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Wed, 28 Oct 2026 02:42:34 -0700 (PDT) Received: from localhost.localdomain ([183.96.175.225]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3ae5a93b3f5sm2242377a91.5.2026.10.28.02.42.31 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Wed, 28 Oct 2026 02:42:34 -0700 (PDT) From: Joonho Lee To: linux-sound@vger.kernel.org Cc: tiwai@suse.de, perex@perex.cz, anton.yakovlev@opensynergy.com, mst@redhat.com, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, corbet@lwn.net, skhan@linuxfoundation.org, rdunlap@infradead.org, linux-doc@vger.kernel.org, Joonho Lee Subject: [PATCH v7 15/16] ALSA: pcm: synchronize stopped paused streams Date: Wed, 28 Oct 2026 18:41:31 +0900 Message-ID: <20261028094132.20364-16-mynameisjune111@gmail.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20261028094132.20364-1-mynameisjune111@gmail.com> References: <20261028094132.20364-1-mynameisjune111@gmail.com> X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit A paused stream can still own DMA requests even though snd_pcm_running() returns false. Stopping that stream without marking stop_operating lets a subsequent prepare skip sync_stop and encounter outstanding requests. Mark a paused stream for synchronous stop when snd_pcm_do_stop() handles its actual stop transition. This also covers paused XRUN cleanup without having the driver predict a stop from an intermediate ACK position. The non-staged virtio-snd partial-read test previously failed its first prepare with -EBADFD. With the companion driver changes it prepares and captures 48000 frames. Playback pause/drop/prepare/write and reopen tests also pass under ARM64 QEMU with KASAN and lockdep. This changes the core stop path for paused PCM streams beyond virtio-snd. Coverage does not extend to all PCM drivers. Assisted-by: LLM Signed-off-by: Joonho Lee --- diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c index a2ea44c..ac2e5c2 100644 --- a/sound/core/pcm_native.c +++ b/sound/core/pcm_native.c @@ -1611,6 +1611,9 @@ static int snd_pcm_do_stop(struct snd_pcm_substream *substream, substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); substream->runtime->stop_operating = true; } + /* Paused DMA can still own requests which sync_stop must drain. */ + if (substream->runtime->state == SNDRV_PCM_STATE_PAUSED) + substream->runtime->stop_operating = true; return 0; /* unconditionally stop all substreams */ }