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ALSA: ac97: Treat snd_ac97_bus_ops as const

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This is a preliminary patch to allow const for snd_ac97_bus_ops
definitions in each driver's code.  The ops reference is read-only,
hence it can be declared as const for further optimization.

There should be no functional changes by this patch.

Link: https://lore.kernel.org/r/20200103081714.9560-23-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2020-01-03 09:16:38 +01:00
parent 5ff16a3d48
commit 19260818a9
3 changed files with 6 additions and 4 deletions
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5
include/sound/ac97_codec.h
View File

@ -197,7 +197,7 @@ struct snd_ac97_bus_ops {
struct snd_ac97_bus {
/* -- lowlevel (hardware) driver specific -- */
struct snd_ac97_bus_ops *ops;
const struct snd_ac97_bus_ops *ops;
void *private_data;
void (*private_free) (struct snd_ac97_bus *bus);
/* --- */
@ -310,7 +310,8 @@ static inline int ac97_can_spdif(struct snd_ac97 * ac97)
/* functions */
/* create new AC97 bus */
int snd_ac97_bus(struct snd_card *card, int num, struct snd_ac97_bus_ops *ops,
int snd_ac97_bus(struct snd_card *card, int num,
const struct snd_ac97_bus_ops *ops,
void *private_data, struct snd_ac97_bus **rbus);
/* create mixer controls */
int snd_ac97_mixer(struct snd_ac97_bus *bus, struct snd_ac97_template *template,

2
sound/ac97_bus.c
View File

@ -55,7 +55,7 @@ static bool snd_ac97_check_id(struct snd_ac97 *ac97, unsigned int id,
int snd_ac97_reset(struct snd_ac97 *ac97, bool try_warm, unsigned int id,
unsigned int id_mask)
{
struct snd_ac97_bus_ops *ops = ac97->bus->ops;
const struct snd_ac97_bus_ops *ops = ac97->bus->ops;
if (try_warm && ops->warm_reset) {
ops->warm_reset(ac97);

3
sound/pci/ac97/ac97_codec.c
View File

@ -1894,7 +1894,8 @@ static int ac97_reset_wait(struct snd_ac97 *ac97, int timeout, int with_modem)
*
* Return: Zero if successful, or a negative error code on failure.
*/
int snd_ac97_bus(struct snd_card *card, int num, struct snd_ac97_bus_ops *ops,
int snd_ac97_bus(struct snd_card *card, int num,
const struct snd_ac97_bus_ops *ops,
void *private_data, struct snd_ac97_bus **rbus)
{
int err;