[PATCH v3] cpuidle: riscv-sbi: fix device node release in early exit of for_each_possible_cpu
Javier Carrasco
javier.carrasco.cruz at gmail.com
Fri Nov 15 15:32:39 PST 2024
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.
Instead of adding the missing calls to of_node_put() in all execution
paths, use the cleanup attribute for 'np' by means of the __free()
macro, which automatically calls of_node_put() when the variable goes
out of scope. Given that 'np' is only used within the
for_each_possible_cpu(), reduce its scope to release the nood after
every iteration of the loop.
Fixes: 6abf32f1d9c5 ("cpuidle: Add RISC-V SBI CPU idle driver")
Reviewed-by: Andrew Jones <ajones at ventanamicro.com>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz at gmail.com>
---
Changes in v3:
- Unwrap line (100 char width).
- Link to v2: https://lore.kernel.org/r/20241031-cpuidle-riscv-sbi-cleanup-v2-1-aae62d383118@gmail.com
Changes in v2:
- Squash patches for mainline solution without intermediate steps.
- Link to v1: https://lore.kernel.org/r/20241030-cpuidle-riscv-sbi-cleanup-v1-0-5e08a22c9409@gmail.com
---
drivers/cpuidle/cpuidle-riscv-sbi.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c
index 14462c092039..0c92a628bbd4 100644
--- a/drivers/cpuidle/cpuidle-riscv-sbi.c
+++ b/drivers/cpuidle/cpuidle-riscv-sbi.c
@@ -504,12 +504,12 @@ static int sbi_cpuidle_probe(struct platform_device *pdev)
int cpu, ret;
struct cpuidle_driver *drv;
struct cpuidle_device *dev;
- struct device_node *np, *pds_node;
+ struct device_node *pds_node;
/* Detect OSI support based on CPU DT nodes */
sbi_cpuidle_use_osi = true;
for_each_possible_cpu(cpu) {
- np = of_cpu_device_node_get(cpu);
+ struct device_node *np __free(device_node) = of_cpu_device_node_get(cpu);
if (np &&
of_property_present(np, "power-domains") &&
of_property_present(np, "power-domain-names")) {
---
base-commit: 744cf71b8bdfcdd77aaf58395e068b7457634b2c
change-id: 20241029-cpuidle-riscv-sbi-cleanup-e9b3cb96e16d
Best regards,
--
Javier Carrasco <javier.carrasco.cruz at gmail.com>
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