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authorClemens Ladisch <clemens@ladisch.de>2006-10-27 10:45:00 +0200
committerJaroslav Kysela <perex@suse.cz>2006-11-28 13:46:33 +0100
commitac5d1a7d253f3c02d1e5c93edfa26e81466ec71e (patch)
tree629e4d8618d11233c2e24daf28aa12f055dc24c3 /sound/core/rtctimer.c
parent2ea5814472c3c910aed5c5b60f1f3b1000e353f1 (diff)
downloadlwn-ac5d1a7d253f3c02d1e5c93edfa26e81466ec71e.tar.gz
lwn-ac5d1a7d253f3c02d1e5c93edfa26e81466ec71e.zip
[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/rtctimer.c')
-rw-r--r--sound/core/rtctimer.c20
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) {