[S390] Use dev->groups for adding/removing the subchannel attribute group.

Signed-off-by: NCornelia Huck <cornelia.huck@de.ibm.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

drivers/s390/cio/css.c

@@ -137,6 +137,7 @@ css_register_subchannel(struct subchannel *sch)
 	sch->dev.parent = &css[0]->device;
 	sch->dev.bus = &css_bus_type;
 	sch->dev.release = &css_subchannel_release;
+	sch->dev.groups = subch_attr_groups;
 
 	/* make it known to the system */
 	ret = css_sch_device_register(sch);
@@ -146,10 +147,6 @@ css_register_subchannel(struct subchannel *sch)
 		return ret;
 	}
 	css_get_ssd_info(sch);
-	ret = subchannel_add_files(&sch->dev);
-	if (ret)
-		printk(KERN_WARNING "%s: could not add attributes to %s\n",
-		       __func__, sch->dev.bus_id);
 	return ret;
 }
 

drivers/s390/cio/css.h

@@ -195,4 +195,5 @@ extern struct workqueue_struct *slow_path_wq;
 extern struct work_struct slow_path_work;
 
 int subchannel_add_files (struct device *);
+extern struct attribute_group *subch_attr_groups[];
 #endif

drivers/s390/cio/device.c

@@ -235,9 +235,11 @@ chpids_show (struct device * dev, struct device_attribute *attr, char * buf)
 	ssize_t ret = 0;
 	int chp;
 
-	for (chp = 0; chp < 8; chp++)
-		ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]);
-
+	if (ssd)
+		for (chp = 0; chp < 8; chp++)
+			ret += sprintf (buf+ret, "%02x ", ssd->chpid[chp]);
+	else
+		ret += sprintf (buf, "n/a");
 	ret += sprintf (buf+ret, "\n");
 	return min((ssize_t)PAGE_SIZE, ret);
 }
@@ -531,10 +533,10 @@ static struct attribute_group subch_attr_group = {
 	.attrs = subch_attrs,
 };
 
-int subchannel_add_files (struct device *dev)
-{
-	return sysfs_create_group(&dev->kobj, &subch_attr_group);
-}
+struct attribute_group *subch_attr_groups[] = {
+	&subch_attr_group,
+	NULL,
+};
 
 static struct attribute * ccwdev_attrs[] = {
 	&dev_attr_devtype.attr,