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blk-mq: Register <dev>/queue/mq after having registered <dev>/queue

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A later patch in this series will modify blk_mq_debugfs_register()
such that it uses q->kobj.parent to determine the name of a
request queue. Hence make sure that that pointer is initialized
before blk_mq_debugfs_register() is called. To avoid lock inversion,
protect sysfs / debugfs registration with the queue sysfs_lock
instead of the global mutex all_q_mutex.

Signed-off-by: Bart Van Assche <[email protected]>
Reviewed-by: Hannes Reinecke <[email protected]>
Reviewed-by: Omar Sandoval <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Bart Van Assche 2017-04-26 13:47:48 -07:00 • committed by Jens Axboe
commit 2d0364c8c1
3 changed files with 32 additions and 10 deletions
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6
block/blk-sysfs.c
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@ -877,9 +877,6 @@ int blk_register_queue(struct gendisk *disk)
if (ret)
return ret;
if (q->mq_ops)
blk_mq_register_dev(dev, q);
/* Prevent changes through sysfs until registration is completed. */
mutex_lock(&q->sysfs_lock);
@ -889,6 +886,9 @@ int blk_register_queue(struct gendisk *disk)
goto unlock;
}
if (q->mq_ops)
__blk_mq_register_dev(dev, q);
kobject_uevent(&q->kobj, KOBJ_ADD);
wbt_enable_default(q);