releases/4.8.5/irqchip-eznps-acknowledge-nps_ipi-before-calling-the-handler.patch

   1 From c0ca8df717061ae3d2ea624024033103c64210ae Mon Sep 17 00:00:00 2001
   2 From: Noam Camus <noamca@mellanox.com>
   3 Date: Thu, 13 Oct 2016 16:15:32 +0300
   4 Subject: irqchip/eznps: Acknowledge NPS_IPI before calling the handler
   5
   6 From: Noam Camus <noamca@mellanox.com>
   7
   8 commit c0ca8df717061ae3d2ea624024033103c64210ae upstream.
   9
  10 IPI_IRQ (also TIMER0_IRQ) should be acked before the action->handler is called
  11 in handle_percpu_devid_irq.
  12
  13 The IPI irq is edge sensitive and we might miss an IPI interrupt if it is
  14 triggered again while the handler runs.
  15
  16 Fixes: 44df427c894a ("irqchip: add nps Internal and external irqchips")
  17 Signed-off-by: Noam Camus <noamca@mellanox.com>
  18 Cc: marc.zyngier@arm.com
  19 Cc: jason@lakedaemon.net
  20 Link: http://lkml.kernel.org/r/1476364532-12634-1-git-send-email-noamca@mellanox.com
  21 Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
  22 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  23
  24 ---
  25  drivers/irqchip/irq-eznps.c |    4 ++--
  26  1 file changed, 2 insertions(+), 2 deletions(-)
  27
  28 --- a/drivers/irqchip/irq-eznps.c
  29 +++ b/drivers/irqchip/irq-eznps.c
  30 @@ -85,7 +85,7 @@ static void nps400_irq_eoi_global(struct
  31         nps_ack_gic();
  32  }
  33
  34 -static void nps400_irq_eoi(struct irq_data *irqd)
  35 +static void nps400_irq_ack(struct irq_data *irqd)
  36  {
  37         unsigned int __maybe_unused irq = irqd_to_hwirq(irqd);
  38
  39 @@ -103,7 +103,7 @@ static struct irq_chip nps400_irq_chip_p
  40         .name           = "NPS400 IC",
  41         .irq_mask       = nps400_irq_mask,
  42         .irq_unmask     = nps400_irq_unmask,
  43 -       .irq_eoi        = nps400_irq_eoi,
  44 +       .irq_ack        = nps400_irq_ack,
  45  };
  46
  47  static int nps400_irq_map(struct irq_domain *d, unsigned int virq,