[PATCH v2] docs/RCU: Add the missing rcu_read_unlock()

[Alan Huang <mmpgouride@xxxxxxxxx>]

We should exit the RCU read-side critical section before re-entering.

Signed-off-by: Alan Huang <mmpgouride@xxxxxxxxx>
---
 Documentation/RCU/rculist_nulls.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/RCU/rculist_nulls.rst b/Documentation/RCU/rculist_nulls.rst
index 9a734bf54..0612a6387 100644
--- a/Documentation/RCU/rculist_nulls.rst
+++ b/Documentation/RCU/rculist_nulls.rst
@@ -29,8 +29,10 @@ algorithms:
   rcu_read_lock()
   obj = lockless_lookup(key);
   if (obj) {
-    if (!try_get_ref(obj)) // might fail for free objects
+    if (!try_get_ref(obj)) { // might fail for free objects
+      rcu_read_unlock();
       goto begin;
+    }
     /*
     * Because a writer could delete object, and a writer could
     * reuse these object before the RCU grace period, we
-- 
2.34.1