Re: [PATCH 08/30] mspro: use blk_mq_alloc_disk

Ulf Hansson
2021-06-03T15:38:30Z

On Wed, 2 Jun 2021 at 08:54, Christoph Hellwig <hch@lst.de> wrote:
>
> Use the blk_mq_alloc_disk API to simplify the gendisk and request_queue
> allocation.
>
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Acked-by: Ulf Hansson <ulf.hansson@linaro.org>

Kind regards
Uffe

> ---
> drivers/memstick/core/mspro_block.c | 26 +++++++++++---------------
> 1 file changed, 11 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/memstick/core/mspro_block.c b/drivers/memstick/core/mspro_block.c
> index cf7fe0d58ee7..22778d0e24f5 100644
> --- a/drivers/memstick/core/mspro_block.c
> +++ b/drivers/memstick/core/mspro_block.c
> @@ -1205,21 +1205,17 @@ static int mspro_block_init_disk(struct memstick_dev *card)
> if (disk_id < 0)
> return disk_id;
>
> - msb->disk = alloc_disk(1 << MSPRO_BLOCK_PART_SHIFT);
> - if (!msb->disk) {
> - rc = -ENOMEM;
> + rc = blk_mq_alloc_sq_tag_set(&msb->tag_set, &mspro_mq_ops, 2,
> + BLK_MQ_F_SHOULD_MERGE);
> + if (rc)
> goto out_release_id;
> - }
>
> - msb->queue = blk_mq_init_sq_queue(&msb->tag_set, &mspro_mq_ops, 2,
> - BLK_MQ_F_SHOULD_MERGE);
> - if (IS_ERR(msb->queue)) {
> - rc = PTR_ERR(msb->queue);
> - msb->queue = NULL;
> - goto out_put_disk;
> + msb->disk = blk_mq_alloc_disk(&msb->tag_set, card);
> + if (IS_ERR(msb->disk)) {
> + rc = PTR_ERR(msb->disk);
> + goto out_free_tag_set;
> }
> -
> - msb->queue->queuedata = card;
> + msb->queue = msb->disk->queue;
>
> blk_queue_max_hw_sectors(msb->queue, MSPRO_BLOCK_MAX_PAGES);
> blk_queue_max_segments(msb->queue, MSPRO_BLOCK_MAX_SEGS);
> @@ -1228,10 +1224,10 @@ static int mspro_block_init_disk(struct memstick_dev *card)
>
> msb->disk->major = major;
> msb->disk->first_minor = disk_id << MSPRO_BLOCK_PART_SHIFT;
> + msb->disk->minors = 1 << MSPRO_BLOCK_PART_SHIFT;
> msb->disk->fops = &ms_block_bdops;
> msb->usage_count = 1;
> msb->disk->private_data = msb;
> - msb->disk->queue = msb->queue;
>
> sprintf(msb->disk->disk_name, "mspblk%d", disk_id);
>
> @@ -1247,8 +1243,8 @@ static int mspro_block_init_disk(struct memstick_dev *card)
> msb->active = 1;
> return 0;
>
> -out_put_disk:
> - put_disk(msb->disk);
> +out_free_tag_set:
> + blk_mq_free_tag_set(&msb->tag_set);
> out_release_id:
> mutex_lock(&mspro_block_disk_lock);
> idr_remove(&mspro_block_disk_idr, disk_id);
> --
> 2.30.2
>