ALSA: core: Treat snd_device_ops as const

This is a preliminary patch to allow const for snd_device_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/20200103081714.9560-4-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/include/sound/core.h b/include/sound/core.h
index af3dce9..0e14b7a 100644 (file)
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -69,7 +69,7 @@ struct snd_device {
        enum snd_device_state state;    /* state of the device */
        enum snd_device_type type;      /* device type */
        void *device_data;              /* device structure */
-       struct snd_device_ops *ops;     /* operations */
+       const struct snd_device_ops *ops;       /* operations */
 };
 
 #define snd_device(n) list_entry(n, struct snd_device, list)
@@ -256,7 +256,7 @@ static inline void snd_card_unref(struct snd_card *card)
 /* device.c */
 
 int snd_device_new(struct snd_card *card, enum snd_device_type type,
-                  void *device_data, struct snd_device_ops *ops);
+                  void *device_data, const struct snd_device_ops *ops);
 int snd_device_register(struct snd_card *card, void *device_data);
 int snd_device_register_all(struct snd_card *card);
 void snd_device_disconnect(struct snd_card *card, void *device_data);

diff --git a/sound/core/device.c b/sound/core/device.c
index 708b919..cdc5af5 100644 (file)
--- a/sound/core/device.c
+++ b/sound/core/device.c
@@ -27,7 +27,7 @@
  * Return: Zero if successful, or a negative error code on failure.
  */
 int snd_device_new(struct snd_card *card, enum snd_device_type type,
-                  void *device_data, struct snd_device_ops *ops)
+                  void *device_data, const struct snd_device_ops *ops)
 {
        struct snd_device *dev;
        struct list_head *p;