ALSA: Constify the snd_pcm_substream struct ops field
The ops field of the snd_pcm_substream struct is never modified inside the ALSA
core. Making it const allows drivers to declare their snd_pcm_ops struct as
const.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index b48792f..84b10f9 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -384,7 +384,7 @@
unsigned int dma_buf_id;
size_t dma_max;
/* -- hardware operations -- */
- struct snd_pcm_ops *ops;
+ const struct snd_pcm_ops *ops;
/* -- runtime information -- */
struct snd_pcm_runtime *runtime;
/* -- timer section -- */
@@ -871,7 +871,8 @@
int snd_pcm_format_set_silence(snd_pcm_format_t format, void *buf, unsigned int frames);
snd_pcm_format_t snd_pcm_build_linear_format(int width, int unsigned, int big_endian);
-void snd_pcm_set_ops(struct snd_pcm * pcm, int direction, struct snd_pcm_ops *ops);
+void snd_pcm_set_ops(struct snd_pcm * pcm, int direction,
+ const struct snd_pcm_ops *ops);
void snd_pcm_set_sync(struct snd_pcm_substream *substream);
int snd_pcm_lib_interleave_len(struct snd_pcm_substream *substream);
int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 41b3dfe..82bb029 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -568,7 +568,8 @@
*
* Sets the given PCM operators to the pcm instance.
*/
-void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
+void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
+ const struct snd_pcm_ops *ops)
{
struct snd_pcm_str *stream = &pcm->streams[direction];
struct snd_pcm_substream *substream;
