LU-8935 ptlrpc: missing barrier before wake_up

ptlrpc_client_wake_req() misses a memory barrier, which may cause
strange errors.

Signed-off-by: Lai Siyao <lai.siyao@intel.com>
Change-Id: Ic8e9cbaf8c07f503798b95c608477508204d9614
Reviewed-on: https://review.whamcloud.com/26583
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Wang Shilong <wshilong@ddn.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>

diff --git a/lustre/include/lustre_net.h b/lustre/include/lustre_net.h
index 6c9f530..f705ceb 100644 (file)
--- a/lustre/include/lustre_net.h
+++ b/lustre/include/lustre_net.h
@@ -2517,6 +2517,7 @@ ptlrpc_client_recv_or_unlink(struct ptlrpc_request *req)
 static inline void
 ptlrpc_client_wake_req(struct ptlrpc_request *req)
 {
 static inline void
 ptlrpc_client_wake_req(struct ptlrpc_request *req)
 {

+       smp_mb();

        if (req->rq_set == NULL)
                wake_up(&req->rq_reply_waitq);
        else
        if (req->rq_set == NULL)
                wake_up(&req->rq_reply_waitq);
        else