linux-kernel - [PATCH 4.4 43/60] genirq: Delay incrementing interrupt count if its disabled/pending

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Date:   Thu, 13 Sep 2018 15:30:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Manoil Claudiu <claudiu.manoil@...escale.com>,
        Sudeep Holla <sudeep.holla@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Hanjun Guo <hanjun.guo@...aro.org>
Subject: [PATCH 4.4 43/60] genirq: Delay incrementing interrupt count if its disabled/pending

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sudeep Holla <sudeep.holla@....com>

commit a946e8c717f9355d1abd5408ed0adc0002d1aed1 upstream.

In case of a wakeup interrupt, irq_pm_check_wakeup disables the interrupt
and marks it pending and suspended, disables it and notifies the pm core
about the wake event. The interrupt gets handled later once the system
is resumed.

However the irq stats is updated twice: once when it's disabled waiting
for the system to resume and later when it's handled, resulting in wrong
counting of the wakeup interrupt when waking up the system.

This patch updates the interrupt count so that it's updated only when
the interrupt gets handled. It's already handled correctly in
handle_edge_irq and handle_edge_eoi_irq.

Reported-by: Manoil Claudiu <claudiu.manoil@...escale.com>
Signed-off-by: Sudeep Holla <sudeep.holla@....com>
Cc: Marc Zyngier <marc.zyngier@....com>
Link: http://lkml.kernel.org/r/1446661957-1019-1-git-send-email-sudeep.holla@arm.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/irq/chip.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -338,7 +338,6 @@ void handle_nested_irq(unsigned int irq)
 	raw_spin_lock_irq(&desc->lock);
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
-	kstat_incr_irqs_this_cpu(desc);
 
 	action = desc->action;
 	if (unlikely(!action || irqd_irq_disabled(&desc->irq_data))) {
@@ -346,6 +345,7 @@ void handle_nested_irq(unsigned int irq)
 		goto out_unlock;
 	}
 
+	kstat_incr_irqs_this_cpu(desc);
 	irqd_set(&desc->irq_data, IRQD_IRQ_INPROGRESS);
 	raw_spin_unlock_irq(&desc->lock);
 
@@ -412,13 +412,13 @@ void handle_simple_irq(struct irq_desc *
 		goto out_unlock;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
-	kstat_incr_irqs_this_cpu(desc);
 
 	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
 		desc->istate |= IRQS_PENDING;
 		goto out_unlock;
 	}
 
+	kstat_incr_irqs_this_cpu(desc);
 	handle_irq_event(desc);
 
 out_unlock:
@@ -462,7 +462,6 @@ void handle_level_irq(struct irq_desc *d
 		goto out_unlock;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
-	kstat_incr_irqs_this_cpu(desc);
 
 	/*
 	 * If its disabled or no action available
@@ -473,6 +472,7 @@ void handle_level_irq(struct irq_desc *d
 		goto out_unlock;
 	}
 
+	kstat_incr_irqs_this_cpu(desc);
 	handle_irq_event(desc);
 
 	cond_unmask_irq(desc);
@@ -532,7 +532,6 @@ void handle_fasteoi_irq(struct irq_desc
 		goto out;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
-	kstat_incr_irqs_this_cpu(desc);
 
 	/*
 	 * If its disabled or no action available
@@ -544,6 +543,7 @@ void handle_fasteoi_irq(struct irq_desc
 		goto out;
 	}
 
+	kstat_incr_irqs_this_cpu(desc);
 	if (desc->istate & IRQS_ONESHOT)
 		mask_irq(desc);