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sound: make all 'class' structures const

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Now that the driver core allows for struct class to be in read-only
memory, making all 'class' structures to be declared at build time
placing them into read-only memory, instead of having to be dynamically
allocated at load time.

Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Ivan Orlov <ivan.orlov0322@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Thierry Reding <treding@nvidia.com>
Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: alsa-devel@alsa-project.org
Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20230620175633.641141-2-gregkh@linuxfoundation.org
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Ivan Orlov 2023-06-20 19:56:34 +02:00 committed by Takashi Iwai
parent 7ea9ee0064
commit 8d0cf150d2
4 changed files with 16 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/sound/core.h
View File

@ -232,7 +232,7 @@ static inline struct device *snd_card_get_device_link(struct snd_card *card)
extern int snd_major;
extern int snd_ecards_limit;
extern struct class *sound_class;
extern const struct class sound_class;
#ifdef CONFIG_SND_DEBUG
extern struct dentry *sound_debugfs_root;
#endif

2
sound/core/control_led.c
View File

@ -737,7 +737,7 @@ static int __init snd_ctl_led_init(void)
unsigned int group;
device_initialize(&snd_ctl_led_dev);
snd_ctl_led_dev.class = sound_class;
snd_ctl_led_dev.class = &sound_class;
snd_ctl_led_dev.release = snd_ctl_led_dev_release;
dev_set_name(&snd_ctl_led_dev, "ctl-led");
if (device_add(&snd_ctl_led_dev)) {

4
sound/core/init.c
View File

@ -129,7 +129,7 @@ void snd_device_initialize(struct device *dev, struct snd_card *card)
device_initialize(dev);
if (card)
dev->parent = &card->card_dev;
dev->class = sound_class;
dev->class = &sound_class;
dev->release = default_release;
}
EXPORT_SYMBOL_GPL(snd_device_initialize);
@ -331,7 +331,7 @@ static int snd_card_init(struct snd_card *card, struct device *parent,
device_initialize(&card->card_dev);
card->card_dev.parent = parent;
card->card_dev.class = sound_class;
card->card_dev.class = &sound_class;
card->card_dev.release = release_card_device;
card->card_dev.groups = card->dev_groups;
card->dev_groups[0] = &card_dev_attr_group;

23
sound/sound_core.c
View File

@ -23,9 +23,6 @@ static inline int init_oss_soundcore(void) { return 0; }
static inline void cleanup_oss_soundcore(void) { }
#endif
struct class *sound_class;
EXPORT_SYMBOL(sound_class);
MODULE_DESCRIPTION("Core sound module");
MODULE_AUTHOR("Alan Cox");
MODULE_LICENSE("GPL");
@ -37,6 +34,12 @@ static char *sound_devnode(const struct device *dev, umode_t *mode)
return kasprintf(GFP_KERNEL, "snd/%s", dev_name(dev));
}
const struct class sound_class = {
.name = "sound",
.devnode = sound_devnode,
};
EXPORT_SYMBOL(sound_class);
static int __init init_soundcore(void)
{
int rc;
@ -45,21 +48,19 @@ static int __init init_soundcore(void)
if (rc)
return rc;
sound_class = class_create("sound");
if (IS_ERR(sound_class)) {
rc = class_register(&sound_class);
if (rc) {
cleanup_oss_soundcore();
return PTR_ERR(sound_class);
return rc;
}
sound_class->devnode = sound_devnode;
return 0;
}
static void __exit cleanup_soundcore(void)
{
cleanup_oss_soundcore();
class_destroy(sound_class);
class_unregister(&sound_class);
}
subsys_initcall(init_soundcore);
@ -276,7 +277,7 @@ static int sound_insert_unit(struct sound_unit **list, const struct file_operati
}
}
device_create(sound_class, dev, MKDEV(SOUND_MAJOR, s->unit_minor),
device_create(&sound_class, dev, MKDEV(SOUND_MAJOR, s->unit_minor),
NULL, "%s", s->name+6);
return s->unit_minor;
@ -302,7 +303,7 @@ static void sound_remove_unit(struct sound_unit **list, int unit)
if (!preclaim_oss)
__unregister_chrdev(SOUND_MAJOR, p->unit_minor, 1,
p->name);
device_destroy(sound_class, MKDEV(SOUND_MAJOR, p->unit_minor));
device_destroy(&sound_class, MKDEV(SOUND_MAJOR, p->unit_minor));
kfree(p);
}
}