Merge tag 'block-5.17-2022-01-21' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "Various little minor fixes that should go into this release:

   - Fix issue with cloned bios and IO accounting (Christoph)

   - Remove redundant assignments (Colin, GuoYong)

   - Fix an issue with the mq-deadline async_depth sysfs interface (me)

   - Fix brd module loading race (Tetsuo)

   - Shared tag map wakeup fix (Laibin)

   - End of bdev read fix (OGAWA)

   - srcu leak fix (Ming)"

* tag 'block-5.17-2022-01-21' of git://git.kernel.dk/linux-block:
  block: fix async_depth sysfs interface for mq-deadline
  block: Fix wrong offset in bio_truncate()
  block: assign bi_bdev for cloned bios in blk_rq_prep_clone
  block: cleanup q->srcu
  block: Remove unnecessary variable assignment
  brd: remove brd_devices_mutex mutex
  aoe: remove redundant assignment on variable n
  loop: remove redundant initialization of pointer node
  blk-mq: fix tag_get wait task can't be awakened

3 files changed, 32 insertions, 45 deletions

diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index 588889bea7c3..6af111f568e4 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -122,7 +122,7 @@ newtag(struct aoedev *d)
 	register ulong n;
 
 	n = jiffies & 0xffff;
-	return n |= (++d->lasttag & 0x7fff) << 16;
+	return n | (++d->lasttag & 0x7fff) << 16;
 }
 
 static u32
diff --git a/drivers/block/brd.c b/drivers/block/brd.c
index 8fe2e4289dae..6e3f2f0d2352 100644
--- a/drivers/block/brd.c
+++ b/drivers/block/brd.c
@@ -362,7 +362,6 @@ __setup("ramdisk_size=", ramdisk_size);
  * (should share code eventually).
  */
 static LIST_HEAD(brd_devices);
-static DEFINE_MUTEX(brd_devices_mutex);
 static struct dentry *brd_debugfs_dir;
 
 static int brd_alloc(int i)
@@ -372,21 +371,14 @@ static int brd_alloc(int i)
 	char buf[DISK_NAME_LEN];
 	int err = -ENOMEM;
 
-	mutex_lock(&brd_devices_mutex);
-	list_for_each_entry(brd, &brd_devices, brd_list) {
-		if (brd->brd_number == i) {
-			mutex_unlock(&brd_devices_mutex);
+	list_for_each_entry(brd, &brd_devices, brd_list)
+		if (brd->brd_number == i)
 			return -EEXIST;
-		}
-	}
 	brd = kzalloc(sizeof(*brd), GFP_KERNEL);
-	if (!brd) {
-		mutex_unlock(&brd_devices_mutex);
+	if (!brd)
 		return -ENOMEM;
-	}
 	brd->brd_number		= i;
 	list_add_tail(&brd->brd_list, &brd_devices);
-	mutex_unlock(&brd_devices_mutex);
 
 	spin_lock_init(&brd->brd_lock);
 	INIT_RADIX_TREE(&brd->brd_pages, GFP_ATOMIC);
@@ -429,9 +421,7 @@ static int brd_alloc(int i)
 out_cleanup_disk:
 	blk_cleanup_disk(disk);
 out_free_dev:
-	mutex_lock(&brd_devices_mutex);
 	list_del(&brd->brd_list);
-	mutex_unlock(&brd_devices_mutex);
 	kfree(brd);
 	return err;
 }
@@ -441,15 +431,19 @@ static void brd_probe(dev_t dev)
 	brd_alloc(MINOR(dev) / max_part);
 }
 
-static void brd_del_one(struct brd_device *brd)
+static void brd_cleanup(void)
 {
-	del_gendisk(brd->brd_disk);
-	blk_cleanup_disk(brd->brd_disk);
-	brd_free_pages(brd);
-	mutex_lock(&brd_devices_mutex);
-	list_del(&brd->brd_list);
-	mutex_unlock(&brd_devices_mutex);
-	kfree(brd);
+	struct brd_device *brd, *next;
+
+	debugfs_remove_recursive(brd_debugfs_dir);
+
+	list_for_each_entry_safe(brd, next, &brd_devices, brd_list) {
+		del_gendisk(brd->brd_disk);
+		blk_cleanup_disk(brd->brd_disk);
+		brd_free_pages(brd);
+		list_del(&brd->brd_list);
+		kfree(brd);
+	}
 }
 
 static inline void brd_check_and_reset_par(void)
@@ -473,9 +467,18 @@ static inline void brd_check_and_reset_par(void)
 
 static int __init brd_init(void)
 {
-	struct brd_device *brd, *next;
 	int err, i;
 
+	brd_check_and_reset_par();
+
+	brd_debugfs_dir = debugfs_create_dir("ramdisk_pages", NULL);
+
+	for (i = 0; i < rd_nr; i++) {
+		err = brd_alloc(i);
+		if (err)
+			goto out_free;
+	}
+
 	/*
 	 * brd module now has a feature to instantiate underlying device
 	 * structure on-demand, provided that there is an access dev node.
@@ -491,28 +494,16 @@ static int __init brd_init(void)
 	 *	dynamically.
 	 */
 
-	if (__register_blkdev(RAMDISK_MAJOR, "ramdisk", brd_probe))
-		return -EIO;
-
-	brd_check_and_reset_par();
-
-	brd_debugfs_dir = debugfs_create_dir("ramdisk_pages", NULL);
-
-	for (i = 0; i < rd_nr; i++) {
-		err = brd_alloc(i);
-		if (err)
-			goto out_free;
+	if (__register_blkdev(RAMDISK_MAJOR, "ramdisk", brd_probe)) {
+		err = -EIO;
+		goto out_free;
 	}
 
 	pr_info("brd: module loaded\n");
 	return 0;
 
 out_free:
-	unregister_blkdev(RAMDISK_MAJOR, "ramdisk");
-	debugfs_remove_recursive(brd_debugfs_dir);
-
-	list_for_each_entry_safe(brd, next, &brd_devices, brd_list)
-		brd_del_one(brd);
+	brd_cleanup();
 
 	pr_info("brd: module NOT loaded !!!\n");
 	return err;
@@ -520,13 +511,9 @@ out_free:
 
 static void __exit brd_exit(void)
 {
-	struct brd_device *brd, *next;
 
 	unregister_blkdev(RAMDISK_MAJOR, "ramdisk");
-	debugfs_remove_recursive(brd_debugfs_dir);
-
-	list_for_each_entry_safe(brd, next, &brd_devices, brd_list)
-		brd_del_one(brd);
+	brd_cleanup();
 
 	pr_info("brd: module unloaded\n");
 }
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index b1b05c45c07c..01cbbfc4e9e2 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -820,7 +820,7 @@ static inline int queue_on_root_worker(struct cgroup_subsys_state *css)
 
 static void loop_queue_work(struct loop_device *lo, struct loop_cmd *cmd)
 {
-	struct rb_node **node = &(lo->worker_tree.rb_node), *parent = NULL;
+	struct rb_node **node, *parent = NULL;
 	struct loop_worker *cur_worker, *worker = NULL;
 	struct work_struct *work;
 	struct list_head *cmd_list;