LU-13892 lnet: lock-up during router check

[fs/lustre-release.git] / lnet / lnet / router.c

diff --git a/lnet/lnet/router.c b/lnet/lnet/router.c
index 806cf8c..e2966cf 100644 (file)
--- a/lnet/lnet/router.c
+++ b/lnet/lnet/router.c
@@ -842,6 +842,7 @@ lnet_wait_known_routerstate(void)
 
        LASSERT(the_lnet.ln_mt_state == LNET_MT_STATE_RUNNING);
 
+       /* the_lnet.ln_api_mutex must be locked */
        for (;;) {
                int cpt = lnet_net_lock_current();
 
@@ -865,8 +866,10 @@ lnet_wait_known_routerstate(void)
                if (all_known)
                        return;
 
+               mutex_unlock(&the_lnet.ln_api_mutex);
                set_current_state(TASK_UNINTERRUPTIBLE);
                schedule_timeout(cfs_time_seconds(1));
+               mutex_lock(&the_lnet.ln_api_mutex);
        }
 }