linux-kernel - Re: [PATCH 1/3] cdrom: remove the unused driver specific disc change ioctl

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Date:   Fri, 29 Apr 2022 00:28:45 +0100
From:   Phillip Potter <phil@...lpotter.co.uk>
To:     Paul Gortmaker <paul.gortmaker@...driver.com>
Cc:     linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org
Subject: Re: [PATCH 1/3] cdrom: remove the unused driver specific disc change
 ioctl

On Wed, Apr 27, 2022 at 09:24:33AM -0400, Paul Gortmaker wrote:
> This was only used by the ide-cd driver, which went away in
> commit b7fb14d3ac63 ("ide: remove the legacy ide driver")
> so we might as well take advantage of that and get rid of
> this hook as well.
> 
> Cc: Christoph Hellwig <hch@....de>
> Cc: Jens Axboe <axboe@...nel.dk>
> Cc: Phillip Potter <phil@...lpotter.co.uk>
> Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
>  Documentation/cdrom/cdrom-standard.rst | 10 ----------
>  drivers/cdrom/cdrom.c                  |  8 --------
>  include/linux/cdrom.h                  |  1 -
>  3 files changed, 19 deletions(-)
> 
> diff --git a/Documentation/cdrom/cdrom-standard.rst b/Documentation/cdrom/cdrom-standard.rst
> index 52ea7b6b2fe8..7964fe134277 100644
> --- a/Documentation/cdrom/cdrom-standard.rst
> +++ b/Documentation/cdrom/cdrom-standard.rst
> @@ -218,7 +218,6 @@ current *struct* is::
>  		int (*tray_move)(struct cdrom_device_info *, int);
>  		int (*lock_door)(struct cdrom_device_info *, int);
>  		int (*select_speed)(struct cdrom_device_info *, int);
> -		int (*select_disc)(struct cdrom_device_info *, int);
>  		int (*get_last_session) (struct cdrom_device_info *,
>  					 struct cdrom_multisession *);
>  		int (*get_mcn)(struct cdrom_device_info *, struct cdrom_mcn *);
> @@ -419,15 +418,6 @@ this `auto-selection` capability, the decision should be made on the
>  current disc loaded and the return value should be positive. A negative
>  return value indicates an error.
>  
> -::
> -
> -	int select_disc(struct cdrom_device_info *cdi, int number)
> -
> -If the drive can store multiple discs (a juke-box) this function
> -will perform disc selection. It should return the number of the
> -selected disc on success, a negative value on error. Currently, only
> -the ide-cd driver supports this functionality.
> -
>  ::
>  
>  	int get_last_session(struct cdrom_device_info *cdi,
> diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
> index 2dc9da683a13..0a858bfea849 100644
> --- a/drivers/cdrom/cdrom.c
> +++ b/drivers/cdrom/cdrom.c
> @@ -2443,14 +2443,6 @@ static int cdrom_ioctl_select_disc(struct cdrom_device_info *cdi,
>  			return -EINVAL;
>  	}
>  
> -	/*
> -	 * ->select_disc is a hook to allow a driver-specific way of
> -	 * seleting disc.  However, since there is no equivalent hook for
> -	 * cdrom_slot_status this may not actually be useful...
> -	 */
> -	if (cdi->ops->select_disc)
> -		return cdi->ops->select_disc(cdi, arg);
> -
>  	cd_dbg(CD_CHANGER, "Using generic cdrom_select_disc()\n");
>  	return cdrom_select_disc(cdi, arg);
>  }
> diff --git a/include/linux/cdrom.h b/include/linux/cdrom.h
> index 0a89f111e00e..67caa909e3e6 100644
> --- a/include/linux/cdrom.h
> +++ b/include/linux/cdrom.h
> @@ -77,7 +77,6 @@ struct cdrom_device_ops {
>  	int (*tray_move) (struct cdrom_device_info *, int);
>  	int (*lock_door) (struct cdrom_device_info *, int);
>  	int (*select_speed) (struct cdrom_device_info *, int);
> -	int (*select_disc) (struct cdrom_device_info *, int);
>  	int (*get_last_session) (struct cdrom_device_info *,
>  				 struct cdrom_multisession *);
>  	int (*get_mcn) (struct cdrom_device_info *,
> -- 
> 2.33.0
> 

Hi Paul,

Thanks for the patch, looks good. I'll send onto Jens during the next
merge window.

Signed-off-by: Phillip Potter <phil@...lpotter.co.uk>

Regards,
Phil