[Patch] IA64 Kdump don't clear vector in kexec_disable_iosapic

[Zou Nan hai <nanhai.zou@intel.com>]

Hi Tony,
	This patch is from Naoaki-san.
	Mask IOSAPIC will make the following EOI write to IOSAPIC fail because
IOSAPIC will not be able to find RTE entry.
        However move EOI write before IOSAPIC mask will leave a small
racy windows between them for interrupts. So mask IOSAPIC but leave the
vector field.

	The patch is against your test tree.

Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
       
--- linux-2.6/arch/ia64/kernel/iosapic.c	2006-10-25 14:37:30.000000000 +0800
+++ b/arch/ia64/kernel/iosapic.c	2006-10-25 14:41:34.000000000 +0800
@@ -303,7 +303,7 @@ kexec_disable_iosapic(void)
 				rte_list) {
 			iosapic_write(rte->addr,
 					IOSAPIC_RTE_LOW(rte->rte_index),
-					IOSAPIC_MASK);
+					IOSAPIC_MASK|vec);
 			iosapic_eoi(rte->addr, vec);
 		}
 	}