linux-kernel - [PATCH 20/39] staging/lustre/build: fix 'data race condition' issues

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Message-Id: <1384446782-13741-21-git-send-email-bergwolf@gmail.com>
Date:	Fri, 15 Nov 2013 00:32:43 +0800
From:	Peng Tao <bergwolf@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Sebastien Buisson <sebastien.buisson@...l.net>,
	Peng Tao <bergwolf@...il.com>,
	Andreas Dilger <andreas.dilger@...el.com>
Subject: [PATCH 20/39] staging/lustre/build: fix 'data race condition' issues

From: Sebastien Buisson <sebastien.buisson@...l.net>

Fix 'data race condition' defects found by Coverity version
6.5.0:
Data race condition (MISSING_LOCK)
Accessing variable without holding lock. Elsewhere,
this variable is accessed with lock held.

Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-2744
Lustre-change: http://review.whamcloud.com/6567
Signed-off-by: Sebastien Buisson <sebastien.buisson@...l.net>
Reviewed-by: Liang Zhen <liang.zhen@...el.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@...el.com>
Reviewed-by: Oleg Drokin <oleg.drokin@...el.com>
Signed-off-by: Peng Tao <bergwolf@...il.com>
Signed-off-by: Andreas Dilger <andreas.dilger@...el.com>
---
 drivers/staging/lustre/lnet/selftest/conrpc.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/lustre/lnet/selftest/conrpc.c b/drivers/staging/lustre/lnet/selftest/conrpc.c
index 4d48c77..d600823 100644
--- a/drivers/staging/lustre/lnet/selftest/conrpc.c
+++ b/drivers/staging/lustre/lnet/selftest/conrpc.c
@@ -938,8 +938,12 @@ lstcon_sesnew_stat_reply(lstcon_rpc_trans_t *trans,
 		return status;
 
 	if (!trans->tas_feats_updated) {
-		trans->tas_feats_updated = 1;
-		trans->tas_features = reply->msg_ses_feats;
+		spin_lock(&console_session.ses_rpc_lock);
+		if (!trans->tas_feats_updated) { /* recheck with lock */
+			trans->tas_feats_updated = 1;
+			trans->tas_features = reply->msg_ses_feats;
+		}
+		spin_unlock(&console_session.ses_rpc_lock);
 	}
 
 	if (reply->msg_ses_feats != trans->tas_features) {
-- 
1.7.9.5

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