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authorKenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>2007-08-22 19:53:30 +0900
committerTony Luck <tony.luck@intel.com>2007-08-28 16:03:06 -0700
commitf740e6c9c55cac6ab0a7d44a464b54467cca4f4f (patch)
tree915ce6c71163623ddb5dbbb09133e126007e6dfd
parent17764d2437b0c4440e0718205f2c26dbaa72bc27 (diff)
[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>
-rw-r--r--arch/ia64/kernel/setup.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index 407efea04bf..1f9b1d818dc 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