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Diffstat (limited to 'sound/core/timer.c')
-rw-r--r--sound/core/timer.c125
1 files changed, 60 insertions, 65 deletions
diff --git a/sound/core/timer.c b/sound/core/timer.c
index 884c3066b028..a9b9a277e00c 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -319,6 +319,7 @@ int snd_timer_open(struct snd_timer_instance **ti,
*ti = timeri;
return 0;
}
+EXPORT_SYMBOL(snd_timer_open);
/*
* close a timer instance
@@ -384,6 +385,7 @@ int snd_timer_close(struct snd_timer_instance *timeri)
mutex_unlock(&register_mutex);
return 0;
}
+EXPORT_SYMBOL(snd_timer_close);
unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
{
@@ -398,6 +400,7 @@ unsigned long snd_timer_resolution(struct snd_timer_instance *timeri)
}
return 0;
}
+EXPORT_SYMBOL(snd_timer_resolution);
static void snd_timer_notify1(struct snd_timer_instance *ti, int event)
{
@@ -589,6 +592,7 @@ int snd_timer_start(struct snd_timer_instance *timeri, unsigned int ticks)
else
return snd_timer_start1(timeri, true, ticks);
}
+EXPORT_SYMBOL(snd_timer_start);
/*
* stop the timer instance.
@@ -602,6 +606,7 @@ int snd_timer_stop(struct snd_timer_instance *timeri)
else
return snd_timer_stop1(timeri, true);
}
+EXPORT_SYMBOL(snd_timer_stop);
/*
* start again.. the tick is kept.
@@ -617,6 +622,7 @@ int snd_timer_continue(struct snd_timer_instance *timeri)
else
return snd_timer_start1(timeri, false, 0);
}
+EXPORT_SYMBOL(snd_timer_continue);
/*
* pause.. remember the ticks left
@@ -628,6 +634,7 @@ int snd_timer_pause(struct snd_timer_instance * timeri)
else
return snd_timer_stop1(timeri, false);
}
+EXPORT_SYMBOL(snd_timer_pause);
/*
* reschedule the timer
@@ -809,6 +816,7 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
if (use_tasklet)
tasklet_schedule(&timer->task_queue);
}
+EXPORT_SYMBOL(snd_timer_interrupt);
/*
@@ -859,6 +867,7 @@ int snd_timer_new(struct snd_card *card, char *id, struct snd_timer_id *tid,
*rtimer = timer;
return 0;
}
+EXPORT_SYMBOL(snd_timer_new);
static int snd_timer_free(struct snd_timer *timer)
{
@@ -978,6 +987,7 @@ void snd_timer_notify(struct snd_timer *timer, int event, struct timespec *tstam
}
spin_unlock_irqrestore(&timer->lock, flags);
}
+EXPORT_SYMBOL(snd_timer_notify);
/*
* exported functions for global timers
@@ -993,11 +1003,13 @@ int snd_timer_global_new(char *id, int device, struct snd_timer **rtimer)
tid.subdevice = 0;
return snd_timer_new(NULL, id, &tid, rtimer);
}
+EXPORT_SYMBOL(snd_timer_global_new);
int snd_timer_global_free(struct snd_timer *timer)
{
return snd_timer_free(timer);
}
+EXPORT_SYMBOL(snd_timer_global_free);
int snd_timer_global_register(struct snd_timer *timer)
{
@@ -1007,6 +1019,7 @@ int snd_timer_global_register(struct snd_timer *timer)
dev.device_data = timer;
return snd_timer_dev_register(&dev);
}
+EXPORT_SYMBOL(snd_timer_global_register);
/*
* System timer
@@ -1327,6 +1340,33 @@ static void snd_timer_user_tinterrupt(struct snd_timer_instance *timeri,
wake_up(&tu->qchange_sleep);
}
+static int realloc_user_queue(struct snd_timer_user *tu, int size)
+{
+ struct snd_timer_read *queue = NULL;
+ struct snd_timer_tread *tqueue = NULL;
+
+ if (tu->tread) {
+ tqueue = kcalloc(size, sizeof(*tqueue), GFP_KERNEL);
+ if (!tqueue)
+ return -ENOMEM;
+ } else {
+ queue = kcalloc(size, sizeof(*queue), GFP_KERNEL);
+ if (!queue)
+ return -ENOMEM;
+ }
+
+ spin_lock_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;
+}
+
static int snd_timer_user_open(struct inode *inode, struct file *file)
{
struct snd_timer_user *tu;
@@ -1343,10 +1383,7 @@ static int snd_timer_user_open(struct inode *inode, struct file *file)
init_waitqueue_head(&tu->qchange_sleep);
mutex_init(&tu->ioctl_lock);
tu->ticks = 1;
- tu->queue_size = 128;
- tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
- GFP_KERNEL);
- if (tu->queue == NULL) {
+ if (realloc_user_queue(tu, 128) < 0) {
kfree(tu);
return -ENOMEM;
}
@@ -1618,34 +1655,12 @@ static int snd_timer_user_tselect(struct file *file,
if (err < 0)
goto __err;
- tu->qhead = tu->qtail = tu->qused = 0;
- kfree(tu->queue);
- tu->queue = NULL;
- kfree(tu->tqueue);
- tu->tqueue = NULL;
- if (tu->tread) {
- tu->tqueue = kmalloc(tu->queue_size * sizeof(struct snd_timer_tread),
- GFP_KERNEL);
- if (tu->tqueue == NULL)
- err = -ENOMEM;
- } else {
- tu->queue = kmalloc(tu->queue_size * sizeof(struct snd_timer_read),
- GFP_KERNEL);
- if (tu->queue == NULL)
- err = -ENOMEM;
- }
-
- if (err < 0) {
- snd_timer_close(tu->timeri);
- tu->timeri = NULL;
- } else {
- tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
- tu->timeri->callback = tu->tread
+ tu->timeri->flags |= SNDRV_TIMER_IFLG_FAST;
+ tu->timeri->callback = tu->tread
? snd_timer_user_tinterrupt : snd_timer_user_interrupt;
- tu->timeri->ccallback = snd_timer_user_ccallback;
- tu->timeri->callback_data = (void *)tu;
- tu->timeri->disconnect = snd_timer_user_disconnect;
- }
+ tu->timeri->ccallback = snd_timer_user_ccallback;
+ tu->timeri->callback_data = (void *)tu;
+ tu->timeri->disconnect = snd_timer_user_disconnect;
__err:
return err;
@@ -1687,8 +1702,6 @@ static int snd_timer_user_params(struct file *file,
struct snd_timer_user *tu;
struct snd_timer_params params;
struct snd_timer *t;
- struct snd_timer_read *tr;
- struct snd_timer_tread *ttr;
int err;
tu = file->private_data;
@@ -1751,24 +1764,11 @@ static int snd_timer_user_params(struct file *file,
spin_unlock_irq(&t->lock);
if (params.queue_size > 0 &&
(unsigned int)tu->queue_size != params.queue_size) {
- if (tu->tread) {
- ttr = kmalloc(params.queue_size * sizeof(*ttr),
- GFP_KERNEL);
- if (ttr) {
- kfree(tu->tqueue);
- tu->queue_size = params.queue_size;
- tu->tqueue = ttr;
- }
- } else {
- tr = kmalloc(params.queue_size * sizeof(*tr),
- GFP_KERNEL);
- if (tr) {
- kfree(tu->queue);
- tu->queue_size = params.queue_size;
- tu->queue = tr;
- }
- }
+ 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) {
@@ -1789,6 +1789,7 @@ static int snd_timer_user_params(struct file *file,
}
tu->filter = params.filter;
tu->ticks = params.ticks;
+ spin_unlock_irq(&tu->qlock);
err = 0;
_end:
if (copy_to_user(_params, &params, sizeof(params)))
@@ -1891,13 +1892,19 @@ static long __snd_timer_user_ioctl(struct file *file, unsigned int cmd,
return snd_timer_user_next_device(argp);
case SNDRV_TIMER_IOCTL_TREAD:
{
- int xarg;
+ int xarg, old_tread;
if (tu->timeri) /* too late */
return -EBUSY;
if (get_user(xarg, p))
return -EFAULT;
+ old_tread = tu->tread;
tu->tread = xarg ? 1 : 0;
+ if (tu->tread != old_tread &&
+ realloc_user_queue(tu, tu->queue_size) < 0) {
+ tu->tread = old_tread;
+ return -ENOMEM;
+ }
return 0;
}
case SNDRV_TIMER_IOCTL_GINFO:
@@ -2030,10 +2037,12 @@ static unsigned int snd_timer_user_poll(struct file *file, poll_table * wait)
poll_wait(file, &tu->qchange_sleep, wait);
mask = 0;
+ spin_lock_irq(&tu->qlock);
if (tu->qused)
mask |= POLLIN | POLLRDNORM;
if (tu->disconnected)
mask |= POLLERR;
+ spin_unlock_irq(&tu->qlock);
return mask;
}
@@ -2117,17 +2126,3 @@ static void __exit alsa_timer_exit(void)
module_init(alsa_timer_init)
module_exit(alsa_timer_exit)
-
-EXPORT_SYMBOL(snd_timer_open);
-EXPORT_SYMBOL(snd_timer_close);
-EXPORT_SYMBOL(snd_timer_resolution);
-EXPORT_SYMBOL(snd_timer_start);
-EXPORT_SYMBOL(snd_timer_stop);
-EXPORT_SYMBOL(snd_timer_continue);
-EXPORT_SYMBOL(snd_timer_pause);
-EXPORT_SYMBOL(snd_timer_new);
-EXPORT_SYMBOL(snd_timer_notify);
-EXPORT_SYMBOL(snd_timer_global_new);
-EXPORT_SYMBOL(snd_timer_global_free);
-EXPORT_SYMBOL(snd_timer_global_register);
-EXPORT_SYMBOL(snd_timer_interrupt);
generated by cgit (git 2.34.1) at 2024-05-17 22:02:26 +0000