linux-kernel - Re: [PATCH] [media] usb: constify vb2

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Date:   Fri, 09 Sep 2016 11:43:12 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Julia Lawall <Julia.Lawall@...6.fr>
Cc:     kernel-janitors@...r.kernel.org,
        Hans Verkuil <hans.verkuil@...co.com>,
        Antti Palosaari <crope@....fi>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Hans Verkuil <hverkuil@...all.nl>,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
Subject: Re: [PATCH] [media] usb: constify vb2_ops structures

Hi Julia,

Thank you for the patch.

On Friday 09 Sep 2016 01:59:01 Julia Lawall 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.
> 
> The semantic patch that makes this change is as follows:
> (http://coccinelle.lip6.fr/)
> 
> // <smpl>
> @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 = { ... };
> // </smpl>
> 
> Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

For

>  drivers/media/usb/uvc/uvc_queue.c       |    2 +-

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

-- 
Regards,

Laurent Pinchart