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[ALSA] timers: add module refcounting for global timers 

Modules: RTC timer driver,Timer Midlevel

Add a module pointer to the timer structure and use it for refcounting
instead of the card's module pointer to prevent the global timer
modules (rtctimer and hpetimer) from being removed while in use.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
This commit is contained in:
Clemens Ladisch 2005-10-12 17:12:31 +02:00 committed by Jaroslav Kysela
parent 2fd43d1159
commit de24214d0c
3 changed files with 8 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/sound/timer.h
View File

@ -88,6 +88,7 @@ struct _snd_timer_hardware {
struct _snd_timer { struct _snd_timer {
snd_timer_class_t tmr_class; snd_timer_class_t tmr_class;
snd_card_t *card; snd_card_t *card;
struct module *module;
int tmr_device; int tmr_device;
int tmr_subdevice; int tmr_subdevice;
char id[64]; char id[64];

4
sound/core/rtctimer.c
View File

@ -124,7 +124,8 @@ static int __init rtctimer_init(void)
if (rtctimer_freq < 2 || rtctimer_freq > 8192 || if (rtctimer_freq < 2 || rtctimer_freq > 8192 ||
(rtctimer_freq & (rtctimer_freq - 1)) != 0) { (rtctimer_freq & (rtctimer_freq - 1)) != 0) {
snd_printk(KERN_ERR "rtctimer: invalid frequency %d\n", rtctimer_freq); snd_printk(KERN_ERR "rtctimer: invalid frequency %d\n",
rtctimer_freq);
return -EINVAL; return -EINVAL;
} }
@ -133,6 +134,7 @@ static int __init rtctimer_init(void)
if (err < 0) if (err < 0)
return err; return err;
timer->module = THIS_MODULE;
strcpy(timer->name, "RTC timer"); strcpy(timer->name, "RTC timer");
timer->hw = rtc_hw; timer->hw = rtc_hw;
timer->hw.resolution = NANO_SEC / rtctimer_freq; timer->hw.resolution = NANO_SEC / rtctimer_freq;

7
sound/core/timer.c
View File

@ -113,7 +113,7 @@ static snd_timer_instance_t *snd_timer_instance_new(char *owner, snd_timer_t *ti
INIT_LIST_HEAD(&timeri->slave_active_head); INIT_LIST_HEAD(&timeri->slave_active_head);
timeri->timer = timer; timeri->timer = timer;
if (timer && timer->card && !try_module_get(timer->card->module)) { if (timer && !try_module_get(timer->module)) {
kfree(timeri->owner); kfree(timeri->owner);
kfree(timeri); kfree(timeri);
return NULL; return NULL;
@ -363,8 +363,8 @@ int snd_timer_close(snd_timer_instance_t * timeri)
timeri->private_free(timeri); timeri->private_free(timeri);
kfree(timeri->owner); kfree(timeri->owner);
kfree(timeri); kfree(timeri);
if (timer && timer->card) if (timer)
module_put(timer->card->module); module_put(timer->module);
return 0; return 0;
} }
@ -787,6 +787,7 @@ int snd_timer_new(snd_card_t *card, char *id, snd_timer_id_t *tid, snd_timer_t *
spin_lock_init(&timer->lock); spin_lock_init(&timer->lock);
tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer); tasklet_init(&timer->task_queue, snd_timer_tasklet, (unsigned long)timer);
if (card != NULL) { if (card != NULL) {
timer->module = card->module;
if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) { if ((err = snd_device_new(card, SNDRV_DEV_TIMER, timer, &ops)) < 0) {
snd_timer_free(timer); snd_timer_free(timer);
return err; return err;