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@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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,
 };

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;