irq_gc_mask_disable_reg_and_ack() is not equivalent to
irq_gc_mask_disable_reg() and irq_gc_ack_set_bit().

Leave the irq_mask_ack callback undefined, and let the irqchip
framework use irq_mask and irq_ack instead.

Reported-by: Doug Berger <opendmb@gmail.com>
Fixes: 4bba66899ac6 ("irqchip/tango: Add support for Sigma Designs SMP86xx/SMP87xx interrupt controller")
Signed-off-by: Marc Gonzalez <redacted>
Cc: stable at vger.kernel.org
---
As discussed previously, it is acceptable for tango to rely
on mask_ack_irq() doing the right thing(TM).
---
 drivers/irqchip/irq-tango.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/irqchip/irq-tango.c b/drivers/irqchip/irq-tango.c
index bdbb5c0ff7fe..825085cdab99 100644
--- a/drivers/irqchip/irq-tango.c
+++ b/drivers/irqchip/irq-tango.c

@@ -141,7 +141,6 @@ static void __init tangox_irq_init_chip(struct irq_chip_generic *gc,
 	for (i = 0; i < 2; i++) {
 		ct[i].chip.irq_ack = irq_gc_ack_set_bit;
 		ct[i].chip.irq_mask = irq_gc_mask_disable_reg;
-		ct[i].chip.irq_mask_ack = irq_gc_mask_disable_reg_and_ack;
 		ct[i].chip.irq_unmask = irq_gc_unmask_enable_reg;
 		ct[i].chip.irq_set_type = tangox_irq_set_type;
 		ct[i].chip.name = gc->domain->name;

-- 
2.11.0