Re: [PATCH] gpio: dwapb: Fix missing conversion to GPIO-lib-based IRQ-chip

[Serge Semin]

On Fri, Oct 16, 2020 at 11:35:44PM +0800, Jia He wrote:
> Commit 0ea683931adb ("gpio: dwapb: Convert driver to using the
> GPIO-lib-based IRQ-chip") missed the case in dwapb_irq_set_wake().
> 
> Without this fix, probing the dwapb gpio driver will hit a error:
> "address between user and kernel address ranges" on a Ampere armv8a
> server and cause a panic.

It's strange I didn't get the same panic. Anyway, good catch! Certainly:
Acked-by: Serge Semin <fancer.lancer@xxxxxxxxx>

> 
> Fixes: 0ea683931adb ("gpio: dwapb: Convert driver to using the
> GPIO-lib-based IRQ-chip")
> Signed-off-by: Jia He <justin.he@xxxxxxx>
> ---
>  drivers/gpio/gpio-dwapb.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
> index a5b326754124..2a9046c0fb16 100644
> --- a/drivers/gpio/gpio-dwapb.c
> +++ b/drivers/gpio/gpio-dwapb.c
> @@ -343,8 +343,8 @@ static int dwapb_irq_set_type(struct irq_data *d, u32 type)
>  #ifdef CONFIG_PM_SLEEP
>  static int dwapb_irq_set_wake(struct irq_data *d, unsigned int enable)
>  {
> -	struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
> -	struct dwapb_gpio *gpio = igc->private;
> +	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +	struct dwapb_gpio *gpio = to_dwapb_gpio(gc);
>  	struct dwapb_context *ctx = gpio->ports[0].ctx;
>  	irq_hw_number_t bit = irqd_to_hwirq(d);
>  
> -- 
> 2.17.1
>