ALSA: firewire-lib: obsolete workqueue for period update

The workqueue to notify PCM period elapse is not used anymore.
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20210610031733.56297-4-o-takashi@sakamocchi.jpSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/firewire/amdtp-stream.c

@@ -77,8 +77,6 @@
 // overrun. Actual device can skip more, then this module stops the packet streaming.
 #define IR_JUMBO_PAYLOAD_MAX_SKIP_CYCLES	5
 
-static void pcm_period_work(struct work_struct *work);
-
 /**
  * amdtp_stream_init - initialize an AMDTP stream structure
  * @s: the AMDTP stream to initialize
@@ -107,7 +105,6 @@ int amdtp_stream_init(struct amdtp_stream *s, struct fw_unit *unit,
 	s->flags = flags;
 	s->context = ERR_PTR(-1);
 	mutex_init(&s->mutex);
-	INIT_WORK(&s->period_work, pcm_period_work);
 	s->packet_index = 0;
 
 	init_waitqueue_head(&s->ready_wait);
@@ -346,7 +343,6 @@ EXPORT_SYMBOL(amdtp_stream_get_max_payload);
  */
 void amdtp_stream_pcm_prepare(struct amdtp_stream *s)
 {
-	cancel_work_sync(&s->period_work);
 	s->pcm_buffer_pointer = 0;
 	s->pcm_period_pointer = 0;
 }
@@ -626,16 +622,6 @@ static void update_pcm_pointers(struct amdtp_stream *s,
 	}
 }
 
-static void pcm_period_work(struct work_struct *work)
-{
-	struct amdtp_stream *s = container_of(work, struct amdtp_stream,
-					      period_work);
-	struct snd_pcm_substream *pcm = READ_ONCE(s->pcm);
-
-	if (pcm)
-		snd_pcm_period_elapsed(pcm);
-}
-
 static int queue_packet(struct amdtp_stream *s, struct fw_iso_packet *params,
 			bool sched_irq)
 {
@@ -1808,7 +1794,6 @@ static void amdtp_stream_stop(struct amdtp_stream *s)
 		return;
 	}
 
-	cancel_work_sync(&s->period_work);
 	fw_iso_context_stop(s->context);
 	fw_iso_context_destroy(s->context);
 	s->context = ERR_PTR(-1);

sound/firewire/amdtp-stream.h

@@ -186,7 +186,6 @@ struct amdtp_stream {
 
 	/* For a PCM substream processing. */
 	struct snd_pcm_substream *pcm;
-	struct work_struct period_work;
 	snd_pcm_uframes_t pcm_buffer_pointer;
 	unsigned int pcm_period_pointer;