6.12-stable review patch. If anyone has any objections, please let me know.
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From: Herve Codina herve.codina@bootlin.com
commit 9aa33d5b4a53a1945dd2aee45c09282248d3c98b upstream.
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@vger.kernel.org Signed-off-by: Herve Codina herve.codina@bootlin.com Link: https://patch.msgid.link/20250410091643.535627-1-herve.codina@bootlin.com Signed-off-by: Mark Brown broonie@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- sound/soc/fsl/fsl_qmc_audio.c | 3 +++ 1 file changed, 3 insertions(+)
--- 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 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;