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no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Mon, 23 Oct 2023 17:06:57 +0200, Matias Ezequiel Vara Larsen wrote: > > +static int virtsnd_pcm_ack(struct snd_pcm_substream *substream) > +{ > + struct virtio_pcm_substream *vss = snd_pcm_substream_chip(substream); > + struct virtio_snd_queue *queue = virtsnd_pcm_queue(vss); > + unsigned long flags; > + struct snd_pcm_runtime *runtime = vss->substream->runtime; > + ssize_t appl_pos = frames_to_bytes(runtime, runtime->control->appl_ptr); > + ssize_t buf_size = frames_to_bytes(runtime, runtime->buffer_size); > + int rc; > + > + spin_lock_irqsave(&queue->lock, flags); > + spin_lock(&vss->lock); > + > + ssize_t bytes = (appl_pos - vss->appl_ptr) % buf_size; The variable declaration should be moved to the beginning of the function. Also, there can be a overlap beyond runtime->boundary (which easily happens for 32bit apps), so the calculation can be a bit more complex with conditional. thanks, Takashi