linux-kernel - [PATCH 4.8 111/140] irqchip/eznps: Acknowledge NPS

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Date:   Wed, 26 Oct 2016 14:22:51 +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, Noam Camus <noamca@...lanox.com>,
        marc.zyngier@....com, jason@...edaemon.net,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 4.8 111/140] irqchip/eznps: Acknowledge NPS_IPI before calling the handler

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

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

From: Noam Camus <noamca@...lanox.com>

commit c0ca8df717061ae3d2ea624024033103c64210ae upstream.

IPI_IRQ (also TIMER0_IRQ) should be acked before the action->handler is called
in handle_percpu_devid_irq.

The IPI irq is edge sensitive and we might miss an IPI interrupt if it is
triggered again while the handler runs.

Fixes: 44df427c894a ("irqchip: add nps Internal and external irqchips")
Signed-off-by: Noam Camus <noamca@...lanox.com>
Cc: marc.zyngier@....com
Cc: jason@...edaemon.net
Link: http://lkml.kernel.org/r/1476364532-12634-1-git-send-email-noamca@mellanox.com
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/irqchip/irq-eznps.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/irqchip/irq-eznps.c
+++ b/drivers/irqchip/irq-eznps.c
@@ -85,7 +85,7 @@ static void nps400_irq_eoi_global(struct
 	nps_ack_gic();
 }
 
-static void nps400_irq_eoi(struct irq_data *irqd)
+static void nps400_irq_ack(struct irq_data *irqd)
 {
 	unsigned int __maybe_unused irq = irqd_to_hwirq(irqd);
 
@@ -103,7 +103,7 @@ static struct irq_chip nps400_irq_chip_p
 	.name		= "NPS400 IC",
 	.irq_mask	= nps400_irq_mask,
 	.irq_unmask	= nps400_irq_unmask,
-	.irq_eoi	= nps400_irq_eoi,
+	.irq_ack	= nps400_irq_ack,
 };
 
 static int nps400_irq_map(struct irq_domain *d, unsigned int virq,