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From: Richard Acayan <mailingradian@gmail.com>
To: Srinivas Kandagatla <srini@kernel.org>,
	Liam Girdwood <lgirdwood@gmail.com>,
	Mark Brown <broonie@kernel.org>, Jaroslav Kysela <perex@perex.cz>,
	Takashi Iwai <tiwai@suse.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Richard Acayan <mailingradian@gmail.com>,
	Kees Cook <kees@kernel.org>,
	Joris Verhaegen <verhaegen@google.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
	linux-sound@vger.kernel.org, linux-arm-msm@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: ASoC q6asm race condition when stopping and preparing the stream
Date: Fri, 1 May 2026 10:41:49 -0400	[thread overview]
Message-ID: <afS7rTHdc9TyIeLx@rdacayan> (raw)

Hi,

There seems to be a race condition in q6asm when stopping the stream
(with uncompressed PCM). When receiving SNDRV_PCM_TRIGGER_STOP, the
driver sets the state to Q6ASM_STREAM_STOPPED and sends CMD_EOS to the
ADSP. If userspace decides to prepare the stream again in
q6asm_dai_prepare before receiving ASM_CLIENT_EVENT_CMD_EOS_DONE, the
memory-mapped region appears to still be in use and fails to map again.

I believe this race was observed since commit 81c53b52de21 ("ASoC: qcom:
qdsp6: q6asm-dai: set 10 ms period and buffer alignment."), but would
need to verify. On sdm670, we are coping downstream by keeping the state
as Q6ASM_STREAM_RUNNING until receiving CMD_EOS_DONE.

Can the ADSP emit DATA_WRITE_DONE or DATA_READ_DONE before CMD_EOS_DONE?
We might need an extra stopping state between CMD_EOS and CMD_EOS_DONE
so the driver doesn't request more data transfers.

             reply	other threads:[~2026-05-01 14:40 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-05-01 14:41 Richard Acayan [this message]
2026-05-01 15:27 ` ASoC q6asm race condition when stopping and preparing the stream Alexey Klimov
2026-05-01 23:53   ` Richard Acayan

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