linux-kernel - [PATCH 4.19 13/39] aoe: register default groups with device_add

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Date:   Wed, 10 Mar 2021 14:24:21 +0100
From:   gregkh@...uxfoundation.org
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hannes Reinecke <hare@...e.com>,
        Christoph Hellwig <hch@....de>,
        "Ed L. Cachin" <ed.cashin@....org>,
        Bart Van Assche <bart.vanassche@....com>,
        Jens Axboe <axboe@...nel.dk>,
        Jeffle Xu <jefflexu@...ux.alibaba.com>
Subject: [PATCH 4.19 13/39] aoe: register default groups with device_add_disk()

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

From: Hannes Reinecke <hare@...e.de>

commit 95cf7809bf9169fec4e4b7bb24b8069d8f354f96 upstream.

Register default sysfs groups during device_add_disk() to avoid a
race condition with udev during startup.

Signed-off-by: Hannes Reinecke <hare@...e.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Acked-by: Ed L. Cachin <ed.cashin@....org>
Reviewed-by: Bart Van Assche <bart.vanassche@....com>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Jeffle Xu <jefflexu@...ux.alibaba.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/block/aoe/aoe.h    |    1 -
 drivers/block/aoe/aoeblk.c |   21 +++++++--------------
 drivers/block/aoe/aoedev.c |    1 -
 3 files changed, 7 insertions(+), 16 deletions(-)

--- 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);
--- 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,
@@ -220,17 +225,6 @@ aoedisk_rm_debugfs(struct aoedev *d)
 }
 
 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)
 {
 	struct aoedev *d = bdev->bd_disk->private_data;
@@ -417,8 +411,7 @@ aoeblk_gdalloc(void *vp)
 
 	spin_unlock_irqrestore(&d->lock, flags);
 
-	add_disk(gd);
-	aoedisk_add_sysfs(d);
+	device_add_disk(NULL, gd, aoe_attr_groups);
 	aoedisk_add_debugfs(d);
 
 	spin_lock_irqsave(&d->lock, flags);
--- 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);