genirq: Add IRQCHIP_SKIP_SET_WAKE flag

Some irq chips need the irq_set_wake() functionality, but do not
require a irq_set_wake() callback. Instead of forcing an empty
callback to be implemented add a flag which notes this fact. Check for
the flag in set_irq_wake_real() and return success when set.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 3 insertions, 0 deletions

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 9b956fa20308..7e1a3ed1e61a 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -467,6 +467,9 @@ static int set_irq_wake_real(unsigned int irq, unsigned int on)
         struct irq_desc *desc = irq_to_desc(irq);
         int ret = -ENXIO;
 
+        if (irq_desc_get_chip(desc)->flags &  IRQCHIP_SKIP_SET_WAKE)
+                return 0;
+
         if (desc->irq_data.chip->irq_set_wake)
                 ret = desc->irq_data.chip->irq_set_wake(&desc->irq_data, on);