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ALSA: aloop: Replace tasklet with work 

The tasklet is an old API that should be deprecated, usually can be
converted to another decent API.  In aloop driver, a tasklet is still
used for offloading the timer event task.  It can be achieved
gracefully with a work queued, too.

This patch replaces the tasklet usage in aloop driver with a simple
work.

Link: https://lore.kernel.org/r/20200903104131.21097-6-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2020-09-03 12:41:25 +02:00
parent 45e4d67f8a
commit 6053a71247
1 changed files with 11 additions and 12 deletions
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23
sound/drivers/aloop.c
View File

@ -110,7 +110,7 @@ struct loopback_cable {
struct {
int stream;
struct snd_timer_id id;
struct tasklet_struct event_tasklet;
struct work_struct event_work;
struct snd_timer_instance *instance;
} snd_timer;
};
@ -309,8 +309,8 @@ static int loopback_snd_timer_close_cable(struct loopback_pcm *dpcm)
*/
snd_timer_close(cable->snd_timer.instance);
/* wait till drain tasklet has finished if requested */
tasklet_kill(&cable->snd_timer.event_tasklet);
/* wait till drain work has finished if requested */
cancel_work_sync(&cable->snd_timer.event_work);
snd_timer_instance_free(cable->snd_timer.instance);
memset(&cable->snd_timer, 0, sizeof(cable->snd_timer));
@ -794,11 +794,11 @@ static void loopback_snd_timer_function(struct snd_timer_instance *timeri,
resolution);
}
static void loopback_snd_timer_tasklet(unsigned long arg)
static void loopback_snd_timer_work(struct work_struct *work)
{
struct snd_timer_instance *timeri = (struct snd_timer_instance *)arg;
struct loopback_cable *cable = timeri->callback_data;
struct loopback_cable *cable;
cable = container_of(work, struct loopback_cable, snd_timer.event_work);
loopback_snd_timer_period_elapsed(cable, SNDRV_TIMER_EVENT_MSTOP, 0);
}
@ -828,9 +828,9 @@ static void loopback_snd_timer_event(struct snd_timer_instance *timeri,
* state the streaming will be aborted by the usual timeout. It
* should not be aborted here because may be the timer sound
* card does only a recovery and the timer is back soon.
* This tasklet triggers loopback_snd_timer_tasklet()
* This work triggers loopback_snd_timer_work()
*/
tasklet_schedule(&cable->snd_timer.event_tasklet);
schedule_work(&cable->snd_timer.event_work);
}
}
@ -1124,7 +1124,7 @@ static int loopback_snd_timer_open(struct loopback_pcm *dpcm)
err = -ENOMEM;
goto exit;
}
/* The callback has to be called from another tasklet. If
/* The callback has to be called from another work. If
* SNDRV_TIMER_IFLG_FAST is specified it will be called from the
* snd_pcm_period_elapsed() call of the selected sound card.
* snd_pcm_period_elapsed() helds snd_pcm_stream_lock_irqsave().
@ -1137,9 +1137,8 @@ static int loopback_snd_timer_open(struct loopback_pcm *dpcm)
timeri->callback_data = (void *)cable;
timeri->ccallback = loopback_snd_timer_event;
/* initialise a tasklet used for draining */
tasklet_init(&cable->snd_timer.event_tasklet,
loopback_snd_timer_tasklet, (unsigned long)timeri);
/* initialise a work used for draining */
INIT_WORK(&cable->snd_timer.event_work, loopback_snd_timer_work);
/* The mutex loopback->cable_lock is kept locked.
* Therefore snd_timer_open() cannot be called a second time