Re: [PATCH] ACPI: processor: idle: Fix resource rollback in acpi_processor_power_init

["lihuisong (C)" <lihuisong@huawei.com>]

Kindly ping for review.

在 2025/6/19 14:13, Huisong Li 写道:
> There are two resource rollback issues in acpi_processor_power_init:
> 1> Do not unregister acpi_idle_driver when do kzalloc failed.
> 2> Do not free cpuidle device memory when register cpuidle device failed.
>
> Signed-off-by: Huisong Li <lihuisong@huawei.com>
> ---
>   drivers/acpi/processor_idle.c | 24 +++++++++++++++++-------
>   1 file changed, 17 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
> index 2c2dc559e0f8..3548ab9dac9e 100644
> --- a/drivers/acpi/processor_idle.c
> +++ b/drivers/acpi/processor_idle.c
> @@ -1392,8 +1392,10 @@ int acpi_processor_power_init(struct acpi_processor *pr)
>   		}
>   
>   		dev = kzalloc(sizeof(*dev), GFP_KERNEL);
> -		if (!dev)
> -			return -ENOMEM;
> +		if (!dev) {
> +			retval = -ENOMEM;
> +			goto unregister_driver;
> +		}
>   		per_cpu(acpi_cpuidle_device, pr->id) = dev;
>   
>   		acpi_processor_setup_cpuidle_dev(pr, dev);
> @@ -1402,14 +1404,22 @@ int acpi_processor_power_init(struct acpi_processor *pr)
>   		 * must already be registered before registering device
>   		 */
>   		retval = cpuidle_register_device(dev);
> -		if (retval) {
> -			if (acpi_processor_registered == 0)
> -				cpuidle_unregister_driver(&acpi_idle_driver);
> -			return retval;
> -		}
> +		if (retval)
> +			goto free_cpuidle_device;
> +
>   		acpi_processor_registered++;
>   	}
>   	return 0;
> +
> +free_cpuidle_device:
> +	per_cpu(acpi_cpuidle_device, pr->id) = NULL;
> +	kfree(dev);
> +
> +unregister_driver:
> +	if (acpi_processor_registered == 0)
> +		cpuidle_unregister_driver(&acpi_idle_driver);
> +
> +	return retval;
>   }
>   
>   int acpi_processor_power_exit(struct acpi_processor *pr)