[PATCH] ASoC: fsl_spdif: Constify some structures

[Christophe JAILLET]

'struct fsl_spdif_soc_data' and 'struct snd_kcontrol_new' are not modified
in this driver.

Constifying these structures moves some data to a read-only section, so
increases overall security, especially when the structure holds some
function pointers.

On a x86_64, with allmodconfig:
Before:
======
   text    data     bss     dec     hex filename
  53548   25576     128   79252   13594 sound/soc/fsl/fsl_spdif.o

After:
=====
   text    data     bss     dec     hex filename
  54828   24296     128   79252   13594 sound/soc/fsl/fsl_spdif.o

Signed-off-by: Christophe JAILLET <christophe.jail...@wanadoo.fr>
---
 sound/soc/fsl/fsl_spdif.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/sound/soc/fsl/fsl_spdif.c b/sound/soc/fsl/fsl_spdif.c
index ee946e0d3f49..1b9be85b34c2 100644
--- a/sound/soc/fsl/fsl_spdif.c
+++ b/sound/soc/fsl/fsl_spdif.c
@@ -148,7 +148,7 @@ struct fsl_spdif_priv {
        struct clk *pll11k_clk;
 };
 
-static struct fsl_spdif_soc_data fsl_spdif_vf610 = {
+static const struct fsl_spdif_soc_data fsl_spdif_vf610 = {
        .imx = false,
        .shared_root_clock = false,
        .raw_capture_mode = false,
@@ -158,7 +158,7 @@ static struct fsl_spdif_soc_data fsl_spdif_vf610 = {
        .tx_formats = FSL_SPDIF_FORMATS_PLAYBACK,
 };
 
-static struct fsl_spdif_soc_data fsl_spdif_imx35 = {
+static const struct fsl_spdif_soc_data fsl_spdif_imx35 = {
        .imx = true,
        .shared_root_clock = false,
        .raw_capture_mode = false,
@@ -168,7 +168,7 @@ static struct fsl_spdif_soc_data fsl_spdif_imx35 = {
        .tx_formats = FSL_SPDIF_FORMATS_PLAYBACK,
 };
 
-static struct fsl_spdif_soc_data fsl_spdif_imx6sx = {
+static const struct fsl_spdif_soc_data fsl_spdif_imx6sx = {
        .imx = true,
        .shared_root_clock = true,
        .raw_capture_mode = false,
@@ -179,7 +179,7 @@ static struct fsl_spdif_soc_data fsl_spdif_imx6sx = {
 
 };
 
-static struct fsl_spdif_soc_data fsl_spdif_imx8qm = {
+static const struct fsl_spdif_soc_data fsl_spdif_imx8qm = {
        .imx = true,
        .shared_root_clock = true,
        .raw_capture_mode = false,
@@ -189,7 +189,7 @@ static struct fsl_spdif_soc_data fsl_spdif_imx8qm = {
        .tx_formats = SNDRV_PCM_FMTBIT_S24_LE,  /* Applied for EDMA */
 };
 
-static struct fsl_spdif_soc_data fsl_spdif_imx8mm = {
+static const struct fsl_spdif_soc_data fsl_spdif_imx8mm = {
        .imx = true,
        .shared_root_clock = false,
        .raw_capture_mode = true,
@@ -199,7 +199,7 @@ static struct fsl_spdif_soc_data fsl_spdif_imx8mm = {
        .tx_formats = FSL_SPDIF_FORMATS_PLAYBACK,
 };
 
-static struct fsl_spdif_soc_data fsl_spdif_imx8ulp = {
+static const struct fsl_spdif_soc_data fsl_spdif_imx8ulp = {
        .imx = true,
        .shared_root_clock = true,
        .raw_capture_mode = false,
@@ -1146,7 +1146,7 @@ static int fsl_spdif_usync_put(struct snd_kcontrol 
*kcontrol,
 }
 
 /* FSL SPDIF IEC958 controller defines */
-static struct snd_kcontrol_new fsl_spdif_ctrls[] = {
+static const struct snd_kcontrol_new fsl_spdif_ctrls[] = {
        /* Status cchanel controller */
        {
                .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
@@ -1233,7 +1233,7 @@ static struct snd_kcontrol_new fsl_spdif_ctrls[] = {
        },
 };
 
-static struct snd_kcontrol_new fsl_spdif_ctrls_rcm[] = {
+static const struct snd_kcontrol_new fsl_spdif_ctrls_rcm[] = {
        {
                .iface = SNDRV_CTL_ELEM_IFACE_PCM,
                .name = "IEC958 Raw Capture Mode",
-- 
2.51.1