Re: [PATCH v3 2/4] irqchip/imx-irqsteer: Dispose of IRQ mappings in remove()

On Fri, Aug 07, 2026 at 04:23:44PM +0900, [email protected] wrote:
> From: Zhipeng Wang <[email protected]>
>
> remove() tears down the chained handlers and the IRQ domain but never
> disposes of the IRQ mappings it created. The parent mappings from
> irq_of_parse_and_map() and the child mappings handed out by the domain
> are leaked, and the child irq_descs are left pointing at the driver's
> irq_chip past irq_domain_remove().
>
> Dispose of the parent mappings alongside the chained handler teardown,
> and dispose of the child mappings before removing the domain.
>
> Fixes: 0136afa08967 ("irqchip: Add driver for imx-irqsteer controller")
> Signed-off-by: Zhipeng Wang <[email protected]>
> ---
> Changes in v3:
>  - Split out of the single v2 patch. In v2 this was folded into the
>    module-conversion patch; no functional change.
>
>  drivers/irqchip/irq-imx-irqsteer.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/irqchip/irq-imx-irqsteer.c b/drivers/irqchip/irq-imx-irqsteer.c
> index a2f0629b22a3..4a2fe8ba97f5 100644
> --- a/drivers/irqchip/irq-imx-irqsteer.c
> +++ b/drivers/irqchip/irq-imx-irqsteer.c
> @@ -277,7 +277,7 @@ static int imx_irqsteer_probe(struct platform_device *pdev)
>  static void imx_irqsteer_remove(struct platform_device *pdev)
>  {
>  	struct irqsteer_data *irqsteer_data = platform_get_drvdata(pdev);
> -	int i;
> +	int hwirq, i;
>
>  	for (i = 0; i < irqsteer_data->irq_count; i++) {
>  		if (!irqsteer_data->irq[i])
> @@ -285,8 +285,13 @@ static void imx_irqsteer_remove(struct platform_device *pdev)
>
>  		irq_set_chained_handler_and_data(irqsteer_data->irq[i],
>  						 NULL, NULL);
> +		irq_dispose_mapping(irqsteer_data->irq[i]);
>  	}
>
> +	for (hwirq = 0; hwirq < irqsteer_data->reg_num * 32; hwirq++)
> +		irq_dispose_mapping(irq_find_mapping(irqsteer_data->domain,
> +						     hwirq));
> +

only call once irq_of_parse_and_map(), why need irq_dispose_mapping() twice?

Frank

>  	irq_domain_remove(irqsteer_data->domain);
>
>  	clk_disable_unprepare(irqsteer_data->ipg_clk);
> --
> 2.34.1
>
>