[patch RFC 35/38] platform-msi: Provide default irq_chip::ack

[Thomas Gleixner <tglx@xxxxxxxxxxxxx>]

For the upcoming device MSI support it's required to have a default
irq_chip::ack implementation (irq_chip_ack_parent) so the drivers do not
need to care.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/base/platform-msi.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -95,6 +95,8 @@ static void platform_msi_update_chip_ops
                chip->irq_mask = irq_chip_mask_parent;
        if (!chip->irq_unmask)
                chip->irq_unmask = irq_chip_unmask_parent;
+       if (!chip->irq_ack)
+               chip->irq_ack = irq_chip_ack_parent;
        if (!chip->irq_eoi)
                chip->irq_eoi = irq_chip_eoi_parent;
        if (!chip->irq_set_affinity)