[PATCH v2 1/3] ARM: locomo: use put_device() on device_register() failure

[Sourabh Jain]

On 13/08/26 15:24, Tarun Sahu wrote:
> When device_register() fails, calling kfree(dev) directly bypasses the
> device_release() callback (locomo_dev_release) and leaks internal driver
> core structures allocated during device initialization.
>
> Fix this by replacing direct kfree(dev) with put_device(&dev->dev) when
> device_register() returns an error, ensuring proper refcount decrement
> and cleanup via locomo_dev_release().
>
> Signed-off-by: Tarun Sahu <tarunsahu at google.com>
> ---
>   arch/arm/common/locomo.c | 13 ++++++-------
>   1 file changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/arch/arm/common/locomo.c b/arch/arm/common/locomo.c
> index 55e360452828..0f6689d343b0 100644
> --- a/arch/arm/common/locomo.c
> +++ b/arch/arm/common/locomo.c
> @@ -223,10 +223,8 @@ locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
>   	int ret;
>   
>   	dev = kzalloc_obj(struct locomo_dev);
> -	if (!dev) {
> -		ret = -ENOMEM;
> -		goto out;
> -	}
> +	if (!dev)
> +		return -ENOMEM;
>   
>   	/*
>   	 * If the parent device has a DMA mask associated with it,
> @@ -255,10 +253,11 @@ locomo_init_one_child(struct locomo *lchip, struct locomo_dev_info *info)
>   
>   	ret = device_register(&dev->dev);
>   	if (ret) {
> - out:
> -		kfree(dev);
> +		put_device(&dev->dev);
> +		return ret;
>   	}
> -	return ret;
> +
> +	return 0;
>   }

Changes look good to me. Feel free to add:
Reviewed-by: Sourabh Jain <sourabhjain at linux.ibm.com>

>   
>   #ifdef CONFIG_PM