1 files changed, 14 insertions, 17 deletions

diff --git a/sound/firewire/amdtp-stream.c b/sound/firewire/amdtp-stream.c
index 150ee0b9e707..426a85b56cf1 100644
--- a/sound/firewire/amdtp-stream.c
+++ b/sound/firewire/amdtp-stream.c
@@ -613,8 +613,16 @@ static void update_pcm_pointers(struct amdtp_stream *s,
 		// The program in user process should periodically check the status of intermediate
 		// buffer associated to PCM substream to process PCM frames in the buffer, instead
 		// of receiving notification of period elapsed by poll wait.
-		if (!pcm->runtime->no_period_wakeup)
-			queue_work(system_highpri_wq, &s->period_work);
+		if (!pcm->runtime->no_period_wakeup) {
+			if (in_interrupt()) {
+				// In software IRQ context for 1394 OHCI.
+				snd_pcm_period_elapsed(pcm);
+			} else {
+				// In process context of ALSA PCM application under acquired lock of
+				// PCM substream.
+				snd_pcm_period_elapsed_under_stream_lock(pcm);
+			}
+		}
 	}
 }
 
@@ -1740,22 +1748,11 @@ unsigned long amdtp_domain_stream_pcm_pointer(struct amdtp_domain *d,
 {
 	struct amdtp_stream *irq_target = d->irq_target;
 
+	// Process isochronous packets queued till recent isochronous cycle to handle PCM frames.
 	if (irq_target && amdtp_stream_running(irq_target)) {
-		// This function is called in software IRQ context of
-		// period_work or process context.
-		//
-		// When the software IRQ context was scheduled by software IRQ
-		// context of IT contexts, queued packets were already handled.
-		// Therefore, no need to flush the queue in buffer furthermore.
-		//
-		// When the process context reach here, some packets will be
-		// already queued in the buffer. These packets should be handled
-		// immediately to keep better granularity of PCM pointer.
-		//
-		// Later, the process context will sometimes schedules software
-		// IRQ context of the period_work. Then, no need to flush the
-		// queue by the same reason as described in the above
-		if (current_work() != &s->period_work)
+		// In software IRQ context, the call causes dead-lock to disable the tasklet
+		// synchronously.
+		if (!in_interrupt())
 			fw_iso_context_flush_completions(irq_target->context);
 	}