linux-kernel - Re: [PATCH 2/9] media: cedrus: Add wrappers around container

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Date:   Thu, 21 Jun 2018 11:03:11 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Maxime Ripard <maxime.ripard@...tlin.com>, hans.verkuil@...co.com,
        acourbot@...omium.org, sakari.ailus@...ux.intel.com,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc:     tfiga@...omium.org, posciak@...omium.org,
        Chen-Yu Tsai <wens@...e.org>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        nicolas.dufresne@...labora.com, jenskuske@...il.com,
        linux-sunxi@...glegroups.com,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 2/9] media: cedrus: Add wrappers around container_of for
 our buffers

Hi,

On Wed, 2018-06-13 at 16:07 +0200, Maxime Ripard wrote:
> The cedrus driver sub-classes the vb2_v4l2_buffer structure, but doesn't
> provide any function to wrap around the proper container_of call that needs
> to be duplicated in every calling site.
> 
> Add wrappers to make sure its opaque to the users and they don't have to
> care anymore.
> 
> Signed-off-by: Maxime Ripard <maxime.ripard@...tlin.com>
> ---
>  .../platform/sunxi/cedrus/sunxi_cedrus_common.h      | 12 ++++++++++++
>  .../media/platform/sunxi/cedrus/sunxi_cedrus_hw.c    |  4 ++--
>  2 files changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_common.h b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_common.h
> index ee6883ef9cb7..b1ed1c8cb130 100644
> --- a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_common.h
> +++ b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_common.h
> @@ -89,6 +89,18 @@ struct sunxi_cedrus_buffer {
>  	struct list_head list;
>  };
>  
> +static inline

I'm not a big fan of spreading the type qualifiers on two distinct lines
instead of having a longer single line (reminds me of the GNU coding
style a bit), but this is purely cosmetic.

Cheers,

Paul

> +struct sunxi_cedrus_buffer *vb2_v4l2_to_cedrus_buffer(const struct vb2_v4l2_buffer *p)
> +{
> +	return container_of(p, struct sunxi_cedrus_buffer, vb);
> +}
> +
> +static inline
> +struct sunxi_cedrus_buffer *vb2_to_cedrus_buffer(const struct vb2_buffer *p)
> +{
> +	return vb2_v4l2_to_cedrus_buffer(to_vb2_v4l2_buffer(p));
> +}
> +
>  struct sunxi_cedrus_dev {
>  	struct v4l2_device v4l2_dev;
>  	struct video_device vfd;
> diff --git a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_hw.c b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_hw.c
> index 5783bd985855..fc688a5c1ea3 100644
> --- a/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_hw.c
> +++ b/drivers/media/platform/sunxi/cedrus/sunxi_cedrus_hw.c
> @@ -108,8 +108,8 @@ static irqreturn_t sunxi_cedrus_ve_irq(int irq, void *dev_id)
>  		return IRQ_HANDLED;
>  	}
>  
> -	src_buffer = container_of(src_vb, struct sunxi_cedrus_buffer, vb);
> -	dst_buffer = container_of(dst_vb, struct sunxi_cedrus_buffer, vb);
> +	src_buffer = vb2_v4l2_to_cedrus_buffer(src_vb);
> +	dst_buffer = vb2_v4l2_to_cedrus_buffer(dst_vb);
>  
>  	/* First bit of MPEG_STATUS indicates success. */
>  	if (ctx->job_abort || !(status & 0x01))
-- 
Paul Kocialkowski, Bootlin (formerly Free Electrons)
Embedded Linux and kernel engineering
https://bootlin.com
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