Re: [PATCH] mfd: hi655x-pmic: fix IRQ action memory leak on removal

[Lee Jones <lee@kernel.org>]

On Tue, 27 Oct 2026, Guangshuo Li wrote:

> hi655x_pmic_remove() currently removes the regmap IRQ chip before
> removing the MFD child devices. regmap_del_irq_chip() disposes the
> child IRQ mappings and removes their IRQ descriptors.
> 
> The hi65xx-powerkey child registers interrupt handlers using
> devm_request_any_context_irq(). During child device removal, the
> device-managed cleanup calls free_irq(), but the corresponding IRQ
> descriptors are no longer available. As a result, the allocated
> struct irqaction objects referenced by irq_desc->action are not
> freed, causing a memory leak.
> 
> Remove the MFD child devices first, allowing their device-managed
> IRQ handlers to be released while the IRQ mappings are still valid.
> Then remove the regmap IRQ chip and its IRQ domain.
> 
> This issue was found by our static analysis tool under development.
> 
> Fixes: eb10245fb37e ("mfd: hi655x-pmic: Add powerkey device to hi655x PMIC driver")
> Cc: stable@vger.kernel.org
> Signed-off-by: Guangshuo Li <lgs201920130244@gmail.com>
> ---
>  drivers/mfd/hi655x-pmic.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mfd/hi655x-pmic.c b/drivers/mfd/hi655x-pmic.c
> index 5cb392892c19..3a7ccc9d30b7 100644
> --- a/drivers/mfd/hi655x-pmic.c
> +++ b/drivers/mfd/hi655x-pmic.c
> @@ -147,8 +147,8 @@ static void hi655x_pmic_remove(struct platform_device *pdev)
>  {
>  	struct hi655x_pmic *pmic = platform_get_drvdata(pdev);
>  
> -	regmap_del_irq_chip(gpiod_to_irq(pmic->gpio), pmic->irq_data);
>  	mfd_remove_devices(&pdev->dev);
> +	regmap_del_irq_chip(gpiod_to_irq(pmic->gpio), pmic->irq_data);

What about devm_regmap_add_irq_chip() and devm_mfd_*()?

>  }
>  
>  static const struct of_device_id hi655x_pmic_match[] = {
> -- 
> 2.43.0
> 

-- 
Lee Jones