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path: root/drivers/s390/cio/ccwgroup.c
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Diffstat (limited to 'drivers/s390/cio/ccwgroup.c')
-rw-r--r--drivers/s390/cio/ccwgroup.c26
1 files changed, 22 insertions, 4 deletions
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index 731470e6849..84846c2b96d 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -65,10 +65,18 @@ static void __ccwgroup_remove_cdev_refs(struct ccwgroup_device *gdev)
}
}
-static int ccwgroup_set_online(struct ccwgroup_device *gdev)
+/**
+ * ccwgroup_set_online() - enable a ccwgroup device
+ * @gdev: target ccwgroup device
+ *
+ * This function attempts to put the ccwgroup device into the online state.
+ * Returns:
+ * %0 on success and a negative error value on failure.
+ */
+int ccwgroup_set_online(struct ccwgroup_device *gdev)
{
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
- int ret = 0;
+ int ret = -EINVAL;
if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
return -EAGAIN;
@@ -84,11 +92,20 @@ out:
atomic_set(&gdev->onoff, 0);
return ret;
}
+EXPORT_SYMBOL(ccwgroup_set_online);
-static int ccwgroup_set_offline(struct ccwgroup_device *gdev)
+/**
+ * ccwgroup_set_offline() - disable a ccwgroup device
+ * @gdev: target ccwgroup device
+ *
+ * This function attempts to put the ccwgroup device into the offline state.
+ * Returns:
+ * %0 on success and a negative error value on failure.
+ */
+int ccwgroup_set_offline(struct ccwgroup_device *gdev)
{
struct ccwgroup_driver *gdrv = to_ccwgroupdrv(gdev->dev.driver);
- int ret = 0;
+ int ret = -EINVAL;
if (atomic_cmpxchg(&gdev->onoff, 0, 1) != 0)
return -EAGAIN;
@@ -104,6 +121,7 @@ out:
atomic_set(&gdev->onoff, 0);
return ret;
}
+EXPORT_SYMBOL(ccwgroup_set_offline);
static ssize_t ccwgroup_online_store(struct device *dev,
struct device_attribute *attr,