Fix missing prototypes by including <linux/interrupt.h>.

index fb53eea..d8a7260 100644
@@ -78,8 +78,8 @@
 #include <linux/string.h>
 #include <linux/delay.h>
 #include <linux/init.h>
+#include <linux/interrupt.h>
 #include <linux/blkdev.h>
-#include <asm/irq.h>
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>