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iommu/amd: Disable iommu only if amd_iommu=off is specified 

It's ok to disable iommu early in normal kernel or in kdump kernel when
amd_iommu=off is specified. While we should not disable it in kdump kernel
when on-flight dma is still on-going.

Signed-off-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Baoquan He 2017-08-09 16:33:44 +08:00 committed by Joerg Roedel
parent daae2d25a4
commit 20b46dff13
1 changed files with 2 additions and 1 deletions
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3
drivers/iommu/amd_iommu_init.c
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@ -2499,7 +2499,8 @@ static int __init early_amd_iommu_init(void)
goto out;
/* Disable any previously enabled IOMMUs */
disable_iommus();
if (!is_kdump_kernel() || amd_iommu_disabled)
disable_iommus();
if (amd_iommu_irq_remap)
amd_iommu_irq_remap = check_ioapic_information();