From 46deb15d12f360971c3b36fe84bf3e280812d9de Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Mon, 12 Sep 2022 16:34:25 +0200
Subject: [PATCH] ALSA: request device to query its settings

Querying available buffersizes and sample-rates requires access
to the device. Almost all ALSA devices are limited to
a single user-space application so we unconditionally try
to request access to the device.
---
 libs/backends/alsa/alsa_audiobackend.cc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libs/backends/alsa/alsa_audiobackend.cc b/libs/backends/alsa/alsa_audiobackend.cc
index 82c8a95a36..cbc5739697 100644
--- a/libs/backends/alsa/alsa_audiobackend.cc
+++ b/libs/backends/alsa/alsa_audiobackend.cc
@@ -346,8 +346,10 @@ AlsaAudioBackend::set_input_device_name (const std::string& d)
 		_input_audio_device_info.valid = false;
 		return 1;
 	}
+	_device_reservation.acquire_device (alsa_device.c_str ());
 	/* device will be busy once used, hence cache the parameters */
 	/* return */ get_alsa_device_parameters (alsa_device.c_str (), false, &_input_audio_device_info);
+	_device_reservation.release_device ();
 	return 0;
 }