[dm-devel] [RFC PATCH] blk-core: remove blk_put_request()

[Stefan Hajnoczi]

On Mon, Feb 22, 2021 at 01:11:15PM -0800, Chaitanya Kulkarni wrote:
> The function blk_put_request() is just a wrapper to
> blk_mq_free_request(), remove the unnecessary wrapper.
> 
> Any feedback is welcome on this RFC.
> 
> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
> ---
>  block/blk-core.c                   |  6 ------
>  block/blk-merge.c                  |  2 +-
>  block/bsg-lib.c                    |  4 ++--
>  block/bsg.c                        |  4 ++--
>  block/scsi_ioctl.c                 |  6 +++---
>  drivers/block/paride/pd.c          |  2 +-
>  drivers/block/pktcdvd.c            |  2 +-
>  drivers/block/virtio_blk.c         |  2 +-
>  drivers/cdrom/cdrom.c              |  4 ++--
>  drivers/ide/ide-atapi.c            |  2 +-
>  drivers/ide/ide-cd.c               |  4 ++--
>  drivers/ide/ide-cd_ioctl.c         |  2 +-
>  drivers/ide/ide-devsets.c          |  2 +-
>  drivers/ide/ide-disk.c             |  2 +-
>  drivers/ide/ide-ioctls.c           |  4 ++--
>  drivers/ide/ide-park.c             |  2 +-
>  drivers/ide/ide-pm.c               |  4 ++--
>  drivers/ide/ide-tape.c             |  2 +-
>  drivers/ide/ide-taskfile.c         |  2 +-
>  drivers/md/dm-mpath.c              |  2 +-
>  drivers/mmc/core/block.c           | 10 +++++-----
>  drivers/scsi/scsi_error.c          |  2 +-
>  drivers/scsi/scsi_lib.c            |  2 +-
>  drivers/scsi/sg.c                  |  6 +++---
>  drivers/scsi/st.c                  |  4 ++--
>  drivers/scsi/ufs/ufshcd.c          |  6 +++---
>  drivers/target/target_core_pscsi.c |  4 ++--
>  fs/nfsd/blocklayout.c              |  4 ++--
>  include/linux/blkdev.h             |  1 -
>  29 files changed, 46 insertions(+), 53 deletions(-)
> 
> diff --git a/block/blk-core.c b/block/blk-core.c
> index fc60ff208497..1754f5e7cc80 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -642,12 +642,6 @@ struct request *blk_get_request(struct request_queue *q, unsigned int op,
>  }
>  EXPORT_SYMBOL(blk_get_request);
>  
> -void blk_put_request(struct request *req)
> -{
> -	blk_mq_free_request(req);
> -}
> -EXPORT_SYMBOL(blk_put_request);

blk_get_request() still exists after this patch. A "get" API usually has
a corresponding "put" API. I'm not sure this patch helps the consistency
and clarity of the code.

If you do go ahead, please update the blk_get_request() doc comment
explicitly mentioning that blk_mq_free_request() needs to be called.

Stefan
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