genirq: Split out irq_startup() code

Split out the inner workings of irq_startup() so it can be reused to handle
managed interrupts gracefully.

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/20170619235447.033235144@linutronix.de

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index e290d73..1163089 100644 (file)
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -195,6 +195,23 @@ static void irq_state_set_started(struct irq_desc *desc)
        irqd_set(&desc->irq_data, IRQD_IRQ_STARTED);
 }
 
+static int __irq_startup(struct irq_desc *desc)
+{
+       struct irq_data *d = irq_desc_get_irq_data(desc);
+       int ret = 0;
+
+       irq_domain_activate_irq(d);
+       if (d->chip->irq_startup) {
+               ret = d->chip->irq_startup(d);
+               irq_state_clr_disabled(desc);
+               irq_state_clr_masked(desc);
+       } else {
+               irq_enable(desc);
+       }
+       irq_state_set_started(desc);
+       return ret;
+}
+
 int irq_startup(struct irq_desc *desc, bool resend)
 {
        int ret = 0;
@@ -204,19 +221,9 @@ int irq_startup(struct irq_desc *desc, bool resend)
        if (irqd_is_started(&desc->irq_data)) {
                irq_enable(desc);
        } else {
-               irq_domain_activate_irq(&desc->irq_data);
-               if (desc->irq_data.chip->irq_startup) {
-                       ret = desc->irq_data.chip->irq_startup(&desc->irq_data);
-                       irq_state_clr_disabled(desc);
-                       irq_state_clr_masked(desc);
-               } else {
-                       irq_enable(desc);
-               }
-               irq_state_set_started(desc);
-               /* Set default affinity mask once everything is setup */
+               ret = __irq_startup(desc);
                irq_setup_affinity(desc);
        }
-
        if (resend)
                check_irq_resend(desc);