linux-kernel - Re: [PATCH 2/4] staging: vc04_services: avoid the use of typedef for function pointers

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Date:   Tue, 21 Dec 2021 07:19:45 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Gaston Gonzalez <gascoar@...il.com>
Cc:     linux-staging@...ts.linux.dev, nsaenz@...nel.org,
        f.fainelli@...il.com, rjui@...adcom.com, sbranden@...adcom.com,
        bcm-kernel-feedback-list@...adcom.com,
        juerg.haefliger@...onical.com, rdunlap@...radead.org,
        dave.stevenson@...pberrypi.com, stefan.wahren@...e.com,
        unixbhaskar@...il.com, mitaliborkar810@...il.com,
        phil@...pberrypi.com, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] staging: vc04_services: avoid the use of typedef for
 function pointers

On Mon, Dec 20, 2021 at 06:29:12PM -0300, Gaston Gonzalez wrote:
> Replace typedef bm2835_mmal_v4l2_ctrl_cb with equivalent declaration to
> better align with the linux kernel coding style.
> 
> Signed-off-by: Gaston Gonzalez <gascoar@...il.com>
> ---
>  .../vc04_services/bcm2835-camera/controls.c   | 76 +++++++++----------
>  1 file changed, 35 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/staging/vc04_services/bcm2835-camera/controls.c b/drivers/staging/vc04_services/bcm2835-camera/controls.c
> index b096a12387f7..7782742396fc 100644
> --- a/drivers/staging/vc04_services/bcm2835-camera/controls.c
> +++ b/drivers/staging/vc04_services/bcm2835-camera/controls.c
> @@ -65,13 +65,6 @@ enum bm2835_mmal_ctrl_type {
>  	MMAL_CONTROL_TYPE_CLUSTER, /* special cluster entry */
>  };
>  
> -struct bm2835_mmal_v4l2_ctrl;
> -
> -typedef	int(bm2835_mmal_v4l2_ctrl_cb)(
> -				struct bm2835_mmal_dev *dev,
> -				struct v4l2_ctrl *ctrl,
> -				const struct bm2835_mmal_v4l2_ctrl *mmal_ctrl);

Function pointer typedefs are ok, if they are needed.

> -
>  struct bm2835_mmal_v4l2_ctrl {
>  	u32 id; /* v4l2 control identifier */
>  	enum bm2835_mmal_ctrl_type type;
> @@ -84,7 +77,8 @@ struct bm2835_mmal_v4l2_ctrl {
>  	u64 step; /* step size of the control */
>  	const s64 *imenu; /* integer menu array */
>  	u32 mmal_id; /* mmal parameter id */
> -	bm2835_mmal_v4l2_ctrl_cb *setter;
> +	int (*bm2835_mmal_v4l2_ctrl_cb)(struct bm2835_mmal_dev *dev, struct v4l2_ctrl *ctrl,
> +					const struct bm2835_mmal_v4l2_ctrl *mmal_ctrl);

No need to rename this function pointer, why not keep it at "setter"?
That would make this patch much smaller and more obvious.

thanks,

greg k-h