linux-kernel - [PATCH 2/5] [media] atomisp: constify videobuf_queue

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Date:   Fri,  4 Aug 2017 14:09:45 +0200
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     bhumirks@...il.com, kernel-janitors@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-media@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/5] [media] atomisp: constify videobuf_queue_ops structures

These videobuf_queue_ops structures are only passed as the second
argument to videobuf_queue_vmalloc_init, which is declared as const.
Thus the videobuf_queue_ops structures themselves can be const.

Done with the help of Coccinelle.

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct videobuf_queue_ops i@p = { ... };

@ok1@
identifier r.i;
expression e1;
position p;
@@
videobuf_queue_vmalloc_init(e1,&i@p,...)

@bad@
position p != {r.p,ok1.p};
identifier r.i;
struct videobuf_queue_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct videobuf_queue_ops i = { ... };
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/staging/media/atomisp/pci/atomisp2/atomisp_fops.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/atomisp_fops.c b/drivers/staging/media/atomisp/pci/atomisp2/atomisp_fops.c
index c151c84..d8cfed3 100644
--- a/drivers/staging/media/atomisp/pci/atomisp2/atomisp_fops.c
+++ b/drivers/staging/media/atomisp/pci/atomisp2/atomisp_fops.c
@@ -643,14 +643,14 @@ static void atomisp_buf_release_output(struct videobuf_queue *vq,
 	vb->state = VIDEOBUF_NEEDS_INIT;
 }
 
-static struct videobuf_queue_ops videobuf_qops = {
+static const struct videobuf_queue_ops videobuf_qops = {
 	.buf_setup	= atomisp_buf_setup,
 	.buf_prepare	= atomisp_buf_prepare,
 	.buf_queue	= atomisp_buf_queue,
 	.buf_release	= atomisp_buf_release,
 };
 
-static struct videobuf_queue_ops videobuf_qops_output = {
+static const struct videobuf_queue_ops videobuf_qops_output = {
 	.buf_setup	= atomisp_buf_setup_output,
 	.buf_prepare	= atomisp_buf_prepare_output,
 	.buf_queue	= atomisp_buf_queue_output,