linux-kernel - [PATCH 08/12] [media] m2m-deinterlace: constify v4l2_m2m

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Message-Id: <1502007921-22968-9-git-send-email-Julia.Lawall@lip6.fr>
Date:   Sun,  6 Aug 2017 10:25:17 +0200
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     bhumirks@...il.com, kernel-janitors@...r.kernel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 08/12] [media] m2m-deinterlace: constify v4l2_m2m_ops structures

The v4l2_m2m_ops structures are only passed as the only
argument to v4l2_m2m_init, which is declared as const.
Thus the v4l2_m2m_ops structures themselves can be const.

Done with the help of Coccinelle.

// <smpl>
@r disable optional_qualifier@
identifier i;
position p;
@@
static struct v4l2_m2m_ops i@p = { ... };

@ok1@
identifier r.i;
position p;
@@
v4l2_m2m_init(&i@p)

@bad@
position p != {r.p,ok1.p};
identifier r.i;
struct v4l2_m2m_ops e;
@@
e@i@p

@depends on !bad disable optional_qualifier@
identifier r.i;
@@
static
+const
 struct v4l2_m2m_ops i = { ... };
// </smpl>

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

---
 drivers/media/platform/m2m-deinterlace.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/m2m-deinterlace.c b/drivers/media/platform/m2m-deinterlace.c
index 980066b..98f6db2 100644
--- a/drivers/media/platform/m2m-deinterlace.c
+++ b/drivers/media/platform/m2m-deinterlace.c
@@ -988,7 +988,7 @@ static int deinterlace_mmap(struct file *file, struct vm_area_struct *vma)
 	.vfl_dir	= VFL_DIR_M2M,
 };
 
-static struct v4l2_m2m_ops m2m_ops = {
+static const struct v4l2_m2m_ops m2m_ops = {
 	.device_run	= deinterlace_device_run,
 	.job_ready	= deinterlace_job_ready,
 	.job_abort	= deinterlace_job_abort,