irqchip: vic: Properly chain the cascaded IRQs

We are flagging the parent IRQ as chained, then we must also
make sure to call the chained_irq_[enter|exit] functions for
things to work smoothly.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: http://lkml.kernel.org/r/1397550484-7119-1-git-send-email-linus.walleij@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/drivers/irqchip/irq-vic.c b/drivers/irqchip/irq-vic.c
index 37dab0b..7d35287 100644 (file)
--- a/drivers/irqchip/irq-vic.c
+++ b/drivers/irqchip/irq-vic.c
@@ -24,6 +24,7 @@
 #include <linux/list.h>
 #include <linux/io.h>
 #include <linux/irq.h>
+#include <linux/irqchip/chained_irq.h>
 #include <linux/irqdomain.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
@@ -228,12 +229,17 @@ static int handle_one_vic(struct vic_device *vic, struct pt_regs *regs)
 static void vic_handle_irq_cascaded(unsigned int irq, struct irq_desc *desc)
 {
        u32 stat, hwirq;
+       struct irq_chip *host_chip = irq_desc_get_chip(desc);
        struct vic_device *vic = irq_desc_get_handler_data(desc);
 
+       chained_irq_enter(host_chip, desc);
+
        while ((stat = readl_relaxed(vic->base + VIC_IRQ_STATUS))) {
                hwirq = ffs(stat) - 1;
                generic_handle_irq(irq_find_mapping(vic->domain, hwirq));
        }
+
+       chained_irq_exit(host_chip, desc);
 }
 
 /*