genirq: Move initial affinity setup to irq_startup()

The startup vs. setaffinity ordering of interrupts depends on the
IRQF_NOAUTOEN flag. Chained interrupts are not getting any affinity
assignment at all.

A regular interrupt is started up and then the affinity is set. A
IRQF_NOAUTOEN marked interrupt is not started up, but the affinity is set
nevertheless.

Move the affinity setup to startup_irq() so the ordering is always the same
and chained interrupts get the proper default affinity assigned as well.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Hellwig <hch@lst.de>
Link: http://lkml.kernel.org/r/20170619235445.020534783@linutronix.de

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index bc1331f..e290d73 100644 (file)
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -213,6 +213,8 @@ int irq_startup(struct irq_desc *desc, bool resend)
                        irq_enable(desc);
                }
                irq_state_set_started(desc);
+               /* Set default affinity mask once everything is setup */
+               irq_setup_affinity(desc);
        }
 
        if (resend)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 907fb79..1e28307 100644 (file)
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -1327,6 +1327,12 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
                if (new->flags & IRQF_ONESHOT)
                        desc->istate |= IRQS_ONESHOT;
 
+               /* Exclude IRQ from balancing if requested */
+               if (new->flags & IRQF_NOBALANCING) {
+                       irq_settings_set_no_balancing(desc);
+                       irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
+               }
+
                if (irq_settings_can_autoenable(desc)) {
                        irq_startup(desc, true);
                } else {
@@ -1341,15 +1347,6 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
                        desc->depth = 1;
                }
 
-               /* Exclude IRQ from balancing if requested */
-               if (new->flags & IRQF_NOBALANCING) {
-                       irq_settings_set_no_balancing(desc);
-                       irqd_set(&desc->irq_data, IRQD_NO_BALANCING);
-               }
-
-               /* Set default affinity mask once everything is setup */
-               irq_setup_affinity(desc);
-
        } else if (new->flags & IRQF_TRIGGER_MASK) {
                unsigned int nmsk = new->flags & IRQF_TRIGGER_MASK;
                unsigned int omsk = irqd_get_trigger_type(&desc->irq_data);