[PATCH v1] irqchip/gic-v3-its: Fix OF node reference leak

[Yuho Choi <dbgh9129@gmail.com>]

of_get_cpu_node() returns a referenced device node. In
its_cpu_init_collection(), the node is only used to get the CPU NUMA
node for the Cavium 23144 workaround, but the reference is never
dropped.

Store the NUMA node locally and call of_node_put() before either
continuing with collection setup or returning early for a NUMA mismatch.

Fixes: 920181ce8469 ("irqchip/gic-v3-its: Add ability to resend MAPC on resume")
Signed-off-by: Yuho Choi <dbgh9129@gmail.com>
---
 drivers/irqchip/irq-gic-v3-its.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
index b57d81ad33a0..f82035eb77e5 100644
--- a/drivers/irqchip/irq-gic-v3-its.c
+++ b/drivers/irqchip/irq-gic-v3-its.c
@@ -3291,10 +3291,14 @@ static void its_cpu_init_collection(struct its_node *its)
 	/* avoid cross node collections and its mapping */
 	if (its->flags & ITS_FLAGS_WORKAROUND_CAVIUM_23144) {
 		struct device_node *cpu_node;
+		int cpu_nid;
 
 		cpu_node = of_get_cpu_node(cpu, NULL);
+		cpu_nid = of_node_to_nid(cpu_node);
+		of_node_put(cpu_node);
+
 		if (its->numa_node != NUMA_NO_NODE &&
-			its->numa_node != of_node_to_nid(cpu_node))
+		    its->numa_node != cpu_nid)
 			return;
 	}
 
-- 
2.43.0