genirq/PM: Properly pretend disabled state when force resuming interrupts

Interrupts with the IRQF_FORCE_RESUME flag set have also the
IRQF_NO_SUSPEND flag set. They are not disabled in the suspend path, but
must be forcefully resumed. That's used by XEN to keep IPIs enabled beyond
the suspension of device irqs. Force resume works by pretending that the
interrupt was disabled and then calling __irq_enable().

Incrementing the disabled depth counter was enough to do that, but with the
recent changes which use state flags to avoid unnecessary hardware access,
this is not longer sufficient. If the state flags are not set, then the
hardware callbacks are not invoked and the interrupt line stays disabled in
"hardware".

Set the disabled and masked state when pretending that an interrupt got
disabled by suspend.

Fixes: bf22ff45bed6 ("genirq: Avoid unnecessary low level irq function calls")
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: xen-devel@lists.xenproject.org
Cc: boris.ostrovsky@oracle.com
Link: http://lkml.kernel.org/r/20170717174703.4603-2-jgross@suse.com

1 files changed, 0 insertions, 10 deletions

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index d171bc57e1e0..a3cc37c0c85e 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -170,21 +170,11 @@ static void irq_state_clr_disabled(struct irq_desc *desc)
 	irqd_clear(&desc->irq_data, IRQD_IRQ_DISABLED);
 }
 
-static void irq_state_set_disabled(struct irq_desc *desc)
-{
-	irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
-}
-
 static void irq_state_clr_masked(struct irq_desc *desc)
 {
 	irqd_clear(&desc->irq_data, IRQD_IRQ_MASKED);
 }
 
-static void irq_state_set_masked(struct irq_desc *desc)
-{
-	irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
-}
-
 static void irq_state_clr_started(struct irq_desc *desc)
 {
 	irqd_clear(&desc->irq_data, IRQD_IRQ_STARTED);