[PATCH 3/4] Revert "x86: disable IOMMUs on kernel crash"

From: Chris Wright
Date: Fri Apr 02 2010 - 21:29:31 EST

This effectively reverts commit 61d047be99757fd9b0af900d7abce9a13a337488.

Disabling the IOMMU can potetially allow DMA transactions to
complete without being translated. Leave it enabled, and allow
crash kernel to do the IOMMU reinitialization properly.

Cc: Joerg Roedel <joerg.roedel@xxxxxxx>
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Neil Horman <nhorman@xxxxxxxxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Signed-off-by: Chris Wright <chrisw@xxxxxxxxxxxx>
arch/x86/kernel/crash.c | 6 ------
1 file changed, 6 deletions(-)

--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -27,7 +27,6 @@
#include <asm/cpu.h>
#include <asm/reboot.h>
#include <asm/virtext.h>
-#include <asm/x86_init.h>

#if defined(CONFIG_SMP) && defined(CONFIG_X86_LOCAL_APIC)

@@ -103,10 +102,5 @@ void native_machine_crash_shutdown(struc
-#ifdef CONFIG_X86_64
- x86_platform.iommu_shutdown();
crash_save_cpu(regs, safe_smp_processor_id());

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