http://bugs.gentoo.org/show_bug.cgi?id=232099
http://madwifi-project.org/changeset/3880

=== modified file 'include/compat.h'
--- include/compat.h	2009-01-31 16:01:16 +0000
+++ include/compat.h	2009-01-31 16:03:33 +0000
@@ -175,6 +175,10 @@
 #define DEV_ATH CTL_UNNUMBERED
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)
+#define request_module(_fmt, _modname) request_module(_modname)
+#endif
+
 #endif /* __KERNEL__ */
 
 #endif /* _ATH_COMPAT_H_ */

=== modified file 'net80211/ieee80211_linux.c'
--- net80211/ieee80211_linux.c	2009-01-31 16:01:16 +0000
+++ net80211/ieee80211_linux.c	2009-01-31 16:03:09 +0000
@@ -335,7 +335,7 @@
 {
 #ifdef CONFIG_KMOD
 	int rv;
-	rv = request_module(modname);
+	rv = request_module("%s", modname);
 	if (rv < 0)
 		printk(KERN_ERR "failed to automatically load module: %s; " \
 			"errno: %d\n", modname, rv);