linux-kernel - [PATCH 1/2] cpuidle: riscv-sbi: fix device node release in early exit of for_each_possible

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Message-Id: <20241030-cpuidle-riscv-sbi-cleanup-v1-1-5e08a22c9409@gmail.com>
Date: Wed, 30 Oct 2024 07:44:09 +0100
From: Javier Carrasco <javier.carrasco.cruz@...il.com>
To: Anup Patel <anup@...infault.org>, 
 "Rafael J. Wysocki" <rafael@...nel.org>, 
 Daniel Lezcano <daniel.lezcano@...aro.org>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Atish Patra <atishp@...osinc.com>
Cc: Palmer Dabbelt <palmer@...osinc.com>, linux-pm@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Javier Carrasco <javier.carrasco.cruz@...il.com>, stable@...r.kernel.org
Subject: [PATCH 1/2] cpuidle: riscv-sbi: fix device node release in early
 exit of for_each_possible_cpu

The 'np' device_node is initialized via of_cpu_device_node_get(), which
requires explicit calls to of_node_put() when it is no longer required
to avoid leaking the resource.

Add the missing calls to of_node_put(np) in all execution paths.

Cc: stable@...r.kernel.org
Fixes: 6abf32f1d9c5 ("cpuidle: Add RISC-V SBI CPU idle driver")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@...il.com>
---
 drivers/cpuidle/cpuidle-riscv-sbi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c
index 14462c092039..2b3aec09b895 100644
--- a/drivers/cpuidle/cpuidle-riscv-sbi.c
+++ b/drivers/cpuidle/cpuidle-riscv-sbi.c
@@ -513,11 +513,14 @@ static int sbi_cpuidle_probe(struct platform_device *pdev)
 		if (np &&
 		    of_property_present(np, "power-domains") &&
 		    of_property_present(np, "power-domain-names")) {
+			of_node_put(np);
 			continue;
 		} else {
 			sbi_cpuidle_use_osi = false;
+			of_node_put(np);
 			break;
 		}
+		of_node_put(np);
 	}

 	/* Populate generic power domains from DT nodes */

-- 
2.43.0