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blk-mq-debugfs: fix device sched directory for default scheduler 

In blk_mq_debugfs_register(), I remembered to set up the per-hctx sched
directories if a default scheduler was already configured by
blk_mq_sched_init() from blk_mq_init_allocated_queue(), but I didn't do
the same for the device-wide sched directory. Fix it.

Fixes: d332ce0918 ("blk-mq-debugfs: allow schedulers to register debugfs attributes")
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Omar Sandoval 2017-10-03 14:57:16 -07:00 committed by Jens Axboe
parent 6cd1a6fef7
commit 70e62f4bac
1 changed files with 5 additions and 1 deletions
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6
block/blk-mq-debugfs.c
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@ -815,10 +815,14 @@ int blk_mq_debugfs_register(struct request_queue *q)
goto err;
/*
* blk_mq_init_hctx() attempted to do this already, but q->debugfs_dir
* blk_mq_init_sched() attempted to do this already, but q->debugfs_dir
* didn't exist yet (because we don't know what to name the directory
* until the queue is registered to a gendisk).
*/
if (q->elevator && !q->sched_debugfs_dir)
blk_mq_debugfs_register_sched(q);
/* Similarly, blk_mq_init_hctx() couldn't do this previously. */
queue_for_each_hw_ctx(q, hctx, i) {
if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx))
goto err;