diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 1ec38701a7f5..938c959ab19e 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -930,7 +930,9 @@ EXPORT_SYMBOL_GPL(is_swiotlb_active);
 
 static int io_tlb_used_get(void *data, u64 *val)
 {
-	*val = mem_used(&io_tlb_default_mem);
+	struct io_tlb_mem *mem = data;
+
+	*val = mem_used(mem);
 	return 0;
 }
 DEFINE_DEBUGFS_ATTRIBUTE(fops_io_tlb_used, io_tlb_used_get, NULL, "%llu\n");
@@ -943,7 +945,7 @@ static void swiotlb_create_debugfs_files(struct io_tlb_mem *mem,
 		return;
 
 	debugfs_create_ulong("io_tlb_nslabs", 0400, mem->debugfs, &mem->nslabs);
-	debugfs_create_file("io_tlb_used", 0400, mem->debugfs, NULL,
+	debugfs_create_file("io_tlb_used", 0400, mem->debugfs, mem,
 			&fops_io_tlb_used);
 }