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[v36,18/31] ASoC: usb: Rediscover USB SND devices on USB port add

Message ID 20250319005141.312805-19-quic_wcheng@quicinc.com
State New
Headers show
Series [v36,01/31] xhci: sideband: add initial api to register a secondary interrupter entity | expand

Commit Message

Wesley Cheng March 19, 2025, 12:51 a.m. UTC 
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.

The chip array entries are all populated and removed while under the
register_mutex, so going over potential race conditions:

Thread#1:
  q6usb_component_probe()
    --> snd_soc_usb_add_port()
      --> snd_usb_rediscover_devices()
        --> mutex_lock(register_mutex)

Thread#2
  --> usb_audio_disconnect()
    --> mutex_lock(register_mutex)

So either thread#1 or thread#2 will complete first.  If

Thread#1 completes before thread#2:
  SOC USB will notify DPCM backend of the device connection.  Shortly
  after, once thread#2 runs, we will get a disconnect event for the
  connected device.

Thread#2 completes before thread#1:
  Then during snd_usb_rediscover_devices() it won't notify of any
  connection for that particular chip index.

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

Patch

diff --git a/sound/soc/soc-usb.c b/sound/soc/soc-usb.c
index 406bc4a1015d..26baa66d29a8 100644
--- a/sound/soc/soc-usb.c
+++ b/sound/soc/soc-usb.c
@@ -228,6 +228,8 @@  void snd_soc_usb_add_port(struct snd_soc_usb *usb)
 	mutex_lock(&ctx_mutex);
 	list_add_tail(&usb->list, &usb_ctx_list);
 	mutex_unlock(&ctx_mutex);
+
+	snd_usb_rediscover_devices();
 }
 EXPORT_SYMBOL_GPL(snd_soc_usb_add_port);