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authorChristoph Hellwig <hch@lst.de>2022-06-14 10:48:26 +0300
committerJens Axboe <axboe@kernel.dk>2022-06-17 16:31:05 +0300
commit99d055b4fd4bbb309c6cdb51a0d420669f777944 (patch)
tree78067608566f43cf1bf92af677150729eb8e2e10 /block/blk-sysfs.c
parent5cf9c91ba927119fc6606b938b1895bb2459d3bc (diff)
downloadlinux-99d055b4fd4bbb309c6cdb51a0d420669f777944.tar.xz
block: remove per-disk debugfs files in blk_unregister_queue
The block debugfs files are created in blk_register_queue, which is called by add_disk and use a naming scheme based on the disk_name. After del_gendisk returns that name can be reused and thus we must not leave these debugfs files around, otherwise the kernel is unhappy and spews messages like: Directory XXXXX with parent 'block' already present! and the newly created devices will not have working debugfs files. Move the unregistration to blk_unregister_queue instead (which matches the sysfs unregistration) to make sure the debugfs life time rules match those of the disk name. As part of the move also make sure the whole debugfs unregistration is inside a single debugfs_mutex critical section. Note that this breaks blktests block/002, which checks that the debugfs directory has not been removed while blktests is running, but that particular check should simply be removed from the test case. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220614074827.458955-4-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-sysfs.c')
-rw-r--r--block/blk-sysfs.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 6e4801b217a7..9b905e9443e4 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -779,13 +779,6 @@ static void blk_release_queue(struct kobject *kobj)
if (queue_is_mq(q))
blk_mq_release(q);
- mutex_lock(&q->debugfs_mutex);
- blk_trace_shutdown(q);
- debugfs_remove_recursive(q->debugfs_dir);
- q->debugfs_dir = NULL;
- q->sched_debugfs_dir = NULL;
- mutex_unlock(&q->debugfs_mutex);
-
bioset_exit(&q->bio_split);
if (blk_queue_has_srcu(q))
@@ -946,8 +939,15 @@ void blk_unregister_queue(struct gendisk *disk)
/* Now that we've deleted all child objects, we can delete the queue. */
kobject_uevent(&q->kobj, KOBJ_REMOVE);
kobject_del(&q->kobj);
-
mutex_unlock(&q->sysfs_dir_lock);
+ mutex_lock(&q->debugfs_mutex);
+ blk_trace_shutdown(q);
+ debugfs_remove_recursive(q->debugfs_dir);
+ q->debugfs_dir = NULL;
+ q->sched_debugfs_dir = NULL;
+ q->rqos_debugfs_dir = NULL;
+ mutex_unlock(&q->debugfs_mutex);
+
kobject_put(&disk_to_dev(disk)->kobj);
}