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From: Ulf Hansson <ulf.hansson@linaro.org>
Date: Thu, 3 Jun 2021 17:36:45 +0200
Message-ID: <CAPDyKFoh6HKx2rHHRXvw--Ou53TR2wLFGrKCDuetigxQ8QbvfQ@mail.gmail.com>
Subject: Re: [PATCH 08/30] mspro: use blk_mq_alloc_disk
To: Christoph Hellwig <hch@lst.de>
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 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

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
>