On 2020-08-19 14:31, Mark-PK Tsai wrote:
From: Marc Zyngier <maz@xxxxxxxxxx>
> +
> +static int mst_intc_domain_alloc(struct irq_domain *domain, unsigned
> int virq,
> + unsigned int nr_irqs, void *data)
> +{
> + int i;
> + irq_hw_number_t hwirq;
> + struct irq_fwspec parent_fwspec, *fwspec = data;
> + struct mst_intc_chip_data *cd = (struct mst_intc_chip_data
> *)domain->host_data;
No cast necessary here.
> +
> + /* Not GIC compliant */
> + if (fwspec->param_count != 3)
> + return -EINVAL;
> +
> + /* No PPI should point to this domain */
> + if (fwspec->param[0])
> + return -EINVAL;
> +
> + if (fwspec->param[1] >= cd->nr_irqs)
This condition is bogus, as it doesn't take into account the nr_irqs
parameter.
The hwirq number need to be in the irq map range. (property:
mstar,irqs-map-range)
If it's not, it must be incorrect configuration.
I agree. And since you are checking whether the configuration is
correct,
it'd better be completely correct.
So how about use the condition as following?
if (hwirq >= cd->nr_irqs)
return -EINVAL;
Again, this says nothing of the validity of (hwirq + nr_irqs - 1)...
> + return -EINVAL;
> +
> + hwirq = fwspec->param[1];
> + for (i = 0; i < nr_irqs; i++)
> + irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
> + &mst_intc_chip,
> + domain->host_data);
... which you are using here.
M.
--
Jazz is not dead. It just smells funny...
