Schedule affinity_notify work while migrating IRQs during hot plug

Commit Message

Prasad Sodagudi Feb. 21, 2017, 8:59 p.m. UTC

Hi Thomas,

Currently irq_set_affinity() is called to migrate irqs from 
migrate_one_irq()
during cpu hot plug and clients which are interested to know the irq 
affinity change
not getting notified

take_cpu_down () --> __cpu_disable() --> irq_migrate_all_off_this_cpu();

irq_set_affinity() is changing the IRQ affinity at chip level
but it is not notifying the affinity_notify work.

How about below change, so that clients drivers gets notified about irq 
affinity changes?

With this change, notifications of IRQ affinity gets executed and 
notified
to client drivers.

Patch

--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -207,6 +207,7 @@  int irq_do_set_affinity(struct irq_data *data, const 
struct cpumask *mask,
         case IRQ_SET_MASK_OK_DONE:
                 cpumask_copy(desc->irq_common_data.affinity, mask);
         case IRQ_SET_MASK_OK_NOCOPY:
+               schedule_work(&desc->affinity_notify->work);
                 irq_set_thread_affinity(desc);
                 ret = 0;