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Subject[PATCH 4.8 111/140] irqchip/eznps: Acknowledge NPS_IPI before calling the handler
Date
4.8-stable review patch.  If anyone has any objections, please let me know.

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

From: Noam Camus <noamca@mellanox.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@mellanox.com>
Cc: marc.zyngier@arm.com
Cc: jason@lakedaemon.net
Link: http://lkml.kernel.org/r/1476364532-12634-1-git-send-email-noamca@mellanox.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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,

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