[Xen-devel] [PATCH 1/2] irq: adjust state of irq in resume_irq() when IRQF_FORCE_RESUME set

[Juergen Gross <jgross@xxxxxxxx>]

An irq pretending it got disabled should have its state set
accordingly. Otherwise a potential unmask later won't succeed.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 kernel/irq/chip.c      | 10 ----------
 kernel/irq/internals.h | 10 ++++++++++
 kernel/irq/pm.c        |  2 ++
 3 files changed, 12 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);
diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
index dbfba9933ed2..a2c48058354c 100644
--- a/kernel/irq/internals.h
+++ b/kernel/irq/internals.h
@@ -227,6 +227,16 @@ static inline bool irqd_has_set(struct irq_data *d, 
unsigned int mask)
        return __irqd_to_state(d) & mask;
 }
 
+static inline void irq_state_set_disabled(struct irq_desc *desc)
+{
+       irqd_set(&desc->irq_data, IRQD_IRQ_DISABLED);
+}
+
+static inline void irq_state_set_masked(struct irq_desc *desc)
+{
+       irqd_set(&desc->irq_data, IRQD_IRQ_MASKED);
+}
+
 #undef __irqd_to_state
 
 static inline void kstat_incr_irqs_this_cpu(struct irq_desc *desc)
diff --git a/kernel/irq/pm.c b/kernel/irq/pm.c
index cea1de0161f1..6bd9b58429cc 100644
--- a/kernel/irq/pm.c
+++ b/kernel/irq/pm.c
@@ -149,6 +149,8 @@ static void resume_irq(struct irq_desc *desc)
 
        /* Pretend that it got disabled ! */
        desc->depth++;
+       irq_state_set_disabled(desc);
+       irq_state_set_masked(desc);
 resume:
        desc->istate &= ~IRQS_SUSPENDED;
        __enable_irq(desc);
-- 
2.12.3


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