[PATCH] ASoC: renesas: fsi: Constify struct fsi_stream_handler

[Christophe JAILLET]

'struct fsi_stream_handler' is not modified in this driver.

Constifying this structure 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
  51837	  12312	     64	  64213	   fad5	sound/soc/renesas/fsi.o

After:
=====
   text	   data	    bss	    dec	    hex	filename
  52125	  12024	     64	  64213	   fad5	sound/soc/renesas/fsi.o

Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
---
 sound/soc/renesas/fsi.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/sound/soc/renesas/fsi.c b/sound/soc/renesas/fsi.c
index 630c2f52e1cf..1491c2f2cc96 100644
--- a/sound/soc/renesas/fsi.c
+++ b/sound/soc/renesas/fsi.c
@@ -220,7 +220,7 @@ struct fsi_stream {
 	/*
 	 * these are initialized by fsi_handler_init()
 	 */
-	struct fsi_stream_handler *handler;
+	const struct fsi_stream_handler *handler;
 	struct fsi_priv		*priv;
 
 	/*
@@ -1215,13 +1215,13 @@ static int fsi_pio_pop_init(struct fsi_priv *fsi, struct fsi_stream *io)
 	return 0;
 }
 
-static struct fsi_stream_handler fsi_pio_push_handler = {
+static const struct fsi_stream_handler fsi_pio_push_handler = {
 	.init		= fsi_pio_push_init,
 	.transfer	= fsi_pio_push,
 	.start_stop	= fsi_pio_start_stop,
 };
 
-static struct fsi_stream_handler fsi_pio_pop_handler = {
+static const struct fsi_stream_handler fsi_pio_pop_handler = {
 	.init		= fsi_pio_pop_init,
 	.transfer	= fsi_pio_pop,
 	.start_stop	= fsi_pio_start_stop,
@@ -1418,7 +1418,7 @@ static int fsi_dma_remove(struct fsi_priv *fsi, struct fsi_stream *io)
 	return 0;
 }
 
-static struct fsi_stream_handler fsi_dma_push_handler = {
+static const struct fsi_stream_handler fsi_dma_push_handler = {
 	.init		= fsi_dma_init,
 	.probe		= fsi_dma_probe,
 	.transfer	= fsi_dma_transfer,
-- 
2.51.0