diff -ur linux.vanilla/drivers/char/serial.c linux/drivers/char/serial.c
--- linux.vanilla/drivers/char/serial.c	Thu Feb 22 20:50:18 2001
+++ linux/drivers/char/serial.c	Thu Feb 22 23:01:48 2001
@@ -3876,7 +3876,8 @@
 		return 0;
 	}
 	req->io_type = SERIAL_IO_MEM;
-	req->iomem_base = ioremap(port, board->uart_offset);
+	if ((req->iomem_base = ioremap(port, board->uart_offset)) == NULL)
+		return 1;
 	req->iomem_reg_shift = board->reg_shift;
 	req->port = 0;
 	return 0;
@@ -4010,7 +4011,8 @@
 				      data | pci_config);
 	
 	/* enable/disable interrupts */
-	p = ioremap(pci_resource_start(dev, 0), 0x80);
+	if ((p = ioremap(pci_resource_start(dev, 0), 0x80)) == NULL)
+		return 1;
 	writel(enable ? irq_config : 0x00, (unsigned long)p + 0x4c);
 	iounmap(p);
 
@@ -4053,7 +4055,8 @@
 
        if (!enable) return 0;
 
-       p = ioremap(pci_resource_start(dev, 0), 0x80);
+       if ((p = ioremap(pci_resource_start(dev, 0), 0x80)) == NULL)
+		return 1;
 
        switch (dev->device & 0xfff8) {
                case PCI_DEVICE_ID_SIIG_1S_10x:         /* 1S */