From: Lai Siyao <lai.siyao@intel.com>
Date: Wed, 12 Apr 2017 21:56:50 +0000 (+0800)
Subject: LU-8935 ptlrpc: missing barrier before wake_up
X-Git-Tag: 2.10.51~33
X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=commitdiff_plain;h=33033c27aae361069877d56d44714097a208aa76;ds=sidebyside

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