staging/lustre/obdclass: fix a race in recovery

in "class_export_recovery_cleanup", the check of the flag
"exp->exp_req_replay_needed" should be protected by "exp_lock".

Signed-off-by: Hongchao Zhang <hongchao.zhang@intel.com>
Reviewed-on: http://review.whamcloud.com/10849
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5128
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/obdclass/genops.c b/drivers/staging/lustre/lustre/obdclass/genops.c
index 736ca41..8250821 100644 (file)
--- a/drivers/staging/lustre/lustre/obdclass/genops.c
+++ b/drivers/staging/lustre/lustre/obdclass/genops.c
@@ -1151,22 +1151,24 @@ void class_export_recovery_cleanup(struct obd_export *exp)
                        exp->exp_obd->obd_stale_clients++;
        }
        spin_unlock(&obd->obd_recovery_task_lock);
+
+       spin_lock(&exp->exp_lock);
        /** Cleanup req replay fields */
        if (exp->exp_req_replay_needed) {
-               spin_lock(&exp->exp_lock);
                exp->exp_req_replay_needed = 0;
-               spin_unlock(&exp->exp_lock);
+
                LASSERT(atomic_read(&obd->obd_req_replay_clients));
                atomic_dec(&obd->obd_req_replay_clients);
        }
+
        /** Cleanup lock replay data */
        if (exp->exp_lock_replay_needed) {
-               spin_lock(&exp->exp_lock);
                exp->exp_lock_replay_needed = 0;
-               spin_unlock(&exp->exp_lock);
+
                LASSERT(atomic_read(&obd->obd_lock_replay_clients));
                atomic_dec(&obd->obd_lock_replay_clients);
        }
+       spin_unlock(&exp->exp_lock);
 }
 
 /* This function removes 1-3 references from the export: