On Wed, Oct 28 2020 at 20:33, John Garry wrote:
>
> +int irq_update_affinity_desc(unsigned int irq,
> + struct irq_affinity_desc *affinity)
> +{
> + unsigned long flags;
> + struct irq_desc *desc = irq_get_desc_lock(irq, &flags, 0);
> +
> + if (!desc)
> + return -EINVAL;
Just looking at it some more. This needs a check whether the interrupt
is actually shut down. Otherwise the update will corrupt
state. Something like this:
if (irqd_is_started(&desc->irq_data))
return -EBUSY;
But all of this can't work on x86 due to the way how vector allocation
works. Let me think about that.
Thanks,
tglx
