Hi Thomas,

On 09/02/2016 09:10 PM, Thomas Gleixner wrote:

On Fri, 2 Sep 2016, Alexandre TORGUE wrote:

quoted

+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.

quoted

+	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.

quoted

+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.

quoted

+	}
+	regmap_field_write(pctl->irqmux[irq_data->hwirq], bank->range.id);
+}

quoted

+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