Re: [PATCH v21 22/39] ALSA: usb-audio: Prevent starting of audio stream if in use

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To: Wesley Cheng <quic_wcheng@xxxxxxxxxxx>, srinivas.kandagatla@xxxxxxxxxx, mathias.nyman@xxxxxxxxx, perex@xxxxxxxx, conor+dt@xxxxxxxxxx, corbet@xxxxxxx, lgirdwood@xxxxxxxxx, andersson@xxxxxxxxxx, krzk+dt@xxxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, Thinh.Nguyen@xxxxxxxxxxxx, broonie@xxxxxxxxxx, bgoswami@xxxxxxxxxxx, tiwai@xxxxxxxx, bagasdotme@xxxxxxxxx, robh@xxxxxxxxxx, konrad.dybcio@xxxxxxxxxx
Subject: Re: [PATCH v21 22/39] ALSA: usb-audio: Prevent starting of audio stream if in use
From: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Date: Tue, 7 May 2024 16:20:26 -0500
Cc: linux-kernel@xxxxxxxxxxxxxxx, devicetree@xxxxxxxxxxxxxxx, linux-sound@xxxxxxxxxxxxxxx, linux-usb@xxxxxxxxxxxxxxx, linux-arm-msm@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, alsa-devel@xxxxxxxxxxxxxxxx
In-reply-to: <20240507195116.9464-23-quic_wcheng@quicinc.com>
References: <20240507195116.9464-1-quic_wcheng@quicinc.com> <20240507195116.9464-23-quic_wcheng@quicinc.com>
User-agent: Mozilla Thunderbird

> If a PCM device is already in use, the check will return an error to
> userspace notifying that the stream is currently busy.  This ensures that
> only one path is using the USB substream.

What was the point of having a "USB Mixer" then?

Follow-Ups:
- Re: [PATCH v21 22/39] ALSA: usb-audio: Prevent starting of audio stream if in use
  - From: Wesley Cheng

References:
- [PATCH v21 00/39] Introduce QC USB SND audio offloading support
  - From: Wesley Cheng
- [PATCH v21 22/39] ALSA: usb-audio: Prevent starting of audio stream if in use
  - From: Wesley Cheng

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