s390/css: introduce cio_register_early_subchannels

Use cio_register_early_subchannels to register early subchannels
which are already in use. Call this function before we do the
actual subchannel scanning loop. This helps us to get rid of some
more special cases regarding the console subchannel.

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

1 files changed, 12 insertions, 19 deletions

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index fb0e64f1845a..3b2245f58bde 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -224,16 +224,11 @@ void css_update_ssd_info(struct subchannel *sch)
 {
 	int ret;
 
-	if (cio_is_console(sch->schid)) {
-		/* Console is initialized too early for functions requiring
-		 * memory allocation. */
+	ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info);
+	if (ret)
 		ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
-	} else {
-		ret = chsc_get_ssd_info(sch->schid, &sch->ssd_info);
-		if (ret)
-			ssd_from_pmcw(&sch->ssd_info, &sch->schib.pmcw);
-		ssd_register_chpids(&sch->ssd_info);
-	}
+
+	ssd_register_chpids(&sch->ssd_info);
 }
 
 static ssize_t type_show(struct device *dev, struct device_attribute *attr,
@@ -271,7 +266,7 @@ static const struct attribute_group *default_subch_attr_groups[] = {
 	NULL,
 };
 
-static int css_register_subchannel(struct subchannel *sch)
+int css_register_subchannel(struct subchannel *sch)
 {
 	int ret;
 
@@ -314,13 +309,10 @@ int css_probe_device(struct subchannel_id schid)
 	int ret;
 	struct subchannel *sch;
 
-	if (cio_is_console(schid))
-		sch = cio_get_console_subchannel();
-	else {
-		sch = css_alloc_subchannel(schid);
-		if (IS_ERR(sch))
-			return PTR_ERR(sch);
-	}
+	sch = css_alloc_subchannel(schid);
+	if (IS_ERR(sch))
+		return PTR_ERR(sch);
+
 	ret = css_register_subchannel(sch);
 	if (ret)
 		put_device(&sch->dev);
@@ -864,8 +856,7 @@ static struct notifier_block css_power_notifier = {
 
 /*
  * Now that the driver core is running, we can setup our channel subsystem.
- * The struct subchannel's are created during probing (except for the
- * static console subchannel).
+ * The struct subchannel's are created during probing.
  */
 static int __init css_bus_init(void)
 {
@@ -1044,6 +1035,8 @@ int css_complete_work(void)
  */
 static int __init channel_subsystem_init_sync(void)
 {
+	/* Register subchannels which are already in use. */
+	cio_register_early_subchannels();
 	/* Start initial subchannel evaluation. */
 	css_schedule_eval_all();
 	css_complete_work();