We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.
A couple of functions that use snd_card_ref() and *_unref() are also
cleaned up with a defined class, too.
Only the code refactoring, and no functional changes.
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
sound/core/control_led.c | 150 +++++++++++++++++----------------------
1 file changed, 65 insertions(+), 85 deletions(-)
diff --git a/sound/core/control_led.c b/sound/core/control_led.c
index a78eb48927c7..3d37e9fa7b9c 100644
--- a/sound/core/control_led.c
+++ b/sound/core/control_led.c
@@ -147,29 +147,27 @@ static void snd_ctl_led_set_state(struct snd_card *card, unsigned int access,
return;
route = -1;
found = false;
- mutex_lock(&snd_ctl_led_mutex);
- /* the card may not be registered (active) at this point */
- if (card && !snd_ctl_led_card_valid[card->number]) {
- mutex_unlock(&snd_ctl_led_mutex);
- return;
- }
- list_for_each_entry(lctl, &led->controls, list) {
- if (lctl->kctl == kctl && lctl->index_offset == ioff)
- found = true;
- UPDATE_ROUTE(route, snd_ctl_led_get(lctl));
- }
- if (!found && kctl && card) {
- lctl = kzalloc(sizeof(*lctl), GFP_KERNEL);
- if (lctl) {
- lctl->card = card;
- lctl->access = access;
- lctl->kctl = kctl;
- lctl->index_offset = ioff;
- list_add(&lctl->list, &led->controls);
+ scoped_guard(mutex, &snd_ctl_led_mutex) {
+ /* the card may not be registered (active) at this point */
+ if (card && !snd_ctl_led_card_valid[card->number])
+ return;
+ list_for_each_entry(lctl, &led->controls, list) {
+ if (lctl->kctl == kctl && lctl->index_offset == ioff)
+ found = true;
UPDATE_ROUTE(route, snd_ctl_led_get(lctl));
}
+ if (!found && kctl && card) {
+ lctl = kzalloc(sizeof(*lctl), GFP_KERNEL);
+ if (lctl) {
+ lctl->card = card;
+ lctl->access = access;
+ lctl->kctl = kctl;
+ lctl->index_offset = ioff;
+ list_add(&lctl->list, &led->controls);
+ UPDATE_ROUTE(route, snd_ctl_led_get(lctl));
+ }
+ }
}
- mutex_unlock(&snd_ctl_led_mutex);
switch (led->mode) {
case MODE_OFF: route = 1; break;
case MODE_ON: route = 0; break;
@@ -201,14 +199,13 @@ static unsigned int snd_ctl_led_remove(struct snd_kcontrol *kctl, unsigned int i
struct snd_ctl_led_ctl *lctl;
unsigned int ret = 0;
- mutex_lock(&snd_ctl_led_mutex);
+ guard(mutex)(&snd_ctl_led_mutex);
lctl = snd_ctl_led_find(kctl, ioff);
if (lctl && (access == 0 || access != lctl->access)) {
ret = lctl->access;
list_del(&lctl->list);
kfree(lctl);
}
- mutex_unlock(&snd_ctl_led_mutex);
return ret;
}
@@ -239,44 +236,36 @@ static void snd_ctl_led_notify(struct snd_card *card, unsigned int mask,
}
}
+DEFINE_FREE(snd_card_unref, struct snd_card *, if (_T) snd_card_unref(_T))
+
static int snd_ctl_led_set_id(int card_number, struct snd_ctl_elem_id *id,
unsigned int group, bool set)
{
- struct snd_card *card;
+ struct snd_card *card __free(snd_card_unref) = NULL;
struct snd_kcontrol *kctl;
struct snd_kcontrol_volatile *vd;
unsigned int ioff, access, new_access;
- int err = 0;
card = snd_card_ref(card_number);
- if (card) {
- down_write(&card->controls_rwsem);
- kctl = snd_ctl_find_id_locked(card, id);
- if (kctl) {
- ioff = snd_ctl_get_ioff(kctl, id);
- vd = &kctl->vd[ioff];
- access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;
- if (access != 0 && access != group_to_access(group)) {
- err = -EXDEV;
- goto unlock;
- }
- new_access = vd->access & ~SNDRV_CTL_ELEM_ACCESS_LED_MASK;
- if (set)
- new_access |= group_to_access(group);
- if (new_access != vd->access) {
- vd->access = new_access;
- snd_ctl_led_notify(card, SNDRV_CTL_EVENT_MASK_INFO, kctl, ioff);
- }
- } else {
- err = -ENOENT;
- }
-unlock:
- up_write(&card->controls_rwsem);
- snd_card_unref(card);
- } else {
- err = -ENXIO;
+ if (!card)
+ return -ENXIO;
+ guard(rwsem_write)(&card->controls_rwsem);
+ kctl = snd_ctl_find_id_locked(card, id);
+ if (!kctl)
+ return -ENOENT;
+ ioff = snd_ctl_get_ioff(kctl, id);
+ vd = &kctl->vd[ioff];
+ access = vd->access & SNDRV_CTL_ELEM_ACCESS_LED_MASK;
+ if (access != 0 && access != group_to_access(group))
+ return -EXDEV;
+ new_access = vd->access & ~SNDRV_CTL_ELEM_ACCESS_LED_MASK;
+ if (set)
+ new_access |= group_to_access(group);
+ if (new_access != vd->access) {
+ vd->access = new_access;
+ snd_ctl_led_notify(card, SNDRV_CTL_EVENT_MASK_INFO, kctl, ioff);
}
- return err;
+ return 0;
}
static void snd_ctl_led_refresh(void)
@@ -312,7 +301,7 @@ static void snd_ctl_led_clean(struct snd_card *card)
static int snd_ctl_led_reset(int card_number, unsigned int group)
{
- struct snd_card *card;
+ struct snd_card *card __free(snd_card_unref) = NULL;
struct snd_ctl_led *led;
struct snd_ctl_led_ctl *lctl;
struct snd_kcontrol_volatile *vd;
@@ -322,26 +311,22 @@ static int snd_ctl_led_reset(int card_number, unsigned int group)
if (!card)
return -ENXIO;
- mutex_lock(&snd_ctl_led_mutex);
- if (!snd_ctl_led_card_valid[card_number]) {
- mutex_unlock(&snd_ctl_led_mutex);
- snd_card_unref(card);
- return -ENXIO;
- }
- led = &snd_ctl_leds[group];
+ scoped_guard(mutex, &snd_ctl_led_mutex) {
+ if (!snd_ctl_led_card_valid[card_number])
+ return -ENXIO;
+ led = &snd_ctl_leds[group];
repeat:
- list_for_each_entry(lctl, &led->controls, list)
- if (lctl->card == card) {
- vd = &lctl->kctl->vd[lctl->index_offset];
- vd->access &= ~group_to_access(group);
- snd_ctl_led_ctl_destroy(lctl);
- change = true;
- goto repeat;
- }
- mutex_unlock(&snd_ctl_led_mutex);
+ list_for_each_entry(lctl, &led->controls, list)
+ if (lctl->card == card) {
+ vd = &lctl->kctl->vd[lctl->index_offset];
+ vd->access &= ~group_to_access(group);
+ snd_ctl_led_ctl_destroy(lctl);
+ change = true;
+ goto repeat;
+ }
+ }
if (change)
snd_ctl_led_set_state(NULL, group_to_access(group), NULL, 0);
- snd_card_unref(card);
return 0;
}
@@ -353,9 +338,8 @@ static void snd_ctl_led_register(struct snd_card *card)
if (snd_BUG_ON(card->number < 0 ||
card->number >= ARRAY_SIZE(snd_ctl_led_card_valid)))
return;
- mutex_lock(&snd_ctl_led_mutex);
- snd_ctl_led_card_valid[card->number] = true;
- mutex_unlock(&snd_ctl_led_mutex);
+ scoped_guard(mutex, &snd_ctl_led_mutex)
+ snd_ctl_led_card_valid[card->number] = true;
/* the register callback is already called with held card->controls_rwsem */
list_for_each_entry(kctl, &card->controls, list)
for (ioff = 0; ioff < kctl->count; ioff++)
@@ -367,10 +351,10 @@ static void snd_ctl_led_register(struct snd_card *card)
static void snd_ctl_led_disconnect(struct snd_card *card)
{
snd_ctl_led_sysfs_remove(card);
- mutex_lock(&snd_ctl_led_mutex);
- snd_ctl_led_card_valid[card->number] = false;
- snd_ctl_led_clean(card);
- mutex_unlock(&snd_ctl_led_mutex);
+ scoped_guard(mutex, &snd_ctl_led_mutex) {
+ snd_ctl_led_card_valid[card->number] = false;
+ snd_ctl_led_clean(card);
+ }
snd_ctl_led_refresh();
}
@@ -430,9 +414,8 @@ static ssize_t mode_store(struct device *dev,
else
return count;
- mutex_lock(&snd_ctl_led_mutex);
- led->mode = mode;
- mutex_unlock(&snd_ctl_led_mutex);
+ scoped_guard(mutex, &snd_ctl_led_mutex)
+ led->mode = mode;
snd_ctl_led_set_state(NULL, group_to_access(led->group), NULL, 0);
return count;
@@ -615,15 +598,15 @@ static ssize_t list_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct snd_ctl_led_card *led_card = container_of(dev, struct snd_ctl_led_card, dev);
- struct snd_card *card;
+ struct snd_card *card __free(snd_card_unref) = NULL;
struct snd_ctl_led_ctl *lctl;
size_t l = 0;
card = snd_card_ref(led_card->number);
if (!card)
return -ENXIO;
- down_read(&card->controls_rwsem);
- mutex_lock(&snd_ctl_led_mutex);
+ guard(rwsem_read)(&card->controls_rwsem);
+ guard(mutex)(&snd_ctl_led_mutex);
if (snd_ctl_led_card_valid[led_card->number]) {
list_for_each_entry(lctl, &led_card->led->controls, list) {
if (lctl->card != card)
@@ -634,9 +617,6 @@ static ssize_t list_show(struct device *dev,
lctl->kctl->id.numid + lctl->index_offset);
}
}
- mutex_unlock(&snd_ctl_led_mutex);
- up_read(&card->controls_rwsem);
- snd_card_unref(card);
return l;
}
--
2.35.3
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