[PATCH 07/13] Implement arch disable/enable irq hooks.

[Scott Wood]

These hooks ensure that a decrementer interrupt is not pending when
suspending; otherwise, problems may occur.  For example, with deep sleep
on the 831x, a pending decrementer will cause a system freeze because the
SoC thinks the decrementer interrupt would have woken the system, but the
core must have interrupts disabled due to the setup required for deep
sleep.

Signed-off-by: Scott Wood <scottwood at freescale.com>
---
 arch/powerpc/kernel/time.c |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index 7cedef8..46546a3 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -707,6 +707,29 @@ void wakeup_decrementer(void)
 	set_dec(ticks);
 }
 
+/* Overrides the weak version in kernel/power/main.c */
+void arch_suspend_disable_irqs(void)
+{
+	preempt_disable();
+
+	/* Disable the decrementer, so that it doesn't interfere
+	 * with suspending.
+	 */
+
+	set_dec(0x7fffffff);
+	local_irq_disable();
+	set_dec(0x7fffffff);
+}
+
+/* Overrides the weak version in kernel/power/main.c */
+void arch_suspend_enable_irqs(void)
+{
+	wakeup_decrementer();
+
+	local_irq_enable();
+	preempt_enable();
+}
+
 #ifdef CONFIG_SMP
 void __init smp_space_timers(unsigned int max_cpus)
 {
-- 
1.5.0.3