linux-kernel - [PATCH] media: s5p-jpeg: Constify struct v4l2_m2m

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Message-Id: <20211130212700.1253521-1-rikard.falkeborn@gmail.com>
Date:   Tue, 30 Nov 2021 22:27:00 +0100
From:   Rikard Falkeborn <rikard.falkeborn@...il.com>
To:     Andrzej Pietrasiewicz <andrzejtp2010@...il.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Rikard Falkeborn <rikard.falkeborn@...il.com>
Subject: [PATCH] media: s5p-jpeg: Constify struct v4l2_m2m_ops

The only usage of the v4l2_m2m_ops structs is to pass their address to
v4l2_m2m_init() which takes a pointer to const struct v4l2_m2m_ops as
argument. Make them const to allow the compiler to put them in read-only
memory.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@...il.com>
---
 drivers/media/platform/s5p-jpeg/jpeg-core.c | 6 +++---
 drivers/media/platform/s5p-jpeg/jpeg-core.h | 2 +-
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.c b/drivers/media/platform/s5p-jpeg/jpeg-core.c
index ebdfd24e9cd5..a8d9159d5ed8 100644
--- a/drivers/media/platform/s5p-jpeg/jpeg-core.c
+++ b/drivers/media/platform/s5p-jpeg/jpeg-core.c
@@ -2425,17 +2425,17 @@ static int s5p_jpeg_job_ready(void *priv)
 	return 1;
 }
 
-static struct v4l2_m2m_ops s5p_jpeg_m2m_ops = {
+static const struct v4l2_m2m_ops s5p_jpeg_m2m_ops = {
 	.device_run	= s5p_jpeg_device_run,
 	.job_ready	= s5p_jpeg_job_ready,
 };
 
-static struct v4l2_m2m_ops exynos3250_jpeg_m2m_ops = {
+static const struct v4l2_m2m_ops exynos3250_jpeg_m2m_ops = {
 	.device_run	= exynos3250_jpeg_device_run,
 	.job_ready	= s5p_jpeg_job_ready,
 };
 
-static struct v4l2_m2m_ops exynos4_jpeg_m2m_ops = {
+static const struct v4l2_m2m_ops exynos4_jpeg_m2m_ops = {
 	.device_run	= exynos4_jpeg_device_run,
 	.job_ready	= s5p_jpeg_job_ready,
 };
diff --git a/drivers/media/platform/s5p-jpeg/jpeg-core.h b/drivers/media/platform/s5p-jpeg/jpeg-core.h
index 8473a019bb5f..4a5fb1b15455 100644
--- a/drivers/media/platform/s5p-jpeg/jpeg-core.h
+++ b/drivers/media/platform/s5p-jpeg/jpeg-core.h
@@ -142,7 +142,7 @@ struct s5p_jpeg_variant {
 	unsigned int		hw3250_compat:1;
 	unsigned int		htbl_reinit:1;
 	unsigned int		hw_ex4_compat:1;
-	struct v4l2_m2m_ops	*m2m_ops;
+	const struct v4l2_m2m_ops *m2m_ops;
 	irqreturn_t		(*jpeg_irq)(int irq, void *priv);
 	const char		*clk_names[JPEG_MAX_CLOCKS];
 	int			num_clocks;
-- 
2.34.1