From: Santosh Shilimkar <santosh.shilimkar@ti.com>
Date: Fri, 9 Sep 2011 08:29:35 +0000 (+0530)
Subject: genirq: Add IRQCHIP_SKIP_SET_WAKE flag
X-Git-Tag: firefly_0821_release~3680^2~4308^2~4
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=60f96b41f71d2a13d1c0a457b8b77958f77142d1;p=firefly-linux-kernel-4.4.55.git

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>
---

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 59517300a315..73e31abeba1c 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -336,12 +336,14 @@ struct irq_chip {
  * IRQCHIP_MASK_ON_SUSPEND:	Mask non wake irqs in the suspend path
  * IRQCHIP_ONOFFLINE_ENABLED:	Only call irq_on/off_line callbacks
  *				when irq enabled
+ * IRQCHIP_SKIP_SET_WAKE:	Skip chip.irq_set_wake(), for this irq chip
  */
 enum {
 	IRQCHIP_SET_TYPE_MASKED		= (1 <<  0),
 	IRQCHIP_EOI_IF_HANDLED		= (1 <<  1),
 	IRQCHIP_MASK_ON_SUSPEND		= (1 <<  2),
 	IRQCHIP_ONOFFLINE_ENABLED	= (1 <<  3),
+	IRQCHIP_SKIP_SET_WAKE		= (1 <<  4),
 };
 
 /* This include will go away once we isolated irq_desc usage to core code */
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);