linux-kernel - [PATCH v3 28/28] sound: soc: soc-usb: Rediscover USB SND devices on USB port add

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Date:   Wed, 8 Mar 2023 15:57:51 -0800
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     <srinivas.kandagatla@...aro.org>, <mathias.nyman@...el.com>,
        <perex@...ex.cz>, <broonie@...nel.org>, <lgirdwood@...il.com>,
        <krzysztof.kozlowski+dt@...aro.org>, <agross@...nel.org>,
        <Thinh.Nguyen@...opsys.com>, <bgoswami@...cinc.com>,
        <andersson@...nel.org>, <robh+dt@...nel.org>,
        <gregkh@...uxfoundation.org>, <tiwai@...e.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <quic_jackp@...cinc.com>,
        <quic_plai@...cinc.com>, Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [PATCH v3 28/28] sound: soc: soc-usb: Rediscover USB SND devices on USB port add

In case the USB backend device has not been initialized/probed, USB SND
device connections can still occur.  When the USB backend is eventually
made available, previous USB SND device connections are not communicated to
the USB backend.  Call snd_usb_rediscover_devices() to generate the connect
callbacks for all USB SND devices connected.  This will allow for the USB
backend to be updated with the current set of devices available.

Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
---
 sound/soc/soc-usb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/soc/soc-usb.c b/sound/soc/soc-usb.c
index 84dc6d0b2eab..a9413e3d18df 100644
--- a/sound/soc/soc-usb.c
+++ b/sound/soc/soc-usb.c
@@ -111,6 +111,8 @@ struct snd_soc_usb *snd_soc_usb_add_port(struct device *dev, void *priv,
 	list_add_tail(&usb->list, &usb_ctx_list);
 	mutex_unlock(&ctx_mutex);
 
+	snd_usb_rediscover_devices();
+
 	return usb;
 }
 EXPORT_SYMBOL_GPL(snd_soc_usb_add_port);