linux-kernel - [PATCH] ASoC: fsl: fsl_qmc_audio: Reset audio data pointers on TRIGGER

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Message-ID: <20250410091643.535627-1-herve.codina@bootlin.com>
Date: Thu, 10 Apr 2025 11:16:43 +0200
From: Herve Codina <herve.codina@...tlin.com>
To: Herve Codina <herve.codina@...tlin.com>,
	Shengjiu Wang <shengjiu.wang@...il.com>,
	Xiubo Li <Xiubo.Lee@...il.com>,
	Fabio Estevam <festevam@...il.com>,
	Nicolin Chen <nicoleotsuka@...il.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Christophe Leroy <christophe.leroy@...roup.eu>
Cc: linux-sound@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	stable@...r.kernel.org
Subject: [PATCH] ASoC: fsl: fsl_qmc_audio: Reset audio data pointers on TRIGGER_START event

On SNDRV_PCM_TRIGGER_START event, audio data pointers are not reset.

This leads to wrong data buffer usage when multiple TRIGGER_START are
received and ends to incorrect buffer usage between the user-space and
the driver. Indeed, the driver can read data that are not already set by
the user-space or the user-space and the driver are writing and reading
the same area.

Fix that resetting data pointers on each SNDRV_PCM_TRIGGER_START events.

Fixes: 075c7125b11c ("ASoC: fsl: Add support for QMC audio")
Cc: stable@...r.kernel.org
Signed-off-by: Herve Codina <herve.codina@...tlin.com>
---
 sound/soc/fsl/fsl_qmc_audio.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/fsl/fsl_qmc_audio.c b/sound/soc/fsl/fsl_qmc_audio.c
index b2979290c973..5614a8b909ed 100644
--- a/sound/soc/fsl/fsl_qmc_audio.c
+++ b/sound/soc/fsl/fsl_qmc_audio.c
@@ -250,6 +250,9 @@ static int qmc_audio_pcm_trigger(struct snd_soc_component *component,
 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 		bitmap_zero(prtd->chans_pending, 64);
+		prtd->buffer_ended = 0;
+		prtd->ch_dma_addr_current = prtd->ch_dma_addr_start;
+
 		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 			for (i = 0; i < prtd->channels; i++)
 				prtd->qmc_dai->chans[i].prtd_tx = prtd;
-- 
2.49.0