iommu/amd: Set global pointers to NULL after freeing them

Avoid any tries to double-free these pointers.

Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index a6b81a05a0d1..8cc507f96f3a 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -2114,18 +2114,22 @@ static void __init free_iommu_resources(void)
         kmemleak_free(irq_lookup_table);
         free_pages((unsigned long)irq_lookup_table,
                    get_order(rlookup_table_size));
+        irq_lookup_table = NULL;
 
         kmem_cache_destroy(amd_iommu_irq_cache);
         amd_iommu_irq_cache = NULL;
 
         free_pages((unsigned long)amd_iommu_rlookup_table,
                    get_order(rlookup_table_size));
+        amd_iommu_rlookup_table = NULL;
 
         free_pages((unsigned long)amd_iommu_alias_table,
                    get_order(alias_table_size));
+        amd_iommu_alias_table = NULL;
 
         free_pages((unsigned long)amd_iommu_dev_table,
                    get_order(dev_table_size));
+        amd_iommu_dev_table = NULL;
 
         free_iommu_all();
 
@@ -2195,6 +2199,7 @@ static void __init free_dma_resources(void)
 {
         free_pages((unsigned long)amd_iommu_pd_alloc_bitmap,
                    get_order(MAX_DOMAIN_ID/8));
+        amd_iommu_pd_alloc_bitmap = NULL;
 
         free_unity_maps();
 }