staging/lustre/obdclass: fix a race in recovery
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 <220277d2aa6211a73373bb6fdc54bef9342a3a38@intel.com>
Reviewed-on: http://review.whamcloud.com/10849
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-5128
Reviewed-by: Fan Yong <ab453e5c5a64c8df72d3573911da2af406d0c762@intel.com>
Reviewed-by: Andreas Dilger <fb9bfcd2d82414390637ce05921b7d9f9341a408@intel.com>
Signed-off-by: Oleg Drokin <65b2ca07820e940f66d8901813c729ec10a548f5@intel.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs