ASoC: renesas: fsi: Constify struct fsi_stream_handler

'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@wanadoo.fr>
Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Link: https://patch.msgid.link/88ca34df9006b74a7596b91714e700bcff666c4b.1761507792.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/sound/soc/renesas/fsi.c b/sound/soc/renesas/fsi.c
index 630c2f52e1cf58ba37a4f3ecbfa94bb2d6d78e31..1491c2f2cc961d06a8a53984cc424e1c612b5052 100644 (file)
--- 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,