From 9ef91cad92ba75d17d5a5203230746c9d9009705 Mon Sep 17 00:00:00 2001
From: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Date: Wed, 25 Mar 2020 16:12:31 -0500
Subject: [PATCH] ASoC: SOF: fix uninitialised "work" with VirtIO
Git-commit: 9ef91cad92ba75d17d5a5203230746c9d9009705
Patch-mainline: v5.7-rc1
References: jsc#SLE-16518

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@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20200325211233.27394-4-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 sound/soc/sof/pcm.c       | 4 +---
 sound/soc/sof/sof-audio.h | 3 +++
 sound/soc/sof/topology.c  | 6 +++++-
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/sound/soc/sof/pcm.c b/sound/soc/sof/pcm.c
index f4769e19965a..47cd741f2a8c 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 eacd10e4da11..bf65f31af858 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 54437caf9488..fe8ba3e05e08 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>
@@ -2461,8 +2462,11 @@ static int sof_dai_load(struct snd_soc_component *scomp, int index,
 
 	spcm->scomp = scomp;
 
-	for_each_pcm_streams(stream)
+	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);
-- 
2.16.4