[PATCH 2/3] aoe: close udev startup race condition as default groups

[Jeffle Xu <jefflexu@linux.alibaba.com>]

commit fef912bf860e8e7e48a2bfb978a356bba743a8b7 upstream.
commit 95cf7809bf9169fec4e4b7bb24b8069d8f354f96 upstream.

Similar to commit 9e07f4e24379 ("zram: close udev startup race condition
as default groups"), this is a merge of [1, 2], since [1] may be too
large size to be merged into -stable tree.

[1] fef912bf860e, block: genhd: add 'groups' argument to device_add_disk
[2] 95cf7809bf91, aoe: register default groups with device_add_disk()

Cc: Hannes Reinecke <hare@suse.de>
Cc: stable@vger.kernel.org # 4.4+
Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com>
---
 drivers/block/aoe/aoe.h    |  1 -
 drivers/block/aoe/aoeblk.c | 20 +++++++-------------
 drivers/block/aoe/aoedev.c |  1 -
 3 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h
index c0ebda1283cc..015c68017a1c 100644
--- a/drivers/block/aoe/aoe.h
+++ b/drivers/block/aoe/aoe.h
@@ -201,7 +201,6 @@ int aoeblk_init(void);
 void aoeblk_exit(void);
 void aoeblk_gdalloc(void *);
 void aoedisk_rm_debugfs(struct aoedev *d);
-void aoedisk_rm_sysfs(struct aoedev *d);
 
 int aoechr_init(void);
 void aoechr_exit(void);
diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
index 429ebb84b592..769f3a10054e 100644
--- a/drivers/block/aoe/aoeblk.c
+++ b/drivers/block/aoe/aoeblk.c
@@ -177,10 +177,15 @@ static struct attribute *aoe_attrs[] = {
 	NULL,
 };
 
-static const struct attribute_group attr_group = {
+static const struct attribute_group aoe_attr_group = {
 	.attrs = aoe_attrs,
 };
 
+static const struct attribute_group *aoe_attr_groups[] = {
+	&aoe_attr_group,
+	NULL,
+};
+
 static const struct file_operations aoe_debugfs_fops = {
 	.open = aoe_debugfs_open,
 	.read = seq_read,
@@ -219,17 +224,6 @@ aoedisk_rm_debugfs(struct aoedev *d)
 	d->debugfs = NULL;
 }
 
-static int
-aoedisk_add_sysfs(struct aoedev *d)
-{
-	return sysfs_create_group(&disk_to_dev(d->gd)->kobj, &attr_group);
-}
-void
-aoedisk_rm_sysfs(struct aoedev *d)
-{
-	sysfs_remove_group(&disk_to_dev(d->gd)->kobj, &attr_group);
-}
-
 static int
 aoeblk_open(struct block_device *bdev, fmode_t mode)
 {
@@ -417,8 +411,8 @@ aoeblk_gdalloc(void *vp)
 
 	spin_unlock_irqrestore(&d->lock, flags);
 
+	disk_to_dev(gd)->groups = aoe_attr_groups;
 	add_disk(gd);
-	aoedisk_add_sysfs(d);
 	aoedisk_add_debugfs(d);
 
 	spin_lock_irqsave(&d->lock, flags);
diff --git a/drivers/block/aoe/aoedev.c b/drivers/block/aoe/aoedev.c
index 41060e9cedf2..f29a140cdbc1 100644
--- a/drivers/block/aoe/aoedev.c
+++ b/drivers/block/aoe/aoedev.c
@@ -275,7 +275,6 @@ freedev(struct aoedev *d)
 	del_timer_sync(&d->timer);
 	if (d->gd) {
 		aoedisk_rm_debugfs(d);
-		aoedisk_rm_sysfs(d);
 		del_gendisk(d->gd);
 		put_disk(d->gd);
 		blk_cleanup_queue(d->blkq);
-- 
2.27.0