1 files changed, 4 insertions, 2 deletions

diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 70b33bf780f..df47014e129 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -422,9 +422,11 @@ static void rcu_print_detail_task_stall_rnp(struct rcu_node *rnp)
         unsigned long flags;
         struct task_struct *t;
 
-        if (!rcu_preempt_blocked_readers_cgp(rnp))
-                return;
         raw_spin_lock_irqsave(&rnp->lock, flags);
+        if (!rcu_preempt_blocked_readers_cgp(rnp)) {
+                raw_spin_unlock_irqrestore(&rnp->lock, flags);
+                return;
+        }
         t = list_entry(rnp->gp_tasks,
                        struct task_struct, rcu_node_entry);
         list_for_each_entry_continue(t, &rnp->blkd_tasks, rcu_node_entry)