[S390] cio: introduce css_settle

Introduce the css_driver callback settle which can be implemented
by a subchannel driver to wait for the subchannel type specific
asynchronous work to finish.
In channel_subsystem_init_sync we call that for each subchannel
driver.

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

3 files changed, 25 insertions, 12 deletions

diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 59c4b94cdb4..f018835afdf 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -1013,6 +1013,15 @@ static int __init channel_subsystem_init(void)
 }
 subsys_initcall(channel_subsystem_init);
 
+static int css_settle(struct device_driver *drv, void *unused)
+{
+        struct css_driver *cssdrv = to_cssdriver(drv);
+
+        if (cssdrv->settle)
+                cssdrv->settle();
+        return 0;
+}
+
 /*
  * Wait for the initialization of devices to finish, to make sure we are
  * done with our setup if the search for the root device starts.
@@ -1024,12 +1033,8 @@ static int __init channel_subsystem_init_sync(void)
         /* Wait for the evaluation of subchannels to finish. */
         wait_event(css_eval_wq, atomic_read(&css_eval_scheduled) == 0);
 
-        /* Wait for the initialization of ccw devices to finish. */
-        wait_event(ccw_device_init_wq,
-                   atomic_read(&ccw_device_init_count) == 0);
-        flush_workqueue(ccw_device_work);
-
-        return 0;
+        /* Wait for the subchannel type specific initialization to finish */
+        return bus_for_each_drv(&css_bus_type, NULL, NULL, css_settle);
 }
 subsys_initcall_sync(channel_subsystem_init_sync);
 
diff --git a/drivers/s390/cio/css.h b/drivers/s390/cio/css.h
index 9763eeec745..54acdaade86 100644
--- a/drivers/s390/cio/css.h
+++ b/drivers/s390/cio/css.h
@@ -75,6 +75,7 @@ struct chp_link;
  * @freeze: callback for freezing during hibernation snapshotting
  * @thaw: undo work done in @freeze
  * @restore: callback for restoring after hibernation
+ * @settle: wait for asynchronous work to finish
  * @name: name of the device driver
  */
 struct css_driver {
@@ -92,6 +93,7 @@ struct css_driver {
         int (*freeze)(struct subchannel *);
         int (*thaw) (struct subchannel *);
         int (*restore)(struct subchannel *);
+        void (*settle)(void);
         const char *name;
 };
 
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 4093adc12f2..f780bdd3a04 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -131,6 +131,10 @@ static void io_subchannel_shutdown(struct subchannel *);
 static int io_subchannel_sch_event(struct subchannel *, int);
 static int io_subchannel_chp_event(struct subchannel *, struct chp_link *,
                                    int);
+static void recovery_func(unsigned long data);
+struct workqueue_struct *ccw_device_work;
+wait_queue_head_t ccw_device_init_wq;
+atomic_t ccw_device_init_count;
 
 static struct css_device_id io_subchannel_ids[] = {
         { .match_flags = 0x1, .type = SUBCHANNEL_TYPE_IO, },
@@ -151,6 +155,13 @@ static int io_subchannel_prepare(struct subchannel *sch)
         return 0;
 }
 
+static void io_subchannel_settle(void)
+{
+        wait_event(ccw_device_init_wq,
+                   atomic_read(&ccw_device_init_count) == 0);
+        flush_workqueue(ccw_device_work);
+}
+
 static struct css_driver io_subchannel_driver = {
         .owner = THIS_MODULE,
         .subchannel_type = io_subchannel_ids,
@@ -162,14 +173,9 @@ static struct css_driver io_subchannel_driver = {
         .remove = io_subchannel_remove,
         .shutdown = io_subchannel_shutdown,
         .prepare = io_subchannel_prepare,
+        .settle = io_subchannel_settle,
 };
 
-struct workqueue_struct *ccw_device_work;
-wait_queue_head_t ccw_device_init_wq;
-atomic_t ccw_device_init_count;
-
-static void recovery_func(unsigned long data);
-
 int __init io_subchannel_init(void)
 {
         int ret;