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| author | Clemens Ladisch <clemens@ladisch.de> | 2006-10-27 12:45:00 +0400 |
|---|---|---|
| committer | Jaroslav Kysela <perex@suse.cz> | 2006-11-28 15:46:33 +0300 |
| commit | ac5d1a7d253f3c02d1e5c93edfa26e81466ec71e (patch) | |
| tree | 629e4d8618d11233c2e24daf28aa12f055dc24c3 /sound/core | |
| parent | 2ea5814472c3c910aed5c5b60f1f3b1000e353f1 (diff) | |
| download | linux-ac5d1a7d253f3c02d1e5c93edfa26e81466ec71e.tar.xz | |
[ALSA] rtctimer: handle RTC interrupts with a tasklet
The calls to rtc_control() from inside the interrupt handler can upset
the RTC code, so move our interrupt handling code to a tasklet.
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
Diffstat (limited to 'sound/core')
| -rw-r--r-- | sound/core/rtctimer.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/sound/core/rtctimer.c b/sound/core/rtctimer.c index 412dd62b654e..9f7b32e1ccde 100644 --- a/sound/core/rtctimer.c +++ b/sound/core/rtctimer.c @@ -22,13 +22,10 @@ #include <sound/driver.h> #include <linux/init.h> -#include <linux/time.h> -#include <linux/threads.h> #include <linux/interrupt.h> #include <linux/moduleparam.h> #include <sound/core.h> #include <sound/timer.h> -#include <sound/info.h> #if defined(CONFIG_RTC) || defined(CONFIG_RTC_MODULE) @@ -50,7 +47,9 @@ static int rtctimer_stop(struct snd_timer *t); * The hardware dependent description for this timer. */ static struct snd_timer_hardware rtc_hw = { - .flags = SNDRV_TIMER_HW_FIRST|SNDRV_TIMER_HW_AUTO, + .flags = SNDRV_TIMER_HW_AUTO | + SNDRV_TIMER_HW_FIRST | + SNDRV_TIMER_HW_TASKLET, .ticks = 100000000L, /* FIXME: XXX */ .open = rtctimer_open, .close = rtctimer_close, @@ -60,6 +59,7 @@ static struct snd_timer_hardware rtc_hw = { static int rtctimer_freq = RTC_FREQ; /* frequency */ static struct snd_timer *rtctimer; +static struct tasklet_struct rtc_tasklet; static rtc_task_t rtc_task; @@ -81,6 +81,7 @@ rtctimer_close(struct snd_timer *t) rtc_task_t *rtc = t->private_data; if (rtc) { rtc_unregister(rtc); + tasklet_kill(&rtc_tasklet); t->private_data = NULL; } return 0; @@ -105,12 +106,17 @@ rtctimer_stop(struct snd_timer *timer) return 0; } +static void rtctimer_tasklet(unsigned long data) +{ + snd_timer_interrupt((struct snd_timer *)data, 1); +} + /* * interrupt */ static void rtctimer_interrupt(void *private_data) { - snd_timer_interrupt(private_data, 1); + tasklet_hi_schedule(private_data); } @@ -139,9 +145,11 @@ static int __init rtctimer_init(void) timer->hw = rtc_hw; timer->hw.resolution = NANO_SEC / rtctimer_freq; + tasklet_init(&rtc_tasklet, rtctimer_tasklet, (unsigned long)timer); + /* set up RTC callback */ rtc_task.func = rtctimer_interrupt; - rtc_task.private_data = timer; + rtc_task.private_data = &rtc_tasklet; err = snd_timer_global_register(timer); if (err < 0) { |