[PATCH 08/12] Revert "x86: disable IOMMUs on kernel crash"

From: Joerg Roedel
Date: Wed Apr 07 2010 - 08:49:45 EST

From: Chris Wright <chrisw@xxxxxxxxxxxx>

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: stable@xxxxxxxxxx
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>
Signed-off-by: Joerg Roedel <joerg.roedel@xxxxxxx>
arch/x86/kernel/crash.c | 6 ------
1 files changed, 0 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index a4849c1..ebd4c51 100644
--- 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(struct pt_regs *regs)
-#ifdef CONFIG_X86_64
- x86_platform.iommu_shutdown();
crash_save_cpu(regs, safe_smp_processor_id());

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/