[ARM] 4589/1: ns9xxx: acknowledge IRQ_EXT2 in the demux routine for FPGA irqs

The FPGA on the a9m9750dev board interrupts the CPU via EXT2. So
to acknowledge any FPGA interrupt IRQ_EXT2 must be acknowledged.

Signed-off-by: Uwe Kleine-König <ukleinek@informatik.uni-freiburg.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 7 insertions, 2 deletions

diff --git a/arch/arm/mach-ns9xxx/board-a9m9750dev.c b/arch/arm/mach-ns9xxx/board-a9m9750dev.c
index 925048e7adfe..88d1f7ef78c9 100644
--- a/arch/arm/mach-ns9xxx/board-a9m9750dev.c
+++ b/arch/arm/mach-ns9xxx/board-a9m9750dev.c
@@ -70,15 +70,20 @@ static void a9m9750dev_fpga_demux_handler(unsigned int irq,
 {
         int stat = FPGA_ISR;
 
+        desc->chip->mask_ack(irq);
+
         while (stat != 0) {
                 int irqno = fls(stat) - 1;
+                struct irq_desc *fpgadesc;
 
                 stat &= ~(1 << irqno);
 
-                desc = irq_desc + FPGA_IRQ(irqno);
+                fpgadesc = irq_desc + FPGA_IRQ(irqno);
 
-                desc_handle_irq(FPGA_IRQ(irqno), desc);
+                desc_handle_irq(FPGA_IRQ(irqno), fpgadesc);
         }
+
+        desc->chip->unmask(irq);
 }
 
 void __init board_a9m9750dev_init_irq(void)