diff options
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 1 | ||||
| -rw-r--r-- | block/genhd.c | 21 |
2 files changed, 22 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index a3c29270807e..a5726e01f839 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -572,6 +572,7 @@ void blk_cleanup_queue(struct request_queue *q) spin_unlock_irq(lock); bdi_unregister(q->backing_dev_info); + put_disk_devt(q->disk_devt); /* @q is and will stay empty, shutdown and put */ blk_put_queue(q); diff --git a/block/genhd.c b/block/genhd.c index d9ccd42f3675..3631cd480295 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -572,6 +572,20 @@ exit: disk_part_iter_exit(&piter); } +void put_disk_devt(struct disk_devt *disk_devt) +{ + if (disk_devt && atomic_dec_and_test(&disk_devt->count)) + disk_devt->release(disk_devt); +} +EXPORT_SYMBOL(put_disk_devt); + +void get_disk_devt(struct disk_devt *disk_devt) +{ + if (disk_devt) + atomic_inc(&disk_devt->count); +} +EXPORT_SYMBOL(get_disk_devt); + /** * device_add_disk - add partitioning information to kernel list * @parent: parent device for the disk @@ -612,6 +626,13 @@ void device_add_disk(struct device *parent, struct gendisk *disk) disk_alloc_events(disk); + /* + * Take a reference on the devt and assign it to queue since it + * must not be reallocated while the bdi is registered + */ + disk->queue->disk_devt = disk->disk_devt; + get_disk_devt(disk->disk_devt); + /* Register BDI before referencing it from bdev */ bdi = disk->queue->backing_dev_info; bdi_register_owner(bdi, disk_to_dev(disk)); |