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authorBart Van Assche <bvanassche@acm.org>2019-09-30 16:00:43 -0700
committerJens Axboe <axboe@kernel.dk>2019-10-07 08:31:59 -0600
commitbae85c156f619939ef6261f1bd4fabbe24361b50 (patch)
treec84786cb0148d7e0a5d0ded9b903d6bcc5aeadd8 /block
parent9566256518de0520c964bdf23140eac324b136af (diff)
block: Remove "dying" checks from sysfs callbacks
Block drivers must call del_gendisk() before blk_cleanup_queue(). del_gendisk() calls kobject_del() and kobject_del() waits until any ongoing sysfs callback functions have finished. In other words, the sysfs callback functions won't be called for a queue in the dying state. Hence remove the "dying" checks from the sysfs callback functions. Cc: Christoph Hellwig <hch@infradead.org> Cc: Ming Lei <ming.lei@redhat.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c2
-rw-r--r--block/blk-mq-sysfs.c16
-rw-r--r--block/blk-sysfs.c8
3 files changed, 6 insertions, 20 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index d5e668ec751b..8b51d9ec8ae3 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -336,6 +336,8 @@ EXPORT_SYMBOL_GPL(blk_set_queue_dying);
*/
void blk_cleanup_queue(struct request_queue *q)
{
+ WARN_ON_ONCE(blk_queue_registered(q));
+
/* mark @q DYING, no new request or merges will be allowed afterwards */
mutex_lock(&q->sysfs_lock);
blk_set_queue_dying(q);
diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index a0d3ce30fa08..81a273b43329 100644
--- a/block/blk-mq-sysfs.c
+++ b/block/blk-mq-sysfs.c
@@ -74,10 +74,8 @@ static ssize_t blk_mq_sysfs_show(struct kobject *kobj, struct attribute *attr,
if (!entry->show)
return -EIO;
- res = -ENOENT;
mutex_lock(&q->sysfs_lock);
- if (!blk_queue_dying(q))
- res = entry->show(ctx, page);
+ res = entry->show(ctx, page);
mutex_unlock(&q->sysfs_lock);
return res;
}
@@ -97,10 +95,8 @@ static ssize_t blk_mq_sysfs_store(struct kobject *kobj, struct attribute *attr,
if (!entry->store)
return -EIO;
- res = -ENOENT;
mutex_lock(&q->sysfs_lock);
- if (!blk_queue_dying(q))
- res = entry->store(ctx, page, length);
+ res = entry->store(ctx, page, length);
mutex_unlock(&q->sysfs_lock);
return res;
}
@@ -120,10 +116,8 @@ static ssize_t blk_mq_hw_sysfs_show(struct kobject *kobj,
if (!entry->show)
return -EIO;
- res = -ENOENT;
mutex_lock(&q->sysfs_lock);
- if (!blk_queue_dying(q))
- res = entry->show(hctx, page);
+ res = entry->show(hctx, page);
mutex_unlock(&q->sysfs_lock);
return res;
}
@@ -144,10 +138,8 @@ static ssize_t blk_mq_hw_sysfs_store(struct kobject *kobj,
if (!entry->store)
return -EIO;
- res = -ENOENT;
mutex_lock(&q->sysfs_lock);
- if (!blk_queue_dying(q))
- res = entry->store(hctx, page, length);
+ res = entry->store(hctx, page, length);
mutex_unlock(&q->sysfs_lock);
return res;
}
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 46f5198be017..fca9b158f4a0 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -801,10 +801,6 @@ queue_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
if (!entry->show)
return -EIO;
mutex_lock(&q->sysfs_lock);
- if (blk_queue_dying(q)) {
- mutex_unlock(&q->sysfs_lock);
- return -ENOENT;
- }
res = entry->show(q, page);
mutex_unlock(&q->sysfs_lock);
return res;
@@ -823,10 +819,6 @@ queue_attr_store(struct kobject *kobj, struct attribute *attr,
q = container_of(kobj, struct request_queue, kobj);
mutex_lock(&q->sysfs_lock);
- if (blk_queue_dying(q)) {
- mutex_unlock(&q->sysfs_lock);
- return -ENOENT;
- }
res = entry->store(q, page, length);
mutex_unlock(&q->sysfs_lock);
return res;