From: Christoph Hellwig hch@lst.de
[ Upstream commit 7b5865831c1003122f737df5e16adaa583f1a595 ]
Take the list unlink and free into close_table_device so that no half torn down table_devices exist. Also remove the check for a NULL bdev as that can't happen - open_table_device never adds a table_device to the list that does not have a valid block_device.
Signed-off-by: Christoph Hellwig hch@lst.de Signed-off-by: Yu Kuai yukuai3@huawei.com Reviewed-by: Mike Snitzer snitzer@kernel.org Link: https://lore.kernel.org/r/20221115141054.1051801-5-yukuai1@huaweicloud.com Signed-off-by: Jens Axboe axboe@kernel.dk Stable-dep-of: 1a581b721699 ("dm: track per-add_disk holder relations in DM") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/md/dm.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 1903afa4618a..620abcef2df5 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -774,14 +774,11 @@ static struct table_device *open_table_device(struct mapped_device *md, */ static void close_table_device(struct table_device *td, struct mapped_device *md) { - if (!td->dm_dev.bdev) - return; - bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md)); blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL); put_dax(td->dm_dev.dax_dev); - td->dm_dev.bdev = NULL; - td->dm_dev.dax_dev = NULL; + list_del(&td->list); + kfree(td); }
static struct table_device *find_table_device(struct list_head *l, dev_t dev, @@ -823,11 +820,8 @@ void dm_put_table_device(struct mapped_device *md, struct dm_dev *d) struct table_device *td = container_of(d, struct table_device, dm_dev);
mutex_lock(&md->table_devices_lock); - if (refcount_dec_and_test(&td->count)) { + if (refcount_dec_and_test(&td->count)) close_table_device(td, md); - list_del(&td->list); - kfree(td); - } mutex_unlock(&md->table_devices_lock); }