1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index ebed2212778d..b24618b5362e 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -13,6 +13,7 @@
 #include <linux/errno.h>
 #include <linux/list.h>
 #include <linux/reboot.h>
+#include <asm/isc.h>
 
 #include "../s390mach.h"
 #include "css.h"
@@ -804,7 +805,8 @@ init_channel_subsystem (void)
                 goto out_pseudo;
         css_init_done = 1;
 
-        ctl_set_bit(6, 28);
+        /* Enable default isc for I/O subchannels. */
+        ctl_set_bit(6, 31 - IO_SCH_ISC);
 
         for_each_subchannel(__init_channel_subsystem, NULL);
         return 0;