arm/at91: Don't disable irqs in set_next_event and set_mode callbacks

on AT91 the timer irq is shared, so the handler might be entered without
irqs being disabled.  Though this should not happen as the timer irq is
registered early, there have been some reports on the mailing list.

To make debugging that problem easier next time it pops up a
WARN_ON_ONCE is added to the handler if irqs are not off.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

1 files changed, 6 insertions, 14 deletions

diff --git a/arch/arm/mach-at91/at91rm9200_time.c b/arch/arm/mach-at91/at91rm9200_time.c
index 309f3511aa20..2500f41d8d2d 100644
--- a/arch/arm/mach-at91/at91rm9200_time.c
+++ b/arch/arm/mach-at91/at91rm9200_time.c
@@ -58,6 +58,12 @@ static irqreturn_t at91rm9200_timer_interrupt(int irq, void *dev_id)
 {
         u32     sr = at91_sys_read(AT91_ST_SR) & irqmask;
 
+        /*
+         * irqs should be disabled here, but as the irq is shared they are only
+         * guaranteed to be off if the timer irq is registered first.
+         */
+        WARN_ON_ONCE(!irqs_disabled());
+
         /* simulate "oneshot" timer with alarm */
         if (sr & AT91_ST_ALMS) {
                 clkevt.event_handler(&clkevt);
@@ -132,24 +138,11 @@ clkevt32k_mode(enum clock_event_mode mode, struct clock_event_device *dev)
 static int
 clkevt32k_next_event(unsigned long delta, struct clock_event_device *dev)
 {
-        unsigned long   flags;
         u32             alm;
         int             status = 0;
 
         BUG_ON(delta < 2);
 
-        /* Use "raw" primitives so we behave correctly on RT kernels. */
-        raw_local_irq_save(flags);
-
-        /*
-         * According to Thomas Gleixner irqs are already disabled here.  Simply
-         * removing raw_local_irq_save above (and the matching
-         * raw_local_irq_restore) was not accepted.  See
-         * http://thread.gmane.org/gmane.linux.ports.arm.kernel/41174
-         * So for now (2008-11-20) just warn once if irqs were not disabled ...
-         */
-        WARN_ON_ONCE(!raw_irqs_disabled_flags(flags));
-
         /* The alarm IRQ uses absolute time (now+delta), not the relative
          * time (delta) in our calling convention.  Like all clockevents
          * using such "match" hardware, we have a race to defend against.
@@ -169,7 +162,6 @@ clkevt32k_next_event(unsigned long delta, struct clock_event_device *dev)
         alm += delta;
         at91_sys_write(AT91_ST_RTAR, alm);
 
-        raw_local_irq_restore(flags);
         return status;
 }