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-rw-r--r--drivers/md/dm-sysfs.c10
-rw-r--r--drivers/md/dm.c11
-rw-r--r--drivers/md/dm.h2
3 files changed, 22 insertions, 1 deletions
diff --git a/drivers/md/dm-sysfs.c b/drivers/md/dm-sysfs.c
index 84d2b91..e0cc5d6 100644
--- a/drivers/md/dm-sysfs.c
+++ b/drivers/md/dm-sysfs.c
@@ -79,6 +79,11 @@ static const struct sysfs_ops dm_sysfs_ops = {
.show = dm_attr_show,
};
+static void dm_kobject_release(struct kobject *kobj)
+{
+ complete(dm_get_completion_from_kobject(kobj));
+}
+
/*
* dm kobject is embedded in mapped_device structure
* no need to define release function here
@@ -86,6 +91,7 @@ static const struct sysfs_ops dm_sysfs_ops = {
static struct kobj_type dm_ktype = {
.sysfs_ops = &dm_sysfs_ops,
.default_attrs = dm_attrs,
+ .release = dm_kobject_release,
};
/*
@@ -104,5 +110,7 @@ int dm_sysfs_init(struct mapped_device *md)
*/
void dm_sysfs_exit(struct mapped_device *md)
{
- kobject_put(dm_kobject(md));
+ struct kobject *kobj = dm_kobject(md);
+ kobject_put(kobj);
+ wait_for_completion(dm_get_completion_from_kobject(kobj));
}
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index b3e26c7..c157959 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -197,6 +197,9 @@ struct mapped_device {
/* sysfs handle */
struct kobject kobj;
+ /* wait until the kobject is released */
+ struct completion kobj_completion;
+
/* zero-length flush that will be cloned and submitted to targets */
struct bio flush_bio;
@@ -2005,6 +2008,7 @@ static struct mapped_device *alloc_dev(int minor)
init_waitqueue_head(&md->wait);
INIT_WORK(&md->work, dm_wq_work);
init_waitqueue_head(&md->eventq);
+ init_completion(&md->kobj_completion);
md->disk->major = _major;
md->disk->first_minor = minor;
@@ -2889,6 +2893,13 @@ struct mapped_device *dm_get_from_kobject(struct kobject *kobj)
return md;
}
+struct completion *dm_get_completion_from_kobject(struct kobject *kobj)
+{
+ struct mapped_device *md = container_of(kobj, struct mapped_device, kobj);
+
+ return &md->kobj_completion;
+}
+
int dm_suspended_md(struct mapped_device *md)
{
return test_bit(DMF_SUSPENDED, &md->flags);
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 1d1ad7b..a3406e0 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -15,6 +15,7 @@
#include <linux/list.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>
+#include <linux/completion.h>
#include "dm-stats.h"
@@ -142,6 +143,7 @@ int dm_sysfs_init(struct mapped_device *md);
void dm_sysfs_exit(struct mapped_device *md);
struct kobject *dm_kobject(struct mapped_device *md);
struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
+struct completion *dm_get_completion_from_kobject(struct kobject *kobj);
/*
* Targets for linear and striped mappings