On Wed, 2017-08-09 at 16:15 +1000, Michael Ellerman wrote:
> I'm not sure I'm convinced. We can't handle every possible case of the
> higher level code calling us in situations we don't expect.
>
> For example irq_data could be NULL, but we trust the higher level code
> not to do that to us.
>
> Also I don't see any other driver doing this check.
>
> $ git grep irqd_is_started
> include/linux/irq.h:static inline bool irqd_is_started(struct irq_data *d)
> kernel/irq/chip.c: if (irqd_is_started(d)) {
> kernel/irq/chip.c: if (irqd_is_started(&desc->irq_data)) {
> kernel/irq/cpuhotplug.c: if (irqd_is_per_cpu(d) ||
> !irqd_is_started(d) || !irq_needs_fixup(d)) {
irqd_is_started is brand new so you won't find any :-)
For most cases the problem is a non-issue. Due to how xive works, it's
more of a problem for us because a non-started interrupt has no
targetting information at all.
So this is *somewhat* related to xive internal and I'd rather have
that sanity check in there.
Cheers,
Ben.
