[PATCH v5 6/8] iommu/amd: Do not re-enable dev table entries in kdump

[Baoquan He <bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

This enabling should have been done in normal kernel. It's unnecessary
to enable it again in kdump kernel.

And clean up the function comments of init_device_table_dma.

Signed-off-by: Baoquan He <bhe-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
---
 drivers/iommu/amd_iommu_init.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 47a8fc9..8d5db2e 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1651,7 +1651,12 @@ static int __init amd_iommu_init_pci(void)
 	 */
 	ret = amd_iommu_init_api();
 
-	init_device_table_dma();
+	for_each_iommu(iommu) {
+		if ( !translation_pre_enabled(iommu) ) {
+			init_device_table_dma();
+			break;
+		}
+	}
 
 	for_each_iommu(iommu)
 		iommu_flush_all_caches(iommu);
@@ -1829,8 +1834,7 @@ static int __init init_memory_definitions(struct acpi_table_header *table)
 }
 
 /*
- * Init the device table to not allow DMA access for devices and
- * suppress all page faults
+ * Init the device table to not allow DMA access for devices.
  */
 static void init_device_table_dma(void)
 {
-- 
2.5.5