ARM: OMAP: Fix spinlock recursion for dyntick

Fix spinlock recursion for dyntick. Modified version based
on Imre Deak's earlier patch.

Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 20 insertions, 6 deletions

diff --git a/arch/arm/plat-omap/timer32k.c b/arch/arm/plat-omap/timer32k.c
index f7b4e89de518..cf6df3378d37 100644
--- a/arch/arm/plat-omap/timer32k.c
+++ b/arch/arm/plat-omap/timer32k.c
@@ -194,14 +194,11 @@ unsigned long long sched_clock(void)
  * issues with dynamic tick. In the dynamic tick case, we need to lock
  * with irqsave.
  */
-static irqreturn_t omap_32k_timer_interrupt(int irq, void *dev_id,
-                                            struct pt_regs *regs)
+static inline irqreturn_t _omap_32k_timer_interrupt(int irq, void *dev_id,
+                                        struct pt_regs *regs)
 {
-        unsigned long flags;
         unsigned long now;
 
-        write_seqlock_irqsave(&xtime_lock, flags);
-
         omap_32k_timer_ack_irq();
         now = omap_32k_sync_timer_read();
 
@@ -217,6 +214,23 @@ static irqreturn_t omap_32k_timer_interrupt(int irq, void *dev_id,
          * continuous timer can be overridden from pm_idle to be longer.
          */
         omap_32k_timer_start(omap_32k_last_tick + OMAP_32K_TICKS_PER_HZ - now);
+
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t omap_32k_timer_handler(int irq, void *dev_id,
+                                        struct pt_regs *regs)
+{
+        return _omap_32k_timer_interrupt(irq, dev_id, regs);
+}
+
+static irqreturn_t omap_32k_timer_interrupt(int irq, void *dev_id,
+                                            struct pt_regs *regs)
+{
+        unsigned long flags;
+
+        write_seqlock_irqsave(&xtime_lock, flags);
+        _omap_32k_timer_interrupt(irq, dev_id, regs);
         write_sequnlock_irqrestore(&xtime_lock, flags);
 
         return IRQ_HANDLED;
@@ -262,7 +276,7 @@ static struct dyn_tick_timer omap_dyn_tick_timer = {
         .enable         = omap_32k_timer_enable_dyn_tick,
         .disable        = omap_32k_timer_disable_dyn_tick,
         .reprogram      = omap_32k_timer_reprogram,
-        .handler        = omap_32k_timer_interrupt,
+        .handler        = omap_32k_timer_handler,
 };
 #endif  /* CONFIG_NO_IDLE_HZ */