@@ -258,7 +258,7 @@ static void __blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
queue_for_each_hw_ctx(q, hctx, i)
blk_mq_unregister_hctx(hctx);
- blk_mq_debugfs_unregister_hctxs(q);
+ blk_mq_debugfs_unregister(q);
kobject_uevent(&q->mq_kobj, KOBJ_REMOVE);
kobject_del(&q->mq_kobj);
@@ -306,8 +306,7 @@ void blk_mq_sysfs_init(struct request_queue *q)
int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
{
- struct blk_mq_hw_ctx *hctx;
- int ret, i;
+ int ret;
WARN_ON_ONCE(!q->kobj.parent);
lockdep_assert_held(&q->sysfs_lock);
@@ -318,14 +317,7 @@ int __blk_mq_register_dev(struct device *dev, struct request_queue *q)
kobject_uevent(&q->mq_kobj, KOBJ_ADD);
- blk_mq_debugfs_register(q);
-
- queue_for_each_hw_ctx(q, hctx, i) {
- ret = blk_mq_register_hctx(hctx);
- if (ret)
- break;
- }
-
+ ret = blk_mq_debugfs_register(q);
if (ret)
__blk_mq_unregister_dev(dev, q);
else
@@ -349,20 +341,9 @@ EXPORT_SYMBOL_GPL(blk_mq_register_dev);
void blk_mq_sysfs_unregister(struct request_queue *q)
{
- struct blk_mq_hw_ctx *hctx;
- int i;
-
mutex_lock(&q->sysfs_lock);
-
- if (!q->mq_sysfs_init_done)
- goto unlock;
-
- blk_mq_debugfs_unregister_hctxs(q);
-
- queue_for_each_hw_ctx(q, hctx, i)
- blk_mq_unregister_hctx(hctx);
-
-unlock:
+ if (q->mq_sysfs_init_done)
+ blk_mq_debugfs_unregister(q);
mutex_unlock(&q->sysfs_lock);
}
@@ -376,7 +357,7 @@ int blk_mq_sysfs_register(struct request_queue *q)
if (!q->mq_sysfs_init_done)
goto unlock;
- blk_mq_debugfs_register_hctxs(q);
+ blk_mq_debugfs_register(q);
queue_for_each_hw_ctx(q, hctx, i) {
ret = blk_mq_register_hctx(hctx);
@@ -823,8 +823,7 @@ static void blk_release_queue(struct kobject *kobj)
blk_trace_shutdown(q);
- if (q->mq_ops)
- blk_mq_debugfs_unregister(q);
+ WARN_ON_ONCE(q->debugfs_dir);
if (q->bio_split)
bioset_free(q->bio_split);
One of the debugfs attributes allows to run a queue. Since running a queue after a queue has entered the "dead" state is not allowed and even can cause a kernel crash, unregister the debugfs attributes before a queue reaches the "dead" state. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Omar Sandoval <osandov@fb.com> Cc: Hannes Reinecke <hare@suse.com> --- block/blk-mq-sysfs.c | 31 ++++++------------------------- block/blk-sysfs.c | 3 +-- 2 files changed, 7 insertions(+), 27 deletions(-)