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| author | Jan Kara <jack@suse.cz> | 2017-03-08 17:48:34 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2017-03-08 10:55:17 -0700 |
| commit | c01228db4ba965986511a5b28c478bddd7e2726e (patch) | |
| tree | 41fe10418d432b17e93898ed9f84b8aebc78c7ad /block/genhd.c | |
| parent | 90f16fddcc2802726142b8386c65ccb89f044613 (diff) | |
| download | lwn-c01228db4ba965986511a5b28c478bddd7e2726e.tar.gz lwn-c01228db4ba965986511a5b28c478bddd7e2726e.zip | |
Revert "scsi, block: fix duplicate bdi name registration crashes"
This reverts commit 0dba1314d4f81115dce711292ec7981d17231064. It causes
leaking of device numbers for SCSI when SCSI registers multiple gendisks
for one request_queue in succession. It can be easily reproduced using
Omar's script [1] on kernel with CONFIG_DEBUG_TEST_DRIVER_REMOVE.
Furthermore the protection provided by this commit is not needed anymore
as the problem it was fixing got also fixed by commit 165a5e22fafb
"block: Move bdi_unregister() to del_gendisk()".
[1]: http://marc.info/?l=linux-block&m=148554717109098&w=2
Signed-off-by: Jan Kara <jack@suse.cz>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Tested-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/genhd.c')
| -rw-r--r-- | block/genhd.c | 21 |
1 files changed, 0 insertions, 21 deletions
diff --git a/block/genhd.c b/block/genhd.c index 94f323842b52..a9c516a8b37d 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -572,20 +572,6 @@ 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 @@ -626,13 +612,6 @@ 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)); |