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block: grab a device refcount in disk_uevent 

Sending uevents requires the struct device to be alive.  To
ensure that grab the device refcount instead of just an inode
reference.

Fixes: bc359d03c7 ("block: add a disk_uevent helper")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210701081638.246552-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-07-01 10:16:37 +02:00 committed by Jens Axboe
parent 2b7a8dc06d
commit 498dcc13fd
1 changed files with 2 additions and 2 deletions
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4
block/genhd.c
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@ -365,12 +365,12 @@ void disk_uevent(struct gendisk *disk, enum kobject_action action)
xa_for_each(&disk->part_tbl, idx, part) {
if (bdev_is_partition(part) && !bdev_nr_sectors(part))
continue;
if (!bdgrab(part))
if (!kobject_get_unless_zero(&part->bd_device.kobj))
continue;
rcu_read_unlock();
kobject_uevent(bdev_kobj(part), action);
bdput(part);
put_device(&part->bd_device);
rcu_read_lock();
}
rcu_read_unlock();