LU-5397 obdclass: optimize busy loop wait

[fs/lustre-release.git] / lustre / obdclass / obd_config.c

diff --git a/lustre/obdclass/obd_config.c b/lustre/obdclass/obd_config.c
index 645e5aa..3914193 100644 (file)
--- a/lustre/obdclass/obd_config.c
+++ b/lustre/obdclass/obd_config.c
@@ -624,16 +624,12 @@ int class_cleanup(struct obd_device *obd, struct lustre_cfg *lcfg)
        }
        /* Leave this on forever */
        obd->obd_stopping = 1;
+       spin_unlock(&obd->obd_dev_lock);
 
        /* wait for already-arrived-connections to finish. */
-       while (obd->obd_conn_inprogress > 0) {
-               spin_unlock(&obd->obd_dev_lock);
-
-               cond_resched();
-
-               spin_lock(&obd->obd_dev_lock);
-       }
-       spin_unlock(&obd->obd_dev_lock);
+       while (obd->obd_conn_inprogress > 0)
+               yield();
+       smp_rmb();
 
         if (lcfg->lcfg_bufcount >= 2 && LUSTRE_CFG_BUFLEN(lcfg, 1) > 0) {
                 for (flag = lustre_cfg_string(lcfg, 1); *flag != 0; flag++)