s390/cio: export real cssid

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 8b608e0d2d26860dfaed5b5f38ad82706d3818b5..8faffed610922c5bc3f37b6dc01cef3d3f4259bc 100644 (file)
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -722,6 +722,18 @@ static void channel_subsystem_release(struct device *dev)
        kfree(css);
 }
 
+static ssize_t real_cssid_show(struct device *dev, struct device_attribute *a,
+                              char *buf)
+{
+       struct channel_subsystem *css = to_css(dev);
+
+       if (css->cssid < 0)
+               return -EINVAL;
+
+       return sprintf(buf, "%x\n", css->cssid);
+}
+static DEVICE_ATTR_RO(real_cssid);
+
 static ssize_t cm_enable_show(struct device *dev, struct device_attribute *a,
                              char *buf)
 {
@@ -766,6 +778,15 @@ static umode_t cm_enable_mode(struct kobject *kobj, struct attribute *attr,
        return css_chsc_characteristics.secm ? attr->mode : 0;
 }
 
+static struct attribute *cssdev_attrs[] = {
+       &dev_attr_real_cssid.attr,
+       NULL,
+};
+
+static struct attribute_group cssdev_attr_group = {
+       .attrs = cssdev_attrs,
+};
+
 static struct attribute *cssdev_cm_attrs[] = {
        &dev_attr_cm_enable.attr,
        NULL,
@@ -777,6 +798,7 @@ static struct attribute_group cssdev_cm_attr_group = {
 };
 
 static const struct attribute_group *cssdev_attr_groups[] = {
+       &cssdev_attr_group,
        &cssdev_cm_attr_group,
        NULL,
 };