Exclude i2o_scsi driver.

This kernel module is dangerous to load here.  It is meant only to allow direct
access to SCSI disks, which can destroy data.  The i2o_block driver gives you
access to the defined hardware RAID arrays.

dracut-functions

@@ -280,6 +280,10 @@ instmods() {
 		fi
 		;;
 	    --*) mpargs+=" $mod";;
+            i2o_scsi)
+                    # Must never run this diagnostic-only module
+                    shift; continue;
+                ;;
 	    *)  mod=${mod##*/}
 	        # if we are already installed, skip this module and go on
 	        # to the next one.