--- src.drv/defs.h~	2006-05-18 16:18:08.525808536 +0200
+++ src.drv/defs.h	2006-05-18 18:57:07.000000000 +0200
@@ -85,7 +85,7 @@
 #define CONFIG_ISAPNP
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 4, 23)
 typedef void irqreturn_t;
 
 #define IRQ_NONE