Trond Myklebust 1166fde6a9 SUNRPC: Add barriers to ensure read ordering in rpc_wake_up_task_queue_locked ...

We need to be careful when testing task->tk_waitqueue in
rpc_wake_up_task_queue_locked, because it can be changed while we
are holding the queue->lock.
By adding appropriate memory barriers, we can ensure that it is safe to
test task->tk_waitqueue for equality if the RPC_TASK_QUEUED bit is set.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org

2013-03-25 11:23:40 -04:00

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