diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index ad34a20..484b6a3 100644
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -2364,7 +2364,6 @@
 
 static void mxser_release_ISA_res(struct mxser_board *brd)
 {
-	free_irq(brd->irq, brd);
 	release_region(brd->ports[0].ioaddr, 8 * brd->info->nports);
 	mxser_release_vector(brd);
 }
@@ -2430,6 +2429,7 @@
 		tty_unregister_device(mxvar_sdriver, brd->idx + i);
 		tty_port_destroy(&brd->ports[i].port);
 	}
+	free_irq(brd->irq, brd);
 }
 
 static int __init mxser_get_ISA_conf(int cap, struct mxser_board *brd)
@@ -2554,6 +2554,7 @@
 	struct mxser_board *brd;
 	unsigned int i, j;
 	unsigned long ioaddress;
+	struct device *tty_dev;
 	int retval = -EINVAL;
 
 	for (i = 0; i < MXSER_BOARDS; i++)
@@ -2637,13 +2638,25 @@
 	if (retval)
 		goto err_rel3;
 
-	for (i = 0; i < brd->info->nports; i++)
-		tty_port_register_device(&brd->ports[i].port, mxvar_sdriver,
-				brd->idx + i, &pdev->dev);
+	for (i = 0; i < brd->info->nports; i++) {
+		tty_dev = tty_port_register_device(&brd->ports[i].port,
+				mxvar_sdriver, brd->idx + i, &pdev->dev);
+		if (IS_ERR(tty_dev)) {
+			retval = PTR_ERR(tty_dev);
+			for (i--; i >= 0; i--)
+				tty_unregister_device(mxvar_sdriver,
+					brd->idx + i);
+			goto err_relbrd;
+		}
+	}
 
 	pci_set_drvdata(pdev, brd);
 
 	return 0;
+err_relbrd:
+	for (i = 0; i < brd->info->nports; i++)
+		tty_port_destroy(&brd->ports[i].port);
+	free_irq(brd->irq, brd);
 err_rel3:
 	pci_release_region(pdev, 3);
 err_zero:
@@ -2665,7 +2678,6 @@
 
 	mxser_board_remove(brd);
 
-	free_irq(pdev->irq, brd);
 	pci_release_region(pdev, 2);
 	pci_release_region(pdev, 3);
 	pci_disable_device(pdev);
@@ -2683,6 +2695,7 @@
 static int __init mxser_module_init(void)
 {
 	struct mxser_board *brd;
+	struct device *tty_dev;
 	unsigned int b, i, m;
 	int retval;
 
@@ -2728,14 +2741,29 @@
 
 		/* mxser_initbrd will hook ISR. */
 		if (mxser_initbrd(brd, NULL) < 0) {
+			mxser_release_ISA_res(brd);
 			brd->info = NULL;
 			continue;
 		}
 
 		brd->idx = m * MXSER_PORTS_PER_BOARD;
-		for (i = 0; i < brd->info->nports; i++)
-			tty_port_register_device(&brd->ports[i].port,
+		for (i = 0; i < brd->info->nports; i++) {
+			tty_dev = tty_port_register_device(&brd->ports[i].port,
 					mxvar_sdriver, brd->idx + i, NULL);
+			if (IS_ERR(tty_dev)) {
+				for (i--; i >= 0; i--)
+					tty_unregister_device(mxvar_sdriver,
+						brd->idx + i);
+				for (i = 0; i < brd->info->nports; i++)
+					tty_port_destroy(&brd->ports[i].port);
+				free_irq(brd->irq, brd);
+				mxser_release_ISA_res(brd);
+				brd->info = NULL;
+				break;
+			}
+		}
+		if (brd->info == NULL)
+			continue;
 
 		m++;
 	}