.dk>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/sunrpc/sunrpc_syms.c

index 843629f557630d07b0b4b0e29eb5a6f9feddce88..adaa81982f7469a31c0aa4af418ea74014312f9e 100644 (file)
@@ -66,6 +66,7 @@ cleanup_sunrpc(void)
 #ifdef CONFIG_PROC_FS
        rpc_proc_exit();
 #endif
+       rcu_barrier(); /* Wait for completion of call_rcu()'s */
 }
 MODULE_LICENSE("GPL");
 module_init(init_sunrpc);