diff -Nurp build.old/mst_pciconf.c build/mst_pciconf.c
--- build.old/mst_pciconf.c	2022-06-05 00:39:37.000000000 +0200
+++ build/mst_pciconf.c	2022-06-05 00:57:29.857473193 +0200
@@ -598,7 +598,11 @@ static void close_dma(struct dev_data* d
     int i = 0;
     for (i = 0; i < MST_DMA_END; i++) {
         if (dev->dma_props[i].mem_pa) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(5,18,0)
             pci_unmap_single(dev->pci_dev, dev->dma_props[i].dma_map, DMA_MBOX_SIZE, DMA_BIDIRECTIONAL);
+#else
+            dma_unmap_single(&dev->pci_dev->dev, dev->dma_props[i].dma_map, DMA_MBOX_SIZE, DMA_BIDIRECTIONAL);
+#endif
             kfree(dev->dma_props[i].mem_pa);
             dev->dma_props[i].mem_pa = NULL;
         }