From patchwork Thu Feb 8 23:14:04 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 771789 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9318554FAE; Thu, 8 Feb 2024 23:14:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.180.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707434091; cv=none; b=UjQ/4cigmoxALhEgphFDLbTcE4SsWeKp1HW7/jA+jleuWC3VCE4jl2JUSED/eFhrZu0vU8e+pUSCeTIalRkCeaThKyjDHdRJOT6kvo8CU24s2SgmMMdBbcIhMk5H2Ekh1UKOys1NOaJqKXDEEZTLfIRHgBtfDdxBwOYDWKKN2VI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707434091; c=relaxed/simple; bh=GgnICuH7GHv7SDlK6A+NlCN2HhLTGdZZc+5NwsH4lPE=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=jEfqeenfXpr+BDKKy1XKcawmAO0EqHn0iGOTKPkR9sKGYTTZTFP3geXtgkulutrMBJYROudA0p9T9yev9Y+cbPL/mg4T38Qu8l3eICd3U4lN6SldUMNTmra3wlRhKd31AChAJnjUUIEsBg6y1sk0eVN42JpZkjAxNIZo3mh/YJU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com; spf=pass smtp.mailfrom=quicinc.com; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b=mwfLJ32a; arc=none smtp.client-ip=205.220.180.131 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=quicinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=quicinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=quicinc.com header.i=@quicinc.com header.b="mwfLJ32a" Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.24/8.17.1.24) with ESMTP id 418Mm7mG001429; Thu, 8 Feb 2024 23:14:31 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-type; s=qcppdkim1; bh=1gKa8uPfE60yWjTTUplQ LsTc6cS2VTs4IFAWikb6MkA=; b=mwfLJ32a4WxDD8ch1RYJpsy4UMZ4f+PZ9CA6 z8NvoUbW75E1ZuaJDoECFUrq5jjXTfm0HLbjGR0sVyczbOjdjlJdPMpK9mwjRFNG hOfbjn0wg17yYu//58hJTj9btCimJClWaA7yZlWdiiyMwBxrXM0sgniN/yKfN2wu k8yUcQMgdYMYwKMs2MrJLF+WoKmhuhNQrnW0KWDdur+6qhpeEwsGKWml3T+h6PZj rbKANA8cD/itgRdfdLzxdxAdZDE6ig6gCSauCq3cNTsDKxIVpiELsyO5ryS2Gyrz fKyuYO0bMtr/FSl2wceiAy5VtVhFsWu5b8aY3/jYzqzO+J2RtA== Received: from nalasppmta01.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3w4frwujuc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 08 Feb 2024 23:14:31 +0000 (GMT) Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 418NEUwB005652 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 8 Feb 2024 23:14:30 GMT Received: from hu-wcheng-lv.qualcomm.com (10.49.16.6) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Thu, 8 Feb 2024 15:14:29 -0800 From: Wesley Cheng To: , , , , , , , , , , , , , , CC: , , , , , , , Wesley Cheng Subject: [PATCH v14 51/53] ASoC: usb: Rediscover USB SND devices on USB port add Date: Thu, 8 Feb 2024 15:14:04 -0800 Message-ID: <20240208231406.27397-52-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240208231406.27397-1-quic_wcheng@quicinc.com> References: <20240208231406.27397-1-quic_wcheng@quicinc.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nalasex01c.na.qualcomm.com (10.47.97.35) To nalasex01b.na.qualcomm.com (10.47.209.197) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: L9tl1Hi6qOSqUvYvy-6cEpxSLUX6F09w X-Proofpoint-GUID: L9tl1Hi6qOSqUvYvy-6cEpxSLUX6F09w X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-02-08_11,2024-02-08_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 spamscore=0 suspectscore=0 bulkscore=0 phishscore=0 clxscore=1015 lowpriorityscore=0 mlxlogscore=999 adultscore=0 priorityscore=1501 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2401310000 definitions=main-2402080131 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 --- 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 dfd6f53898c5..4d6d6ab0601f 100644 --- a/sound/soc/soc-usb.c +++ b/sound/soc/soc-usb.c @@ -437,6 +437,8 @@ int snd_soc_usb_add_port(struct snd_soc_usb *usb) list_add_tail(&usb->list, &usb_ctx_list); mutex_unlock(&ctx_mutex); + snd_usb_rediscover_devices(); + return 0; } EXPORT_SYMBOL_GPL(snd_soc_usb_add_port);