[PATCH] ASoC: SOF: fix uninitialised "work" with VirtIO

[Guennadi Liakhovetski]

In the VirtIO case the sof_pcm_open() function isn't called on the
host during guest streaming, which then leaves "work" structures
uninitialised. However it is then used to handle position update
messages from the DSP. Move their initialisation to immediately after
allocation of the containing structure.

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski at linux.intel.com>
---

This is a re-send of "[PATCH 08/14] ASoC: SOF: fix uninitialised "work" 
with VirtIO" as suggested by Mark, also taking into account a comment 
from Ranjani - thanks. Note: I haven't sent patches before from mutt, 
hope this will work, if not - will have to re-send.

 sound/soc/sof/pcm.c       |  4 +---
 sound/soc/sof/sof-audio.h |  3 +++
 sound/soc/sof/topology.c  | 17 ++++++++++++-----
 3 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/sound/soc/sof/pcm.c b/sound/soc/sof/pcm.c
index f4769e1..47cd741 100644
--- a/sound/soc/sof/pcm.c
+++ b/sound/soc/sof/pcm.c
@@ -57,7 +57,7 @@ static int sof_pcm_dsp_params(struct snd_sof_pcm *spcm, struct snd_pcm_substream
 /*
  * sof pcm period elapse work
  */
-static void sof_pcm_period_elapsed_work(struct work_struct *work)
+void snd_sof_pcm_period_elapsed_work(struct work_struct *work)
 {
 	struct snd_sof_pcm_stream *sps =
 		container_of(work, struct snd_sof_pcm_stream,
@@ -475,8 +475,6 @@ static int sof_pcm_open(struct snd_soc_component *component,
 	dev_dbg(component->dev, "pcm: open stream %d dir %d\n",
 		spcm->pcm.pcm_id, substream->stream);
 
-	INIT_WORK(&spcm->stream[substream->stream].period_elapsed_work,
-		  sof_pcm_period_elapsed_work);
 
 	caps = &spcm->pcm.caps[substream->stream];
 
diff --git a/sound/soc/sof/sof-audio.h b/sound/soc/sof/sof-audio.h
index eacd10e..bf65f31a 100644
--- a/sound/soc/sof/sof-audio.h
+++ b/sound/soc/sof/sof-audio.h
@@ -11,6 +11,8 @@
 #ifndef __SOUND_SOC_SOF_AUDIO_H
 #define __SOUND_SOC_SOF_AUDIO_H
 
+#include <linux/workqueue.h>
+
 #include <sound/soc.h>
 #include <sound/control.h>
 #include <sound/sof/stream.h> /* needs to be included before control.h */
@@ -189,6 +191,7 @@ struct snd_sof_pcm *snd_sof_find_spcm_comp(struct snd_soc_component *scomp,
 struct snd_sof_pcm *snd_sof_find_spcm_pcm_id(struct snd_soc_component *scomp,
 					     unsigned int pcm_id);
 void snd_sof_pcm_period_elapsed(struct snd_pcm_substream *substream);
+void snd_sof_pcm_period_elapsed_work(struct work_struct *work);
 
 /*
  * Mixer IPC
diff --git a/sound/soc/sof/topology.c b/sound/soc/sof/topology.c
index 058de94..fe8ba3e 100644
--- a/sound/soc/sof/topology.c
+++ b/sound/soc/sof/topology.c
@@ -9,6 +9,7 @@
 //
 
 #include <linux/firmware.h>
+#include <linux/workqueue.h>
 #include <sound/tlv.h>
 #include <sound/pcm_params.h>
 #include <uapi/sound/sof/tokens.h>
@@ -2448,7 +2449,7 @@ static int sof_dai_load(struct snd_soc_component *scomp, int index,
 	struct snd_soc_tplg_stream_caps *caps;
 	struct snd_soc_tplg_private *private = &pcm->priv;
 	struct snd_sof_pcm *spcm;
-	int stream = SNDRV_PCM_STREAM_PLAYBACK;
+	int stream;
 	int ret = 0;
 
 	/* nothing to do for BEs atm */
@@ -2460,8 +2461,12 @@ static int sof_dai_load(struct snd_soc_component *scomp, int index,
 		return -ENOMEM;
 
 	spcm->scomp = scomp;
-	spcm->stream[SNDRV_PCM_STREAM_PLAYBACK].comp_id = COMP_ID_UNASSIGNED;
-	spcm->stream[SNDRV_PCM_STREAM_CAPTURE].comp_id = COMP_ID_UNASSIGNED;
+
+	for_each_pcm_streams(stream) {
+		spcm->stream[stream].comp_id = COMP_ID_UNASSIGNED;
+		INIT_WORK(&spcm->stream[stream].period_elapsed_work,
+			  snd_sof_pcm_period_elapsed_work);
+	}
 
 	spcm->pcm = *pcm;
 	dev_dbg(scomp->dev, "tplg: load pcm %s\n", pcm->dai_name);
@@ -2482,8 +2487,10 @@ static int sof_dai_load(struct snd_soc_component *scomp, int index,
 	if (!spcm->pcm.playback)
 		goto capture;
 
+	stream = SNDRV_PCM_STREAM_PLAYBACK;
+
 	dev_vdbg(scomp->dev, "tplg: pcm %s stream tokens: playback d0i3:%d\n",
-		 spcm->pcm.pcm_name, spcm->stream[0].d0i3_compatible);
+		 spcm->pcm.pcm_name, spcm->stream[stream].d0i3_compatible);
 
 	caps = &spcm->pcm.caps[stream];
 
@@ -2513,7 +2520,7 @@ static int sof_dai_load(struct snd_soc_component *scomp, int index,
 		return ret;
 
 	dev_vdbg(scomp->dev, "tplg: pcm %s stream tokens: capture d0i3:%d\n",
-		 spcm->pcm.pcm_name, spcm->stream[1].d0i3_compatible);
+		 spcm->pcm.pcm_name, spcm->stream[stream].d0i3_compatible);
 
 	caps = &spcm->pcm.caps[stream];
 
-- 
1.9.3