irqchip/armada-370-xp: Use PCI_MSI_DOORBELL_START where appropriate

As suggested by Gregory Clement, this commit adjusts the
irq-armada-370-xp driver to use the PCI_MSI_DOORBELL_START define in
the armada_370_xp_handle_msi_irq() function, rather than hardcoding
its value.

Suggested-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Link: https://lkml.kernel.org/r/1455115621-22846-4-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/irqchip/irq-armada-370-xp.c b/drivers/irqchip/irq-armada-370-xp.c
index e5738c5d7a6c..f53eb716eccb 100644
--- a/drivers/irqchip/irq-armada-370-xp.c
+++ b/drivers/irqchip/irq-armada-370-xp.c
@@ -401,10 +401,10 @@ static void armada_370_xp_handle_msi_irq(struct pt_regs *regs, bool is_chained)
 
                 if (is_chained) {
                         irq = irq_find_mapping(armada_370_xp_msi_inner_domain,
-                                               msinr - 16);
+                                               msinr - PCI_MSI_DOORBELL_START);
                         generic_handle_irq(irq);
                 } else {
-                        irq = msinr - 16;
+                        irq = msinr - PCI_MSI_DOORBELL_START;
                         handle_domain_irq(armada_370_xp_msi_inner_domain,
                                           irq, regs);
                 }