--- linux-2.4.7-pre3/drivers/char/sonypi.c	Sat Jul  7 18:00:12 2001
+++ linux/drivers/char/sonypi.c	Sat Jul  7 18:00:28 2001
@@ -690,7 +690,11 @@
 };
 
 static int __init sonypi_init_module(void) {
-	return pci_module_init(&sonypi_driver);
+	if (pci_find_subsys(PCI_ANY_ID, PCI_ANY_ID,
+			    PCI_VENDOR_ID_SONY, PCI_ANY_ID, NULL) != NULL)
+		return pci_module_init(&sonypi_driver);
+	else
+		return -ENODEV;
 }
 
 static void __exit sonypi_cleanup_module(void) {