linux-kernel - Re: [PATCH] rcar_fdp1: constify vb2

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Date:   Thu, 6 Jul 2017 23:41:12 +0100
From:   Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rcar_fdp1: constify vb2_ops structure

Hi Gustavo,

Thank you for the patch.

On 06/07/17 21:25, Gustavo A. R. Silva wrote:
> Check for vb2_ops structures that are only stored in the ops field of a
> vb2_queue structure. That field is declared const, so vb2_ops structures
> that have this property can be declared as const also.
> 
> This issue was detected using Coccinelle and the following semantic patch:
> 
> @r disable optional_qualifier@
> identifier i;
> position p;
> @@
> static struct vb2_ops i@p = { ... };
> 
> @ok@
> identifier r.i;
> struct vb2_queue e;
> position p;
> @@
> e.ops = &i@p;
> 
> @bad@
> position p != {r.p,ok.p};
> identifier r.i;
> struct vb2_ops e;
> @@
> e@i@p
> 
> @depends on !bad disable optional_qualifier@
> identifier r.i;
> @@
> static
> +const
> struct vb2_ops i = { ... };
> 
> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>

> ---
>  drivers/media/platform/rcar_fdp1.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/rcar_fdp1.c b/drivers/media/platform/rcar_fdp1.c
> index 3ee51fc..3245bc4 100644
> --- a/drivers/media/platform/rcar_fdp1.c
> +++ b/drivers/media/platform/rcar_fdp1.c
> @@ -2032,7 +2032,7 @@ static void fdp1_stop_streaming(struct vb2_queue *q)
>  	}
>  }
>  
> -static struct vb2_ops fdp1_qops = {
> +static const struct vb2_ops fdp1_qops = {
>  	.queue_setup	 = fdp1_queue_setup,
>  	.buf_prepare	 = fdp1_buf_prepare,
>  	.buf_queue	 = fdp1_buf_queue,
>