[IA64] Clear pending interrupts at CPU boot up time

The pending interrupts can be remaining at boot up time on some
platform. This will cause spurious interrupts when interrupt is
enabled for the first time. This patch clears IVR at the CPU
initialization to eliminate such spurious interrupts.

Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 407efea04bf5..1f9b1d818dcd 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -960,6 +960,11 @@ cpu_init (void)
 
         /* clear TPR & XTP to enable all interrupt classes: */
         ia64_setreg(_IA64_REG_CR_TPR, 0);
+
+        /* Clear any pending interrupts left by SAL/EFI */
+        while (ia64_get_ivr() != IA64_SPURIOUS_INT_VECTOR)
+                ia64_eoi();
+
 #ifdef CONFIG_SMP
         normal_xtp();
 #endif