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ALSA: pcsp: Replace tasklet with work

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The tasklet is an old API that should be deprecated, usually can be
converted to another decent API.  This patch replaces the usage of
tasklet in pcsp driver with a simple work.  In pcsp driver, a global
tasklet is used for offloading the period-elapse handling in the
hrtimer callback (introduced in commit 96c7d478ef "ALSA: pcsp - Fix
locking messes in snd-pcsp").  It can be achieved gracefully with a
work queued in the high-prio system workqueue.

This also changes tasklet_kill() with cancel_work_sync() in the
sync_stop callback, which is anyway better to assure canceling the
pending tasks.

Link: https://lore.kernel.org/r/20200903104131.21097-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2020-09-03 12:41:21 +02:00
parent 9ddb236f13
commit 68f86a905e
1 changed files with 5 additions and 7 deletions
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12
sound/drivers/pcsp/pcsp_lib.c
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@ -23,10 +23,10 @@ MODULE_PARM_DESC(nforce_wa, "Apply NForce chipset workaround "
#define DMIX_WANTS_S16 1
/*
* Call snd_pcm_period_elapsed in a tasklet
* Call snd_pcm_period_elapsed in a work
* This avoids spinlock messes and long-running irq contexts
*/
static void pcsp_call_pcm_elapsed(unsigned long priv)
static void pcsp_call_pcm_elapsed(struct work_struct *work)
{
if (atomic_read(&pcsp_chip.timer_active)) {
struct snd_pcm_substream *substream;
@ -36,7 +36,7 @@ static void pcsp_call_pcm_elapsed(unsigned long priv)
}
}
static DECLARE_TASKLET_OLD(pcsp_pcm_tasklet, pcsp_call_pcm_elapsed);
static DECLARE_WORK(pcsp_pcm_work, pcsp_call_pcm_elapsed);
/* write the port and returns the next expire time in ns;
* called at the trigger-start and in hrtimer callback
@ -119,11 +119,9 @@ static void pcsp_pointer_update(struct snd_pcsp *chip)
if (periods_elapsed) {
chip->period_ptr += periods_elapsed * period_bytes;
chip->period_ptr %= buffer_bytes;
queue_work(system_highpri_wq, &pcsp_pcm_work);
}
spin_unlock_irqrestore(&chip->substream_lock, flags);
if (periods_elapsed)
tasklet_schedule(&pcsp_pcm_tasklet);
}
enum hrtimer_restart pcsp_do_timer(struct hrtimer *handle)
@ -196,7 +194,7 @@ void pcsp_sync_stop(struct snd_pcsp *chip)
pcsp_stop_playing(chip);
local_irq_enable();
hrtimer_cancel(&chip->timer);
tasklet_kill(&pcsp_pcm_tasklet);
cancel_work_sync(&pcsp_pcm_work);
}
static int snd_pcsp_playback_close(struct snd_pcm_substream *substream)