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cpuidle: riscv-sbi: fix device node release in early exit of for_each_possible_cpu

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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@ventanamicro.com>
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://lore.kernel.org/r/20241116-cpuidle-riscv-sbi-cleanup-v3-1-a3a46372ce08@gmail.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Javier Carrasco 2024-11-16 00:32:39 +01:00 committed by Palmer Dabbelt
parent 13134cc949
commit 7e25044b80
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1 changed files with 2 additions and 2 deletions
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4
drivers/cpuidle/cpuidle-riscv-sbi.c
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@ -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")) {