Re: [PATCH] st-delta: constify vb2_ops structures

[Hugues FRUCHET <hugues.fruchet@st.com>]

Acked-by: Hugues Fruchet <hugues.fruchet@st.com>

On 07/06/2017 10:14 PM, 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@embeddedor.com>
> ---
>   drivers/media/platform/sti/delta/delta-v4l2.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/sti/delta/delta-v4l2.c b/drivers/media/platform/sti/delta/delta-v4l2.c
> index c6f2e24..ff9850e 100644
> --- a/drivers/media/platform/sti/delta/delta-v4l2.c
> +++ b/drivers/media/platform/sti/delta/delta-v4l2.c
> @@ -1574,7 +1574,7 @@ static void delta_vb2_frame_stop_streaming(struct vb2_queue *q)
>   }
>   
>   /* VB2 queue ops */
> -static struct vb2_ops delta_vb2_au_ops = {
> +static const struct vb2_ops delta_vb2_au_ops = {
>   	.queue_setup = delta_vb2_au_queue_setup,
>   	.buf_prepare = delta_vb2_au_prepare,
>   	.buf_queue = delta_vb2_au_queue,
> @@ -1584,7 +1584,7 @@ static struct vb2_ops delta_vb2_au_ops = {
>   	.stop_streaming = delta_vb2_au_stop_streaming,
>   };
>   
> -static struct vb2_ops delta_vb2_frame_ops = {
> +static const struct vb2_ops delta_vb2_frame_ops = {
>   	.queue_setup = delta_vb2_frame_queue_setup,
>   	.buf_prepare = delta_vb2_frame_prepare,
>   	.buf_finish = delta_vb2_frame_finish,
>