[PATCH 04/30] virtio-blk: use blk_mq_alloc_disk

[Christoph Hellwig <hch@xxxxxx>]

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

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 drivers/block/virtio_blk.c | 26 +++++++-------------------
 1 file changed, 7 insertions(+), 19 deletions(-)

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index b9fa3ef5b57c..e4bd3b1fc3c2 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -749,13 +749,6 @@ static int virtblk_probe(struct virtio_device *vdev)
        if (err)
                goto out_free_vblk;
 
-       /* FIXME: How many partitions?  How long is a piece of string? */
-       vblk->disk = alloc_disk(1 << PART_BITS);
-       if (!vblk->disk) {
-               err = -ENOMEM;
-               goto out_free_vq;
-       }
-
        /* Default queue sizing is to fill the ring. */
        if (likely(!virtblk_queue_depth)) {
                queue_depth = vblk->vqs[0].vq->num_free;
@@ -779,21 +772,20 @@ static int virtblk_probe(struct virtio_device *vdev)
 
        err = blk_mq_alloc_tag_set(&vblk->tag_set);
        if (err)
-               goto out_put_disk;
+               goto out_free_vq;
 
-       q = blk_mq_init_queue(&vblk->tag_set);
-       if (IS_ERR(q)) {
-               err = -ENOMEM;
+       vblk->disk = blk_mq_alloc_disk(&vblk->tag_set, vblk);
+       if (IS_ERR(vblk->disk)) {
+               err = PTR_ERR(vblk->disk);
                goto out_free_tags;
        }
-       vblk->disk->queue = q;
-
-       q->queuedata = vblk;
+       q = vblk->disk->queue;
 
        virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN);
 
        vblk->disk->major = major;
        vblk->disk->first_minor = index_to_minor(index);
+       vblk->disk->minors = 1 << PART_BITS;
        vblk->disk->private_data = vblk;
        vblk->disk->fops = &virtblk_fops;
        vblk->disk->flags |= GENHD_FL_EXT_DEVT;
@@ -892,8 +884,6 @@ static int virtblk_probe(struct virtio_device *vdev)
 
 out_free_tags:
        blk_mq_free_tag_set(&vblk->tag_set);
-out_put_disk:
-       put_disk(vblk->disk);
 out_free_vq:
        vdev->config->del_vqs(vdev);
        kfree(vblk->vqs);
@@ -913,8 +903,7 @@ static void virtblk_remove(struct virtio_device *vdev)
        flush_work(&vblk->config_work);
 
        del_gendisk(vblk->disk);
-       blk_cleanup_queue(vblk->disk->queue);
-
+       blk_cleanup_disk(vblk->disk);
        blk_mq_free_tag_set(&vblk->tag_set);
 
        mutex_lock(&vblk->vdev_mutex);
@@ -925,7 +914,6 @@ static void virtblk_remove(struct virtio_device *vdev)
        /* Virtqueues are stopped, nothing can use vblk->vdev anymore. */
        vblk->vdev = NULL;
 
-       put_disk(vblk->disk);
        vdev->config->del_vqs(vdev);
        kfree(vblk->vqs);
 
-- 
2.30.2