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loop: use blk_mq_alloc_disk and blk_cleanup_disk

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Use blk_mq_alloc_disk and blk_cleanup_disk to simplify the gendisk and
request_queue allocation.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Link: https://lore.kernel.org/r/20210602065345.355274-19-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-06-02 09:53:33 +03:00 committed by Jens Axboe
parent 34f84aefe2
commit 1c99502fae
1 changed files with 6 additions and 13 deletions
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19
drivers/block/loop.c
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@ -2117,12 +2117,12 @@ static int loop_add(struct loop_device **l, int i)
if (err)
goto out_free_idr;
lo->lo_queue = blk_mq_init_queue(&lo->tag_set);
if (IS_ERR(lo->lo_queue)) {
err = PTR_ERR(lo->lo_queue);
disk = lo->lo_disk = blk_mq_alloc_disk(&lo->tag_set, lo);
if (IS_ERR(disk)) {
err = PTR_ERR(disk);
goto out_cleanup_tags;
}
lo->lo_queue->queuedata = lo;
lo->lo_queue = lo->lo_disk->queue;
blk_queue_max_hw_sectors(lo->lo_queue, BLK_DEF_MAX_SECTORS);
@ -2134,11 +2134,6 @@ static int loop_add(struct loop_device **l, int i)
*/
blk_queue_flag_set(QUEUE_FLAG_NOMERGES, lo->lo_queue);
err = -ENOMEM;
disk = lo->lo_disk = alloc_disk(1 << part_shift);
if (!disk)
goto out_free_queue;
/*
* Disable partition scanning by default. The in-kernel partition
* scanning can be requested individually per-device during its
@ -2166,6 +2161,7 @@ static int loop_add(struct loop_device **l, int i)
spin_lock_init(&lo->lo_lock);
disk->major = LOOP_MAJOR;
disk->first_minor = i << part_shift;
disk->minors = 1 << part_shift;
disk->fops = &lo_fops;
disk->private_data = lo;
disk->queue = lo->lo_queue;
@ -2174,8 +2170,6 @@ static int loop_add(struct loop_device **l, int i)
*l = lo;
return lo->lo_number;
out_free_queue:
blk_cleanup_queue(lo->lo_queue);
out_cleanup_tags:
blk_mq_free_tag_set(&lo->tag_set);
out_free_idr:
@ -2189,9 +2183,8 @@ out:
static void loop_remove(struct loop_device *lo)
{
del_gendisk(lo->lo_disk);
blk_cleanup_queue(lo->lo_queue);
blk_mq_free_tag_set(&lo->tag_set);
put_disk(lo->lo_disk);
blk_cleanup_disk(lo->lo_disk);
mutex_destroy(&lo->lo_mutex);
kfree(lo);
}