diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c
index 672d973..0b3c310 100644
--- a/drivers/s390/cio/chp.c
+++ b/drivers/s390/cio/chp.c
@@ -95,6 +95,7 @@
 	}
 	return opm;
 }
+EXPORT_SYMBOL_GPL(chp_get_sch_opm);
 
 /**
  * chp_is_registered - check if a channel-path is registered
diff --git a/drivers/s390/cio/cio.c b/drivers/s390/cio/cio.c
index fdb164f..be53f0e 100644
--- a/drivers/s390/cio/cio.c
+++ b/drivers/s390/cio/cio.c
@@ -387,8 +387,10 @@
 	return ret;
 }
 
-/*
- * Enable subchannel.
+/**
+ * cio_enable_subchannel - enable a subchannel.
+ * @sch: subchannel to be enabled
+ * @intparm: interruption parameter to set
  */
 int cio_enable_subchannel(struct subchannel *sch, u32 intparm)
 {
@@ -434,12 +436,13 @@
 	CIO_TRACE_EVENT (2, dbf_txt);
 	return ret;
 }
+EXPORT_SYMBOL_GPL(cio_enable_subchannel);
 
-/*
- * Disable subchannel.
+/**
+ * cio_disable_subchannel - disable a subchannel.
+ * @sch: subchannel to disable
  */
-int
-cio_disable_subchannel (struct subchannel *sch)
+int cio_disable_subchannel(struct subchannel *sch)
 {
 	char dbf_txt[15];
 	int ccode;
@@ -484,6 +487,7 @@
 	CIO_TRACE_EVENT (2, dbf_txt);
 	return ret;
 }
+EXPORT_SYMBOL_GPL(cio_disable_subchannel);
 
 int cio_create_sch_lock(struct subchannel *sch)
 {
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index cf9d27c..bc3a8e4 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -158,12 +158,17 @@
 	return ret;
 }
 
+/**
+ * css_sch_device_unregister - unregister a subchannel
+ * @sch: subchannel to be unregistered
+ */
 void css_sch_device_unregister(struct subchannel *sch)
 {
 	mutex_lock(&sch->reg_mutex);
 	device_unregister(&sch->dev);
 	mutex_unlock(&sch->reg_mutex);
 }
+EXPORT_SYMBOL_GPL(css_sch_device_unregister);
 
 static void ssd_from_pmcw(struct chsc_ssd_info *ssd, struct pmcw *pmcw)
 {