[PATCH] rcu: tree_stall: Correctly unlock root node in rcu_check_gp_start_stall

[Neeraj Upadhyay]

Only unlock the root node, if current node (rnp) is not
root node.

Signed-off-by: Neeraj Upadhyay <neer...@codeaurora.org>
---
 kernel/rcu/tree_stall.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
index f65a73a..0651833 100644
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@ -630,7 +630,9 @@ static void rcu_check_gp_start_stall(struct rcu_node *rnp, 
struct rcu_data *rdp,
            time_before(j, rcu_state.gp_req_activity + gpssdelay) ||
            time_before(j, rcu_state.gp_activity + gpssdelay) ||
            atomic_xchg(&warned, 1)) {
-               raw_spin_unlock_rcu_node(rnp_root); /* irqs remain disabled. */
+               if (rnp_root != rnp)
+                       /* irqs remain disabled. */
+                       raw_spin_unlock_rcu_node(rnp_root);
                raw_spin_unlock_irqrestore_rcu_node(rnp, flags);
                return;
        }
-- 
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