[PATCH 5/7] MIPS: cevt-r4k: Don't handle IRQ if clockevent is not enabled

[Jiaxun Yang]

Some platforms may have shared Cause.TI, bailing out in IRQ handler
when clock event is not enabled can give another clock device a chance.

Signed-off-by: Jiaxun Yang <jiaxun.y...@flygoat.com>
---
 arch/mips/kernel/cevt-r4k.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/arch/mips/kernel/cevt-r4k.c b/arch/mips/kernel/cevt-r4k.c
index f0c52d751d0a..d396b1011fee 100644
--- a/arch/mips/kernel/cevt-r4k.c
+++ b/arch/mips/kernel/cevt-r4k.c
@@ -142,6 +142,15 @@ irqreturn_t c0_compare_interrupt(int irq, void *dev_id)
        if (handle_perf_irq(r2))
                return IRQ_HANDLED;
 
+       cd = &per_cpu(mips_clockevent_device, cpu);
+       /*
+        * If the clockevent have not enabled, then no need to check the rest.
+        * Some platforms may have shared Cause.TI, bailing out here can
+        * give another clock device a chance.
+        */
+       if (clockevent_state_detached(cd) || clockevent_state_shutdown(cd))
+               return IRQ_NONE;
+
        /*
         * The same applies to performance counter interrupts.  But with the
         * above we now know that the reason we got here must be a timer
@@ -150,7 +159,6 @@ irqreturn_t c0_compare_interrupt(int irq, void *dev_id)
        if (!r2 || (read_c0_cause() & CAUSEF_TI)) {
                /* Clear Count/Compare Interrupt */
                write_c0_compare(read_c0_compare());
-               cd = &per_cpu(mips_clockevent_device, cpu);
                cd->event_handler(cd);
 
                return IRQ_HANDLED;
-- 
2.28.0.rc1