Hi Thomas,
On 09/02/2016 09:10 PM, Thomas Gleixner wrote:
> On Fri, 2 Sep 2016, Alexandre TORGUE wrote:
>> +static int stm32_gpio_domain_translate(struct irq_domain *d,
>> + struct irq_fwspec *fwspec,
>> + unsigned long *hwirq,
>> + unsigned int *type)
>> +{
>> + if ((fwspec->param_count != 2) ||
>> + (fwspec->param[0] >= STM32_GPIO_IRQ_LINE))
>> + return -EINVAL;
>
> Just a nitpick. This is unnecessarily hard to parse because you indented
> the line break like a conditional statement
I agree. I will modify it as the one below.
>
>> + if ((fwspec->param_count != 2) ||
>> + (fwspec->param[0] >= STM32_GPIO_IRQ_LINE))
>> + return -EINVAL;
>
> Makes it immediately obvious that the second line belongs to the if.
>
>> +static void stm32_gpio_domain_activate(struct irq_domain *d,
>> + struct irq_data *irq_data)
>> +{
>> + struct stm32_gpio_bank *bank = d->host_data;
>> + struct stm32_pinctrl *pctl = dev_get_drvdata(bank->gpio_chip.parent);
>> +
>> + if (gpiochip_lock_as_irq(&bank->gpio_chip, irq_data->hwirq)) {
>> + dev_err(pctl->dev,
>> + "Unable to configure STM32 %s%ld as IRQ\n",
>> + bank->gpio_chip.label, irq_data->hwirq);
>> + return;
>
> Hmm, that's nasty. When an interrupt is mapped then we don't expect the
> activate function to fail. You really should lock that interrupt when it's
> mapped.
Ok. I will remove it from here.
>
>> + }
>> + regmap_field_write(pctl->irqmux[irq_data->hwirq], bank->range.id);
>> +}
>
>> +static int stm32_gpio_domain_alloc(struct irq_domain *domain,
>> + unsigned int virq,
>> + unsigned int nr_irqs, void *data)
>> +{
>> + struct irq_fwspec *fwspec = data;
>> + struct irq_fwspec parent_fwspec;
>> + struct stm32_pinctrl *pctl = domain->host_data;
>> + irq_hw_number_t hwirq;
>> + unsigned int i;
>> +
>> + hwirq = fwspec->param[0];
>> + for (i = 0; i < nr_irqs; i++)
>> + irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
>> + &stm32_gpio_irq_chip, pctl);
>> +
>> + parent_fwspec.fwnode = domain->parent->fwnode;
>> + parent_fwspec.param_count = 2;
>> + parent_fwspec.param[0] = fwspec->param[0];
>> + parent_fwspec.param[1] = fwspec->param[1];
>> +
>> + return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
>> + &parent_fwspec);
>
> So doing it here would be probably the right thing to do:
>
>
> ret = gpiochip_lock_as_irq();
> if (ret)
> return ret;
>
> ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
> &parent_fwspec);
> if (ret)
> gpiochip_unlock_as_irq();
>
> return ret;
>
> So of course you need your own free() function which undoes that lock
> thingy.
Ok thanks for proposal.
Best regards.
Alex
>
> Thanks,
>
> tglx
>
