[Xen-devel] [PATCH 1/3] add flag IRQF_NO_SUSPEND in 'struct irqaction'

[Guanqun Lu <guanqun.lu@xxxxxxxxx>]

We currently only bypass IRQF_TIMER in '__disable_irq',
but Xen specific IRQs should not be disabled either.
This commit adds a new flag to accompolish this goal
without being mixed up with IRQF_TIMER flag.

Signed-off-by: Guanqun Lu <guanqun.lu@xxxxxxxxx>
---
 include/linux/interrupt.h |    1 +
 kernel/irq/manage.c       |    3 ++-
 2 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 8a9613d..8ad2b6f 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -58,6 +58,7 @@
 #define IRQF_PERCPU            0x00000400
 #define IRQF_NOBALANCING       0x00000800
 #define IRQF_IRQPOLL           0x00001000
+#define IRQF_NO_SUSPEND                0x00002000
 
 typedef irqreturn_t (*irq_handler_t)(int, void *);
 
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index 1516ab7..f814678 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -165,7 +165,8 @@ static inline int setup_affinity(unsigned int irq, struct 
irq_desc *desc)
 void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
 {
        if (suspend) {
-               if (!desc->action || (desc->action->flags & IRQF_TIMER))
+               if (!desc->action ||
+                   (desc->action->flags & (IRQF_TIMER | IRQF_NO_SUSPEND)))
                        return;
                desc->status |= IRQ_SUSPENDED;
        }
-- 
1.6.1.rc3


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