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authorSebastian Ott <sebott@linux.vnet.ibm.com>2009-09-22 22:58:35 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2009-09-22 22:58:41 +0200
commit8ea7f5590142c0b9ab319aa3cae85cf430a207d8 (patch)
treea23b12fbfe51077cc8df6694f4ab7225462b657d /drivers/s390
parent255305536c1b56ad09590f1400fb2c788265e34e (diff)
[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>
Diffstat (limited to 'drivers/s390')
-rw-r--r--drivers/s390/cio/css.c17
-rw-r--r--drivers/s390/cio/css.h2
-rw-r--r--drivers/s390/cio/device.c18
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;