Merge tag 'for-5.17/block-2022-01-11' of git://git.kernel.dk/linux-block

Pull block updates from Jens Axboe:

 - Unify where the struct request handling code is located in the blk-mq
   code (Christoph)

 - Header cleanups (Christoph)

 - Clean up the io_context handling code (Christoph, me)

 - Get rid of ->rq_disk in struct request (Christoph)

 - Error handling fix for add_disk() (Christoph)

 - request allocation cleanusp (Christoph)

 - Documentation updates (Eric, Matthew)

 - Remove trivial crypto unregister helper (Eric)

 - Reduce shared tag overhead (John)

 - Reduce poll_stats memory overhead (me)

 - Known indirect function call for dio (me)

 - Use atomic references for struct request (me)

 - Support request list issue for block and NVMe (me)

 - Improve queue dispatch pinning (Ming)

 - Improve the direct list issue code (Keith)

 - BFQ improvements (Jan)

 - Direct completion helper and use it in mmc block (Sebastian)

 - Use raw spinlock for the blktrace code (Wander)

 - fsync error handling fix (Ye)

 - Various fixes and cleanups (Lukas, Randy, Yang, Tetsuo, Ming, me)

* tag 'for-5.17/block-2022-01-11' of git://git.kernel.dk/linux-block: (132 commits)
  MAINTAINERS: add entries for block layer documentation
  docs: block: remove queue-sysfs.rst
  docs: sysfs-block: document virt_boundary_mask
  docs: sysfs-block: document stable_writes
  docs: sysfs-block: fill in missing documentation from queue-sysfs.rst
  docs: sysfs-block: add contact for nomerges
  docs: sysfs-block: sort alphabetically
  docs: sysfs-block: move to stable directory
  block: don't protect submit_bio_checks by q_usage_counter
  block: fix old-style declaration
  nvme-pci: fix queue_rqs list splitting
  block: introduce rq_list_move
  block: introduce rq_list_for_each_safe macro
  block: move rq_list macros to blk-mq.h
  block: drop needless assignment in set_task_ioprio()
  block: remove unnecessary trailing '\'
  bio.h: fix kernel-doc warnings
  block: check minor range in device_add_disk()
  block: use "unsigned long" for blk_validate_block_size().
  block: fix error unwinding in device_add_disk
  ...

1 files changed, 8 insertions, 16 deletions

diff --git a/block/bdev.c b/block/bdev.c
index b1d087e5e205..8bf93a19041b 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -665,7 +665,7 @@ static void blkdev_flush_mapping(struct block_device *bdev)
 static int blkdev_get_whole(struct block_device *bdev, fmode_t mode)
 {
 	struct gendisk *disk = bdev->bd_disk;
-	int ret = 0;
+	int ret;
 
 	if (disk->fops->open) {
 		ret = disk->fops->open(bdev, mode);
@@ -750,14 +750,6 @@ struct block_device *blkdev_get_no_open(dev_t dev)
 	if (!kobject_get_unless_zero(&bdev->bd_device.kobj))
 		bdev = NULL;
 	iput(inode);
-
-	if (!bdev)
-		return NULL;
-	if ((bdev->bd_disk->flags & GENHD_FL_HIDDEN)) {
-		put_device(&bdev->bd_device);
-		return NULL;
-	}
-
 	return bdev;
 }
 
@@ -837,7 +829,7 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder)
 		 * used in blkdev_get/put().
 		 */
 		if ((mode & FMODE_WRITE) && !bdev->bd_write_holder &&
-		    (disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE)) {
+		    (disk->event_flags & DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE)) {
 			bdev->bd_write_holder = true;
 			unblock_events = false;
 		}
@@ -963,15 +955,15 @@ void blkdev_put(struct block_device *bdev, fmode_t mode)
 EXPORT_SYMBOL(blkdev_put);
 
 /**
- * lookup_bdev  - lookup a struct block_device by name
- * @pathname:	special file representing the block device
- * @dev:	return value of the block device's dev_t
+ * lookup_bdev() - Look up a struct block_device by name.
+ * @pathname: Name of the block device in the filesystem.
+ * @dev: Pointer to the block device's dev_t, if found.
  *
  * Lookup the block device's dev_t at @pathname in the current
- * namespace if possible and return it by @dev.
+ * namespace if possible and return it in @dev.
  *
- * RETURNS:
- * 0 if succeeded, errno otherwise.
+ * Context: May sleep.
+ * Return: 0 if succeeded, negative errno otherwise.
  */
 int lookup_bdev(const char *pathname, dev_t *dev)
 {