[PATCH v1] ARM: tegra: Fix OF node reference leaks in IRQ init

[Yuho Choi]

tegra114_gic_cpu_pm_registration() and tegra_init_irq() use
of_find_matching_node() for temporary IRQ init lookups, but the helper
returns a referenced node even when the result is used only as a boolean
or as an of_iomap() input.

Use scoped device_node cleanup for both lookups so the references are
dropped when the functions return.

Fixes: 7e8b15dbc392 ("ARM: tegra114: Reprogram GIC CPU interface to bypass IRQ on CPU PM entry")
Fixes: e9479e0e832b ("ARM: tegra: skip gic_arch_extn setup if DT has a LIC node")
Signed-off-by: Yuho Choi <dbgh9129 at gmail.com>
---
 arch/arm/mach-tegra/irq.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-tegra/irq.c b/arch/arm/mach-tegra/irq.c
index 4e1ee70b2a3f..e5a611dce7e7 100644
--- a/arch/arm/mach-tegra/irq.c
+++ b/arch/arm/mach-tegra/irq.c
@@ -66,9 +66,9 @@ static const struct of_device_id tegra114_dt_gic_match[] __initconst = {
 
 static void __init tegra114_gic_cpu_pm_registration(void)
 {
-	struct device_node *dn;
+	struct device_node *dn __free(device_node) =
+		of_find_matching_node(NULL, tegra114_dt_gic_match);
 
-	dn = of_find_matching_node(NULL, tegra114_dt_gic_match);
 	if (!dn)
 		return;
 
@@ -88,7 +88,10 @@ static const struct of_device_id tegra_ictlr_match[] __initconst = {
 
 void __init tegra_init_irq(void)
 {
-	if (WARN_ON(!of_find_matching_node(NULL, tegra_ictlr_match)))
+	struct device_node *dn __free(device_node) =
+		of_find_matching_node(NULL, tegra_ictlr_match);
+
+	if (WARN_ON(!dn))
 		pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
 
 	tegra114_gic_cpu_pm_registration();
-- 
2.43.0