[PATCH 7.1 021/271] ARM: npcm: Fix OF node refcount leaks in SMP setup

7.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yuho Choi <[email protected]>

[ Upstream commit 8eb052f48331474c2789d07b7f11165c323bd2f9 ]

npcm7xx_smp_boot_secondary() and npcm7xx_smp_prepare_cpus() look up
the GCR and SCU nodes with of_find_compatible_node(). The returned
nodes are used for of_iomap(), but the node references are never
released.

of_iomap() does not consume the device node reference, and iounmap()
only releases the MMIO mapping. Drop each node reference after the
corresponding mapping attempt.

Fixes: 7bffa14c9aed ("arm: npcm: add basic support for Nuvoton BMCs")
Signed-off-by: Yuho Choi <[email protected]>
Reviewed-by: Avi Fishman <[email protected]>
Signed-off-by: Andrew Jeffery <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
 arch/arm/mach-npcm/platsmp.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/mach-npcm/platsmp.c b/arch/arm/mach-npcm/platsmp.c
index 41891d3aa1247..4c1fc9983746c 100644
--- a/arch/arm/mach-npcm/platsmp.c
+++ b/arch/arm/mach-npcm/platsmp.c
@@ -32,6 +32,7 @@ static int npcm7xx_smp_boot_secondary(unsigned int cpu,
 		goto out;
 	}
 	gcr_base = of_iomap(gcr_np, 0);
+	of_node_put(gcr_np);
 	if (!gcr_base) {
 		pr_err("could not iomap gcr");
 		ret = -ENOMEM;
@@ -60,6 +61,7 @@ static void __init npcm7xx_smp_prepare_cpus(unsigned int max_cpus)
 		return;
 	}
 	scu_base = of_iomap(scu_np, 0);
+	of_node_put(scu_np);
 	if (!scu_base) {
 		pr_err("could not iomap scu");
 		return;
-- 
2.53.0