On Sat, Sep 16, 2023 at 5:10 PM Christophe JAILLET
<christophe.jaillet@xxxxxxxxxx> wrote:
>
> Le 03/09/2023 à 19:02, Bartosz Golaszewski a écrit :
> > On Sun, Sep 3, 2023 at 8:13 AM Christophe JAILLET
> > <christophe.jaillet@xxxxxxxxxx> wrote:
> >>
> >> If an error occurs after a successful irq_domain_add_linear() call, it
> >> should be undone by a corresponding irq_domain_remove(), as already done
> >> in the remove function.
> >>
> >> Fixes: c6ce2b6bffe5 ("gpio: add TB10x GPIO driver")
> >> Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
> >> ---
> >> drivers/gpio/gpio-tb10x.c | 6 +++++-
> >> 1 file changed, 5 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/gpio/gpio-tb10x.c b/drivers/gpio/gpio-tb10x.c
> >> index 78f8790168ae..f96d260a4a19 100644
> >> --- a/drivers/gpio/gpio-tb10x.c
> >> +++ b/drivers/gpio/gpio-tb10x.c
> >> @@ -195,7 +195,7 @@ static int tb10x_gpio_probe(struct platform_device *pdev)
> >> handle_edge_irq, IRQ_NOREQUEST, IRQ_NOPROBE,
> >> IRQ_GC_INIT_MASK_CACHE);
> >> if (ret)
> >> - return ret;
> >> + goto err_remove_domain;
> >>
> >> gc = tb10x_gpio->domain->gc->gc[0];
> >> gc->reg_base = tb10x_gpio->base;
> >> @@ -209,6 +209,10 @@ static int tb10x_gpio_probe(struct platform_device *pdev)
> >> }
> >>
> >> return 0;
> >> +
> >> +err_remove_domain:
> >> + irq_domain_remove(tb10x_gpio->domain);
> >> + return ret;
> >> }
> >>
> >> static int tb10x_gpio_remove(struct platform_device *pdev)
> >> --
> >> 2.34.1
> >>
> >
> > That's not enough, you also need to dispose of all remaining mappings.
> > Please see drivers/gpio/gpiolib.c and how it handles the gpio_irq_chip
> > domain.
>
> Hi,
>
> you'll have to give me more explanation because I've not been able to
> find anything useful to me.
>
I should have expressed myself clearer. Your patch is correct and I
will queue it. But in your remove callback, you'll need to go through
the existing irq mappings and dispose of them before returning. Please
see gpiochip_irqchip_remove()[1]. You can send it as a follow-up.
Bart
[1] https://elixir.bootlin.com/linux/latest/source/drivers/gpio/gpiolib.c#L1725
