It seems this patch got dropped (it was in addition to the `s390:
improve response code handling in chsc_enable_facility()' patch).
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
                /* -ENXIO: no more subchannels. */
                case -ENXIO:
                        return ret;
+               /* -EIO: this subchannel set not supported. */
+               case -EIO:
+                       return ret;
                default:
                        return 0;
                }