diff --git a/drivers/s390/net/ism_drv.c b/drivers/s390/net/ism_drv.c
index d99c588d3e00..242da20f27e0 100644
--- a/drivers/s390/net/ism_drv.c
+++ b/drivers/s390/net/ism_drv.c
@@ -148,13 +148,16 @@ static int unregister_sba(struct ism_dev *ism)
 	if (ret && ret != ISM_ERROR)
 		return -EIO;
 
+	return 0;
+}
+
+static void ism_free_sba(struct ism_dev *ism)
+{
 	dma_free_coherent(&ism->pdev->dev, PAGE_SIZE,
 			  ism->sba, ism->sba_dma_addr);
 
 	ism->sba = NULL;
 	ism->sba_dma_addr = 0;
-
-	return 0;
 }
 
 static int unregister_ieq(struct ism_dev *ism)
@@ -168,13 +171,16 @@ static int unregister_ieq(struct ism_dev *ism)
 	if (ret && ret != ISM_ERROR)
 		return -EIO;
 
+	return 0;
+}
+
+static void ism_free_ieq(struct ism_dev *ism)
+{
 	dma_free_coherent(&ism->pdev->dev, PAGE_SIZE,
 			  ism->ieq, ism->ieq_dma_addr);
 
 	ism->ieq = NULL;
 	ism->ieq_dma_addr = 0;
-
-	return 0;
 }
 
 static int ism_read_local_gid(struct dibs_dev *dibs)
@@ -573,6 +579,7 @@ static int ism_dev_init(struct ism_dev *ism)
 
 unreg_sba:
 	unregister_sba(ism);
+	ism_free_sba(ism);
 free_irq:
 	free_irq(pci_irq_vector(pdev, 0), ism);
 free_vectors:
@@ -585,9 +592,13 @@ static void ism_dev_exit(struct ism_dev *ism)
 {
 	struct pci_dev *pdev = ism->pdev;
 
+	/* ism will only generate new IRQs while ieq & sba are registered */
 	unregister_ieq(ism);
 	unregister_sba(ism);
+	/* drain ongoing irpt handlers */
 	free_irq(pci_irq_vector(pdev, 0), ism);
+	ism_free_ieq(ism);
+	ism_free_sba(ism);
 	pci_free_irq_vectors(pdev);
 }