staging: lustre: fix 'data race condition' issue in conrpc.c
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.
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-2744
Reviewed-on: http://review.whamcloud.com/6567
Reviewed-by: Liang Zhen <liang.zhen@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/lustre/lnet/selftest/conrpc.c b/drivers/staging/lustre/lnet/selftest/conrpc.c
index e6376a0..8a67f89 100644
--- a/drivers/staging/lustre/lnet/selftest/conrpc.c
+++ b/drivers/staging/lustre/lnet/selftest/conrpc.c
@@ -945,8 +945,12 @@
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) {