From c12c9a3c3860c76ba273798c0c34c6f1294cc759 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@redhat.com>
Date: Fri, 12 Jan 2018 09:32:21 -0500
Subject: [PATCH] dm: various cleanups to md->queue initialization code

Also, add dm_sysfs_init() error handling to dm_create().

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
 drivers/md/dm-core.h |  2 --
 drivers/md/dm-rq.c   |  2 --
 drivers/md/dm.c      | 30 ++++++++++++------------------
 3 files changed, 12 insertions(+), 22 deletions(-)

diff --git a/drivers/md/dm-core.h b/drivers/md/dm-core.h
index 124ffa2d6b9a..3222e21cbbf8 100644
--- a/drivers/md/dm-core.h
+++ b/drivers/md/dm-core.h
@@ -129,8 +129,6 @@ struct mapped_device {
 	struct srcu_struct io_barrier;
 };
 
-void dm_init_md_queue(struct mapped_device *md);
-void dm_init_normal_md_queue(struct mapped_device *md);
 int md_in_flight(struct mapped_device *md);
 void disable_write_same(struct mapped_device *md);
 void disable_write_zeroes(struct mapped_device *md);
diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index b78ff6921cfb..c59c59cfd2a5 100644
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -704,7 +704,6 @@ int dm_old_init_request_queue(struct mapped_device *md, struct dm_table *t)
 	/* disable dm_old_request_fn's merge heuristic by default */
 	md->seq_rq_merge_deadline_usecs = 0;
 
-	dm_init_normal_md_queue(md);
 	blk_queue_softirq_done(md->queue, dm_softirq_done);
 
 	/* Initialize the request-based DM worker thread */
@@ -814,7 +813,6 @@ int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t)
 		err = PTR_ERR(q);
 		goto out_tag_set;
 	}
-	dm_init_md_queue(md);
 
 	/* backfill 'mq' sysfs registration normally done in blk_register_queue */
 	err = blk_mq_register_dev(disk_to_dev(md->disk), q);
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 67bf11610e4d..148087932679 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1733,20 +1733,9 @@ static const struct dax_operations dm_dax_ops;
 
 static void dm_wq_work(struct work_struct *work);
 
-void dm_init_md_queue(struct mapped_device *md)
-{
-	/*
-	 * Initialize data that will only be used by a non-blk-mq DM queue
-	 * - must do so here (in alloc_dev callchain) before queue is used
-	 */
-	md->queue->queuedata = md;
-	md->queue->backing_dev_info->congested_data = md;
-}
-
-void dm_init_normal_md_queue(struct mapped_device *md)
+static void dm_init_normal_md_queue(struct mapped_device *md)
 {
 	md->use_blk_mq = false;
-	dm_init_md_queue(md);
 
 	/*
 	 * Initialize aspects of queue that aren't relevant for blk-mq
@@ -1846,10 +1835,10 @@ static struct mapped_device *alloc_dev(int minor)
 	md->queue = blk_alloc_queue_node(GFP_KERNEL, numa_node_id);
 	if (!md->queue)
 		goto bad;
+	md->queue->queuedata = md;
+	md->queue->backing_dev_info->congested_data = md;
 
-	dm_init_md_queue(md);
-
-	md->disk = alloc_disk_node(1, numa_node_id);
+	md->disk = alloc_disk_node(1, md->numa_node_id);
 	if (!md->disk)
 		goto bad;
 
@@ -2082,13 +2071,18 @@ static struct dm_table *__unbind(struct mapped_device *md)
  */
 int dm_create(int minor, struct mapped_device **result)
 {
+	int r;
 	struct mapped_device *md;
 
 	md = alloc_dev(minor);
 	if (!md)
 		return -ENXIO;
 
-	dm_sysfs_init(md);
+	r = dm_sysfs_init(md);
+	if (r) {
+		free_dev(md);
+		return r;
+	}
 
 	*result = md;
 	return 0;
@@ -2145,6 +2139,7 @@ int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
 
 	switch (type) {
 	case DM_TYPE_REQUEST_BASED:
+		dm_init_normal_md_queue(md);
 		r = dm_old_init_request_queue(md, t);
 		if (r) {
 			DMERR("Cannot initialize queue for request-based mapped device");
@@ -2236,7 +2231,6 @@ EXPORT_SYMBOL_GPL(dm_device_name);
 
 static void __dm_destroy(struct mapped_device *md, bool wait)
 {
-	struct request_queue *q = dm_get_md_queue(md);
 	struct dm_table *map;
 	int srcu_idx;
 
@@ -2247,7 +2241,7 @@ static void __dm_destroy(struct mapped_device *md, bool wait)
 	set_bit(DMF_FREEING, &md->flags);
 	spin_unlock(&_minor_lock);
 
-	blk_set_queue_dying(q);
+	blk_set_queue_dying(md->queue);
 
 	if (dm_request_based(md) && md->kworker_task)
 		kthread_flush_worker(&md->kworker);