Revert "iommu/amd: Flush not present cache in iommu_map_page"

This reverts commit 1a107901.

This commit caused a NULL-ptr deference bug and must be
reverted for now.
Signed-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd_iommu.c

@@ -1307,16 +1307,6 @@ static void domain_flush_complete(struct protection_domain *domain)
 	}
 }
 
-/* Flush the not present cache if it exists */
-static void domain_flush_np_cache(struct protection_domain *domain,
-		dma_addr_t iova, size_t size)
-{
-	if (unlikely(amd_iommu_np_cache)) {
-		domain_flush_pages(domain, iova, size);
-		domain_flush_complete(domain);
-	}
-}
-
 
 /*
  * This function flushes the DTEs for all devices in domain
@@ -2399,7 +2389,10 @@ static dma_addr_t __map_single(struct device *dev,
 	}
 	address += offset;
 
-	domain_flush_np_cache(&dma_dom->domain, address, size);
+	if (unlikely(amd_iommu_np_cache)) {
+		domain_flush_pages(&dma_dom->domain, address, size);
+		domain_flush_complete(&dma_dom->domain);
+	}
 
 out:
 	return address;
@@ -2578,8 +2571,6 @@ static int map_sg(struct device *dev, struct scatterlist *sglist,
 		s->dma_length   = s->length;
 	}
 
-	domain_flush_np_cache(domain, s->dma_address, s->dma_length);
-
 	return nelems;
 
 out_unmap:
@@ -3060,8 +3051,6 @@ static int amd_iommu_map(struct iommu_domain *dom, unsigned long iova,
 	ret = iommu_map_page(domain, iova, paddr, page_size, prot, GFP_KERNEL);
 	mutex_unlock(&domain->api_lock);
 
-	domain_flush_np_cache(domain, iova, page_size);
-
 	return ret;
 }