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ALSA: timer: Use guard() for locking

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We can simplify the code gracefully with new guard() macro and co for
automatic cleanup of locks.

For making changes easier, some functions widen the application of
register_mutex, but those shouldn't influence on any actual
performance.

Also, one code block was factored out as a function so that guard()
can be applied cleanly without much indentation.

There are still a few remaining explicit spin_lock/unlock calls, and
those are for the places where we do temporary unlock/relock, which
doesn't fit well with the guard(), so far.

Only the code refactoring, and no functional changes.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20240227085306.9764-4-tiwai@suse.de
This commit is contained in:
Takashi Iwai 2024-02-27 09:52:45 +01:00
parent d648843aa4
commit beb45974dd
2 changed files with 177 additions and 259 deletions
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429
sound/core/timer.c
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@ -224,14 +224,12 @@ static int check_matching_master_slave(struct snd_timer_instance *master,
return -EBUSY;
list_move_tail(&slave->open_list, &master->slave_list_head);
master->timer->num_instances++;
spin_lock_irq(&slave_active_lock);
spin_lock(&master->timer->lock);
guard(spinlock_irq)(&slave_active_lock);
guard(spinlock)(&master->timer->lock);
slave->master = master;
slave->timer = master->timer;
if (slave->flags & SNDRV_TIMER_IFLG_RUNNING)
list_add_tail(&slave->active_list, &master->slave_active_head);
spin_unlock(&master->timer->lock);
spin_unlock_irq(&slave_active_lock);
return 1;
}
@ -382,6 +380,25 @@ list_added:
}
EXPORT_SYMBOL(snd_timer_open);
/* remove slave links, called from snd_timer_close_locked() below */
static void remove_slave_links(struct snd_timer_instance *timeri,
struct snd_timer *timer)
{
struct snd_timer_instance *slave, *tmp;
guard(spinlock_irq)(&slave_active_lock);
guard(spinlock)(&timer->lock);
timeri->timer = NULL;
list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head, open_list) {
list_move_tail(&slave->open_list, &snd_timer_slave_list);
timer->num_instances--;
slave->master = NULL;
slave->timer = NULL;
list_del_init(&slave->ack_list);
list_del_init(&slave->active_list);
}
}
/*
* close a timer instance
* call this with register_mutex down.
@ -390,12 +407,10 @@ static void snd_timer_close_locked(struct snd_timer_instance *timeri,
struct device **card_devp_to_put)
{
struct snd_timer *timer = timeri->timer;
struct snd_timer_instance *slave, *tmp;
if (timer) {
spin_lock_irq(&timer->lock);
guard(spinlock)(&timer->lock);
timeri->flags |= SNDRV_TIMER_IFLG_DEAD;
spin_unlock_irq(&timer->lock);
}
if (!list_empty(&timeri->open_list)) {
@ -418,21 +433,7 @@ static void snd_timer_close_locked(struct snd_timer_instance *timeri,
}
spin_unlock_irq(&timer->lock);
/* remove slave links */
spin_lock_irq(&slave_active_lock);
spin_lock(&timer->lock);
timeri->timer = NULL;
list_for_each_entry_safe(slave, tmp, &timeri->slave_list_head,
open_list) {
list_move_tail(&slave->open_list, &snd_timer_slave_list);
timer->num_instances--;
slave->master = NULL;
slave->timer = NULL;
list_del_init(&slave->ack_list);
list_del_init(&slave->active_list);
}
spin_unlock(&timer->lock);
spin_unlock_irq(&slave_active_lock);
remove_slave_links(timeri, timer);
/* slave doesn't need to release timer resources below */
if (timeri->flags & SNDRV_TIMER_IFLG_SLAVE)
@ -459,9 +460,8 @@ void snd_timer_close(struct snd_timer_instance *timeri)
if (snd_BUG_ON(!timeri))
return;
mutex_lock(&register_mutex);
snd_timer_close_locked(timeri, &card_dev_to_put);
mutex_unlock(&register_mutex);
scoped_guard(mutex, &register_mutex)
snd_timer_close_locked(timeri, &card_dev_to_put);
/* put_device() is called after unlock for avoiding deadlock */
if (card_dev_to_put)
put_device(card_dev_to_put);
@ -480,15 +480,13 @@ unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
{
struct snd_timer * timer;
unsigned long ret = 0;
unsigned long flags;
if (timeri == NULL)
return 0;
timer = timeri->timer;
if (timer) {
spin_lock_irqsave(&timer->lock, flags);
guard(spinlock_irqsave)(&timer->lock);
ret = snd_timer_hw_resolution(timer);
spin_unlock_irqrestore(&timer->lock, flags);
}
return ret;
}
@ -532,26 +530,19 @@ static int snd_timer_start1(struct snd_timer_instance *timeri,
{
struct snd_timer *timer;
int result;
unsigned long flags;
timer = timeri->timer;
if (!timer)
return -EINVAL;
spin_lock_irqsave(&timer->lock, flags);
if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
result = -EINVAL;
goto unlock;
}
if (timer->card && timer->card->shutdown) {
result = -ENODEV;
goto unlock;
}
guard(spinlock_irqsave)(&timer->lock);
if (timeri->flags & SNDRV_TIMER_IFLG_DEAD)
return -EINVAL;
if (timer->card && timer->card->shutdown)
return -ENODEV;
if (timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
SNDRV_TIMER_IFLG_START)) {
result = -EBUSY;
goto unlock;
}
SNDRV_TIMER_IFLG_START))
return -EBUSY;
if (start)
timeri->ticks = timeri->cticks = ticks;
@ -577,8 +568,6 @@ static int snd_timer_start1(struct snd_timer_instance *timeri,
}
snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
SNDRV_TIMER_EVENT_CONTINUE);
unlock:
spin_unlock_irqrestore(&timer->lock, flags);
return result;
}
@ -586,53 +575,38 @@ static int snd_timer_start1(struct snd_timer_instance *timeri,
static int snd_timer_start_slave(struct snd_timer_instance *timeri,
bool start)
{
unsigned long flags;
int err;
spin_lock_irqsave(&slave_active_lock, flags);
if (timeri->flags & SNDRV_TIMER_IFLG_DEAD) {
err = -EINVAL;
goto unlock;
}
if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING) {
err = -EBUSY;
goto unlock;
}
guard(spinlock_irqsave)(&slave_active_lock);
if (timeri->flags & SNDRV_TIMER_IFLG_DEAD)
return -EINVAL;
if (timeri->flags & SNDRV_TIMER_IFLG_RUNNING)
return -EBUSY;
timeri->flags |= SNDRV_TIMER_IFLG_RUNNING;
if (timeri->master && timeri->timer) {
spin_lock(&timeri->timer->lock);
guard(spinlock)(&timeri->timer->lock);
list_add_tail(&timeri->active_list,
&timeri->master->slave_active_head);
snd_timer_notify1(timeri, start ? SNDRV_TIMER_EVENT_START :
SNDRV_TIMER_EVENT_CONTINUE);
spin_unlock(&timeri->timer->lock);
}
err = 1; /* delayed start */
unlock:
spin_unlock_irqrestore(&slave_active_lock, flags);
return err;
return 1; /* delayed start */
}
/* stop/pause a master timer */
static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
{
struct snd_timer *timer;
int result = 0;
unsigned long flags;
timer = timeri->timer;
if (!timer)
return -EINVAL;
spin_lock_irqsave(&timer->lock, flags);
guard(spinlock_irqsave)(&timer->lock);
list_del_init(&timeri->ack_list);
list_del_init(&timeri->active_list);
if (!(timeri->flags & (SNDRV_TIMER_IFLG_RUNNING |
SNDRV_TIMER_IFLG_START))) {
result = -EBUSY;
goto unlock;
}
SNDRV_TIMER_IFLG_START)))
return -EBUSY;
if (timer->card && timer->card->shutdown)
goto unlock;
return 0;
if (stop) {
timeri->cticks = timeri->ticks;
timeri->pticks = 0;
@ -656,30 +630,25 @@ static int snd_timer_stop1(struct snd_timer_instance *timeri, bool stop)
timeri->flags |= SNDRV_TIMER_IFLG_PAUSED;
snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
SNDRV_TIMER_EVENT_PAUSE);
unlock:
spin_unlock_irqrestore(&timer->lock, flags);
return result;
return 0;
}
/* stop/pause a slave timer */
static int snd_timer_stop_slave(struct snd_timer_instance *timeri, bool stop)
{
unsigned long flags;
bool running;
spin_lock_irqsave(&slave_active_lock, flags);
guard(spinlock_irqsave)(&slave_active_lock);
running = timeri->flags & SNDRV_TIMER_IFLG_RUNNING;
timeri->flags &= ~SNDRV_TIMER_IFLG_RUNNING;
if (timeri->timer) {
spin_lock(&timeri->timer->lock);
guard(spinlock)(&timeri->timer->lock);
list_del_init(&timeri->ack_list);
list_del_init(&timeri->active_list);
if (running)
snd_timer_notify1(timeri, stop ? SNDRV_TIMER_EVENT_STOP :
SNDRV_TIMER_EVENT_PAUSE);
spin_unlock(&timeri->timer->lock);
}
spin_unlock_irqrestore(&slave_active_lock, flags);
return running ? 0 : -EBUSY;
}
@ -804,12 +773,9 @@ static void snd_timer_process_callbacks(struct snd_timer *timer,
static void snd_timer_clear_callbacks(struct snd_timer *timer,
struct list_head *head)
{
unsigned long flags;
spin_lock_irqsave(&timer->lock, flags);
guard(spinlock_irqsave)(&timer->lock);
while (!list_empty(head))
list_del_init(head->next);
spin_unlock_irqrestore(&timer->lock, flags);
}
/*
@ -819,16 +785,14 @@ static void snd_timer_clear_callbacks(struct snd_timer *timer,
static void snd_timer_work(struct work_struct *work)
{
struct snd_timer *timer = container_of(work, struct snd_timer, task_work);
unsigned long flags;
if (timer->card && timer->card->shutdown) {
snd_timer_clear_callbacks(timer, &timer->sack_list_head);
return;
}
spin_lock_irqsave(&timer->lock, flags);
guard(spinlock_irqsave)(&timer->lock);
snd_timer_process_callbacks(timer, &timer->sack_list_head);
spin_unlock_irqrestore(&timer->lock, flags);
}
/*
@ -842,8 +806,6 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
struct snd_timer_instance *ti, *ts, *tmp;
unsigned long resolution;
struct list_head *ack_list_head;
unsigned long flags;
bool use_work = false;
if (timer == NULL)
return;
@ -853,7 +815,7 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
return;
}
spin_lock_irqsave(&timer->lock, flags);
guard(spinlock_irqsave)(&timer->lock);
/* remember the current resolution */
resolution = snd_timer_hw_resolution(timer);
@ -919,10 +881,7 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
snd_timer_process_callbacks(timer, &timer->ack_list_head);
/* do we have any slow callbacks? */
use_work = !list_empty(&timer->sack_list_head);
spin_unlock_irqrestore(&timer->lock, flags);
if (use_work)
if (!list_empty(&timer->sack_list_head))
queue_work(system_highpri_wq, &timer->task_work);
}
EXPORT_SYMBOL(snd_timer_interrupt);
@ -988,7 +947,7 @@ static int snd_timer_free(struct snd_timer *timer)
if (!timer)
return 0;
mutex_lock(&register_mutex);
guard(mutex)(&register_mutex);
if (! list_empty(&timer->open_list_head)) {
struct list_head *p, *n;
struct snd_timer_instance *ti;
@ -1000,7 +959,6 @@ static int snd_timer_free(struct snd_timer *timer)
}
}
list_del(&timer->device_list);
mutex_unlock(&register_mutex);
if (timer->private_free)
timer->private_free(timer);
@ -1025,7 +983,7 @@ static int snd_timer_dev_register(struct snd_device *dev)
!timer->hw.resolution && timer->hw.c_resolution == NULL)
return -EINVAL;
mutex_lock(&register_mutex);
guard(mutex)(&register_mutex);
list_for_each_entry(timer1, &snd_timer_list, device_list) {
if (timer1->tmr_class > timer->tmr_class)
break;
@ -1046,11 +1004,9 @@ static int snd_timer_dev_register(struct snd_device *dev)
if (timer1->tmr_subdevice < timer->tmr_subdevice)
continue;
/* conflicts.. */
mutex_unlock(&register_mutex);
return -EBUSY;
}
list_add_tail(&timer->device_list, &timer1->device_list);
mutex_unlock(&register_mutex);
return 0;
}
@ -1059,20 +1015,18 @@ static int snd_timer_dev_disconnect(struct snd_device *device)
struct snd_timer *timer = device->device_data;
struct snd_timer_instance *ti;
mutex_lock(&register_mutex);
guard(mutex)(&register_mutex);
list_del_init(&timer->device_list);
/* wake up pending sleepers */
list_for_each_entry(ti, &timer->open_list_head, open_list) {
if (ti->disconnect)
ti->disconnect(ti);
}
mutex_unlock(&register_mutex);
return 0;
}
void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tstamp)
{
unsigned long flags;
unsigned long resolution = 0;
struct snd_timer_instance *ti, *ts;
@ -1083,7 +1037,7 @@ void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tst
if (snd_BUG_ON(event < SNDRV_TIMER_EVENT_MSTART ||
event > SNDRV_TIMER_EVENT_MRESUME))
return;
spin_lock_irqsave(&timer->lock, flags);
guard(spinlock_irqsave)(&timer->lock);
if (event == SNDRV_TIMER_EVENT_MSTART ||
event == SNDRV_TIMER_EVENT_MCONTINUE ||
event == SNDRV_TIMER_EVENT_MRESUME)
@ -1095,7 +1049,6 @@ void snd_timer_notify(struct snd_timer *timer, int event, struct timespec64 *tst
if (ts->ccallback)
ts->ccallback(ts, event, tstamp, resolution);
}
spin_unlock_irqrestore(&timer->lock, flags);
}
EXPORT_SYMBOL(snd_timer_notify);
@ -1248,7 +1201,7 @@ static void snd_timer_proc_read(struct snd_info_entry *entry,
struct snd_timer_instance *ti;
unsigned long resolution;
mutex_lock(&register_mutex);
guard(mutex)(&register_mutex);
list_for_each_entry(timer, &snd_timer_list, device_list) {
if (timer->card && timer->card->shutdown)
continue;
@ -1270,9 +1223,8 @@ static void snd_timer_proc_read(struct snd_info_entry *entry,
timer->tmr_device, timer->tmr_subdevice);
}
snd_iprintf(buffer, "%s :", timer->name);
spin_lock_irq(&timer->lock);
resolution = snd_timer_hw_resolution(timer);
spin_unlock_irq(&timer->lock);
scoped_guard(spinlock_irq, &timer->lock)
resolution = snd_timer_hw_resolution(timer);
if (resolution)
snd_iprintf(buffer, " %lu.%03luus (%lu ticks)",
resolution / 1000,
@ -1288,7 +1240,6 @@ static void snd_timer_proc_read(struct snd_info_entry *entry,
SNDRV_TIMER_IFLG_RUNNING))
? "running" : "stopped");
}
mutex_unlock(&register_mutex);
}
static struct snd_info_entry *snd_timer_proc_entry;
@ -1329,7 +1280,7 @@ static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
struct snd_timer_read *r;
int prev;
spin_lock(&tu->qlock);
guard(spinlock)(&tu->qlock);
if (tu->qused > 0) {
prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
r = &tu->queue[prev];
@ -1348,7 +1299,6 @@ static void snd_timer_user_interrupt(struct snd_timer_instance *timeri,
tu->qused++;
}
__wake:
spin_unlock(&tu->qlock);
snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
wake_up(&tu->qchange_sleep);
}
@ -1372,7 +1322,6 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
{
struct snd_timer_user *tu = timeri->callback_data;
struct snd_timer_tread64 r1;
unsigned long flags;
if (event >= SNDRV_TIMER_EVENT_START &&
event <= SNDRV_TIMER_EVENT_PAUSE)
@ -1384,9 +1333,8 @@ static void snd_timer_user_ccallback(struct snd_timer_instance *timeri,
r1.tstamp_sec = tstamp->tv_sec;
r1.tstamp_nsec = tstamp->tv_nsec;
r1.val = resolution;
spin_lock_irqsave(&tu->qlock, flags);
snd_timer_user_append_to_tqueue(tu, &r1);
spin_unlock_irqrestore(&tu->qlock, flags);
scoped_guard(spinlock_irqsave, &tu->qlock)
snd_timer_user_append_to_tqueue(tu, &r1);
snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
wake_up(&tu->qchange_sleep);
}
@ -1410,51 +1358,48 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
memset(&r1, 0, sizeof(r1));
memset(&tstamp, 0, sizeof(tstamp));
spin_lock(&tu->qlock);
if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
(1 << SNDRV_TIMER_EVENT_TICK))) == 0) {
spin_unlock(&tu->qlock);
return;
}
if (tu->last_resolution != resolution || ticks > 0) {
if (timer_tstamp_monotonic)
ktime_get_ts64(&tstamp);
else
ktime_get_real_ts64(&tstamp);
}
if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
tu->last_resolution != resolution) {
r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
scoped_guard(spinlock, &tu->qlock) {
if ((tu->filter & ((1 << SNDRV_TIMER_EVENT_RESOLUTION) |
(1 << SNDRV_TIMER_EVENT_TICK))) == 0)
return;
if (tu->last_resolution != resolution || ticks > 0) {
if (timer_tstamp_monotonic)
ktime_get_ts64(&tstamp);
else
ktime_get_real_ts64(&tstamp);
}
if ((tu->filter & (1 << SNDRV_TIMER_EVENT_RESOLUTION)) &&
tu->last_resolution != resolution) {
r1.event = SNDRV_TIMER_EVENT_RESOLUTION;
r1.tstamp_sec = tstamp.tv_sec;
r1.tstamp_nsec = tstamp.tv_nsec;
r1.val = resolution;
snd_timer_user_append_to_tqueue(tu, &r1);
tu->last_resolution = resolution;
append++;
}
if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
break;
if (ticks == 0)
break;
if (tu->qused > 0) {
prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
r = &tu->tqueue[prev];
if (r->event == SNDRV_TIMER_EVENT_TICK) {
r->tstamp_sec = tstamp.tv_sec;
r->tstamp_nsec = tstamp.tv_nsec;
r->val += ticks;
append++;
break;
}
}
r1.event = SNDRV_TIMER_EVENT_TICK;
r1.tstamp_sec = tstamp.tv_sec;
r1.tstamp_nsec = tstamp.tv_nsec;
r1.val = resolution;
r1.val = ticks;
snd_timer_user_append_to_tqueue(tu, &r1);
tu->last_resolution = resolution;
append++;
}
if ((tu->filter & (1 << SNDRV_TIMER_EVENT_TICK)) == 0)
goto __wake;
if (ticks == 0)
goto __wake;
if (tu->qused > 0) {
prev = tu->qtail == 0 ? tu->queue_size - 1 : tu->qtail - 1;
r = &tu->tqueue[prev];
if (r->event == SNDRV_TIMER_EVENT_TICK) {
r->tstamp_sec = tstamp.tv_sec;
r->tstamp_nsec = tstamp.tv_nsec;
r->val += ticks;
append++;
goto __wake;
}
}
r1.event = SNDRV_TIMER_EVENT_TICK;
r1.tstamp_sec = tstamp.tv_sec;
r1.tstamp_nsec = tstamp.tv_nsec;
r1.val = ticks;
snd_timer_user_append_to_tqueue(tu, &r1);
append++;
__wake:
spin_unlock(&tu->qlock);
if (append == 0)
return;
snd_kill_fasync(tu->fasync, SIGIO, POLL_IN);
@ -1476,14 +1421,13 @@ static int realloc_user_queue(struct snd_timer_user *tu, int size)
return -ENOMEM;
}
spin_lock_irq(&tu->qlock);
guard(spinlock_irq)(&tu->qlock);
kfree(tu->queue);
kfree(tu->tqueue);
tu->queue_size = size;
tu->queue = queue;
tu->tqueue = tqueue;
tu->qhead = tu->qtail = tu->qused = 0;
spin_unlock_irq(&tu->qlock);
return 0;
}
@ -1519,12 +1463,12 @@ static int snd_timer_user_release(struct inode *inode, struct file *file)
if (file->private_data) {
tu = file->private_data;
file->private_data = NULL;
mutex_lock(&tu->ioctl_lock);
if (tu->timeri) {
snd_timer_close(tu->timeri);
snd_timer_instance_free(tu->timeri);
scoped_guard(mutex, &tu->ioctl_lock) {
if (tu->timeri) {
snd_timer_close(tu->timeri);
snd_timer_instance_free(tu->timeri);
}
}
mutex_unlock(&tu->ioctl_lock);
snd_fasync_free(tu->fasync);
kfree(tu->queue);
kfree(tu->tqueue);
@ -1559,7 +1503,7 @@ static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
if (copy_from_user(&id, _tid, sizeof(id)))
return -EFAULT;
mutex_lock(&register_mutex);
guard(mutex)(&register_mutex);
if (id.dev_class < 0) { /* first item */
if (list_empty(&snd_timer_list))
snd_timer_user_zero_id(&id);
@ -1636,7 +1580,6 @@ static int snd_timer_user_next_device(struct snd_timer_id __user *_tid)
snd_timer_user_zero_id(&id);
}
}
mutex_unlock(&register_mutex);
if (copy_to_user(_tid, &id, sizeof(*_tid)))
return -EFAULT;
return 0;
@ -1649,7 +1592,6 @@ static int snd_timer_user_ginfo(struct file *file,
struct snd_timer_id tid;
struct snd_timer *t;
struct list_head *p;
int err = 0;
ginfo = memdup_user(_ginfo, sizeof(*ginfo));
if (IS_ERR(ginfo))
@ -1658,56 +1600,42 @@ static int snd_timer_user_ginfo(struct file *file,
tid = ginfo->tid;
memset(ginfo, 0, sizeof(*ginfo));
ginfo->tid = tid;
mutex_lock(&register_mutex);
guard(mutex)(&register_mutex);
t = snd_timer_find(&tid);
if (t != NULL) {
ginfo->card = t->card ? t->card->number : -1;
if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
strscpy(ginfo->id, t->id, sizeof(ginfo->id));
strscpy(ginfo->name, t->name, sizeof(ginfo->name));
spin_lock_irq(&t->lock);
if (!t)
return -ENODEV;
ginfo->card = t->card ? t->card->number : -1;
if (t->hw.flags & SNDRV_TIMER_HW_SLAVE)
ginfo->flags |= SNDRV_TIMER_FLG_SLAVE;
strscpy(ginfo->id, t->id, sizeof(ginfo->id));
strscpy(ginfo->name, t->name, sizeof(ginfo->name));
scoped_guard(spinlock_irq, &t->lock)
ginfo->resolution = snd_timer_hw_resolution(t);
spin_unlock_irq(&t->lock);
if (t->hw.resolution_min > 0) {
ginfo->resolution_min = t->hw.resolution_min;
ginfo->resolution_max = t->hw.resolution_max;
}
list_for_each(p, &t->open_list_head) {
ginfo->clients++;
}
} else {
err = -ENODEV;
if (t->hw.resolution_min > 0) {
ginfo->resolution_min = t->hw.resolution_min;
ginfo->resolution_max = t->hw.resolution_max;
}
mutex_unlock(&register_mutex);
if (err >= 0 && copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
err = -EFAULT;
return err;
list_for_each(p, &t->open_list_head) {
ginfo->clients++;
}
if (copy_to_user(_ginfo, ginfo, sizeof(*ginfo)))
return -EFAULT;
return 0;
}
static int timer_set_gparams(struct snd_timer_gparams *gparams)
{
struct snd_timer *t;
int err;
mutex_lock(&register_mutex);
guard(mutex)(&register_mutex);
t = snd_timer_find(&gparams->tid);
if (!t) {
err = -ENODEV;
goto _error;
}
if (!list_empty(&t->open_list_head)) {
err = -EBUSY;
goto _error;
}
if (!t->hw.set_period) {
err = -ENOSYS;
goto _error;
}
err = t->hw.set_period(t, gparams->period_num, gparams->period_den);
_error:
mutex_unlock(&register_mutex);
return err;
if (!t)
return -ENODEV;
if (!list_empty(&t->open_list_head))
return -EBUSY;
if (!t->hw.set_period)
return -ENOSYS;
return t->hw.set_period(t, gparams->period_num, gparams->period_den);
}
static int snd_timer_user_gparams(struct file *file,
@ -1733,10 +1661,10 @@ static int snd_timer_user_gstatus(struct file *file,
tid = gstatus.tid;
memset(&gstatus, 0, sizeof(gstatus));
gstatus.tid = tid;
mutex_lock(&register_mutex);
guard(mutex)(&register_mutex);
t = snd_timer_find(&tid);
if (t != NULL) {
spin_lock_irq(&t->lock);
guard(spinlock_irq)(&t->lock);
gstatus.resolution = snd_timer_hw_resolution(t);
if (t->hw.precise_resolution) {
t->hw.precise_resolution(t, &gstatus.resolution_num,
@ -1745,11 +1673,9 @@ static int snd_timer_user_gstatus(struct file *file,
gstatus.resolution_num = gstatus.resolution;
gstatus.resolution_den = 1000000000uL;
}
spin_unlock_irq(&t->lock);
} else {
err = -ENODEV;
}
mutex_unlock(&register_mutex);
if (err >= 0 && copy_to_user(_gstatus, &gstatus, sizeof(gstatus)))
err = -EFAULT;
return err;
@ -1821,9 +1747,8 @@ static int snd_timer_user_info(struct file *file,
info->flags |= SNDRV_TIMER_FLG_SLAVE;
strscpy(info->id, t->id, sizeof(info->id));
strscpy(info->name, t->name, sizeof(info->name));
spin_lock_irq(&t->lock);
info->resolution = snd_timer_hw_resolution(t);
spin_unlock_irq(&t->lock);
scoped_guard(spinlock_irq, &t->lock)
info->resolution = snd_timer_hw_resolution(t);
if (copy_to_user(_info, info, sizeof(*_info)))
return -EFAULT;
return 0;
@ -1884,45 +1809,47 @@ static int snd_timer_user_params(struct file *file,
goto _end;
}
snd_timer_stop(tu->timeri);
spin_lock_irq(&t->lock);
tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
SNDRV_TIMER_IFLG_EXCLUSIVE|
SNDRV_TIMER_IFLG_EARLY_EVENT);
if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
spin_unlock_irq(&t->lock);
scoped_guard(spinlock_irq, &t->lock) {
tu->timeri->flags &= ~(SNDRV_TIMER_IFLG_AUTO|
SNDRV_TIMER_IFLG_EXCLUSIVE|
SNDRV_TIMER_IFLG_EARLY_EVENT);
if (params.flags & SNDRV_TIMER_PSFLG_AUTO)
tu->timeri->flags |= SNDRV_TIMER_IFLG_AUTO;
if (params.flags & SNDRV_TIMER_PSFLG_EXCLUSIVE)
tu->timeri->flags |= SNDRV_TIMER_IFLG_EXCLUSIVE;
if (params.flags & SNDRV_TIMER_PSFLG_EARLY_EVENT)
tu->timeri->flags |= SNDRV_TIMER_IFLG_EARLY_EVENT;
}
if (params.queue_size > 0 &&
(unsigned int)tu->queue_size != params.queue_size) {
err = realloc_user_queue(tu, params.queue_size);
if (err < 0)
goto _end;
}
spin_lock_irq(&tu->qlock);
tu->qhead = tu->qtail = tu->qused = 0;
if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
if (tu->tread) {
struct snd_timer_tread64 tread;
memset(&tread, 0, sizeof(tread));
tread.event = SNDRV_TIMER_EVENT_EARLY;
tread.tstamp_sec = 0;
tread.tstamp_nsec = 0;
tread.val = 0;
snd_timer_user_append_to_tqueue(tu, &tread);
} else {
struct snd_timer_read *r = &tu->queue[0];
r->resolution = 0;
r->ticks = 0;
tu->qused++;
tu->qtail++;
scoped_guard(spinlock_irq, &tu->qlock) {
tu->qhead = tu->qtail = tu->qused = 0;
if (tu->timeri->flags & SNDRV_TIMER_IFLG_EARLY_EVENT) {
if (tu->tread) {
struct snd_timer_tread64 tread;
memset(&tread, 0, sizeof(tread));
tread.event = SNDRV_TIMER_EVENT_EARLY;
tread.tstamp_sec = 0;
tread.tstamp_nsec = 0;
tread.val = 0;
snd_timer_user_append_to_tqueue(tu, &tread);
} else {
struct snd_timer_read *r = &tu->queue[0];
r->resolution = 0;
r->ticks = 0;
tu->qused++;
tu->qtail++;
}
}
tu->filter = params.filter;
tu->ticks = params.ticks;
}
tu->filter = params.filter;
tu->ticks = params.ticks;
spin_unlock_irq(&tu->qlock);
err = 0;
_end:
if (copy_to_user(_params, &params, sizeof(params)))
@ -1945,9 +1872,8 @@ static int snd_timer_user_status32(struct file *file,
status.resolution = snd_timer_resolution(tu->timeri);
status.lost = tu->timeri->lost;
status.overrun = tu->overrun;
spin_lock_irq(&tu->qlock);
status.queue = tu->qused;
spin_unlock_irq(&tu->qlock);
scoped_guard(spinlock_irq, &tu->qlock)
status.queue = tu->qused;
if (copy_to_user(_status, &status, sizeof(status)))
return -EFAULT;
return 0;
@ -1968,9 +1894,8 @@ static int snd_timer_user_status64(struct file *file,
status.resolution = snd_timer_resolution(tu->timeri);
status.lost = tu->timeri->lost;
status.overrun = tu->overrun;
spin_lock_irq(&tu->qlock);
status.queue = tu->qused;
spin_unlock_irq(&tu->qlock);
scoped_guard(spinlock_irq, &tu->qlock)
status.queue = tu->qused;
if (copy_to_user(_status, &status, sizeof(status)))
return -EFAULT;
return 0;
@ -2128,12 +2053,9 @@ static long snd_timer_user_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct snd_timer_user *tu = file->private_data;
long ret;
mutex_lock(&tu->ioctl_lock);
ret = __snd_timer_user_ioctl(file, cmd, arg, false);
mutex_unlock(&tu->ioctl_lock);
return ret;
guard(mutex)(&tu->ioctl_lock);
return __snd_timer_user_ioctl(file, cmd, arg, false);
}
static int snd_timer_user_fasync(int fd, struct file * file, int on)
@ -2260,12 +2182,11 @@ static __poll_t snd_timer_user_poll(struct file *file, poll_table * wait)
poll_wait(file, &tu->qchange_sleep, wait);
mask = 0;
spin_lock_irq(&tu->qlock);
guard(spinlock_irq)(&tu->qlock);
if (tu->qused)
mask |= EPOLLIN | EPOLLRDNORM;
if (tu->disconnected)
mask |= EPOLLERR;
spin_unlock_irq(&tu->qlock);
return mask;
}

7
sound/core/timer_compat.c
View File

@ -115,10 +115,7 @@ static long snd_timer_user_ioctl_compat(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct snd_timer_user *tu = file->private_data;
long ret;
mutex_lock(&tu->ioctl_lock);
ret = __snd_timer_user_ioctl_compat(file, cmd, arg);
mutex_unlock(&tu->ioctl_lock);
return ret;
guard(mutex)(&tu->ioctl_lock);
return __snd_timer_user_ioctl_compat(file, cmd, arg);
}