From patchwork Tue Oct 15 21:29:15 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 836624 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 0614E20E028; Tue, 15 Oct 2024 21:30:07 +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=1729027810; cv=none; b=NUNKSpI5nhvXhWsE8a8FSgoHjQgJmL0qcKg10mblUp/6lFrPK6+7PGD+fd5/HYX4QHKY6QWMGMiAbXCGEDW97VxXPwMdXRaJgGZAsLGL8kSZOnc7BMSCYYiOVxlTVgM3ufIOMmnIz/9y+QjN5hyWlEuQsT7NfVo2f7kpjcOzGUc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729027810; c=relaxed/simple; bh=qU0dUNxFUuN/ND2hfWc0/b53f/OYr4+0HIcF9EoyLxI=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=IsVM7bkl7ZB5zRj8jqy6gO/5jfXmrdAnA/x6UN7P56HCyqJWABKD6HBHQZADpfnKhAQRptqoM/flbjV3IHDzNgesc7COVQLrO8uPIQN4YYSxJ4AZvJtJn/+nWXuC2XC1w1InZu+4MhQm4LpkygdeANeis8u+3/wlukiVhetGu7U= 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=f2tMuNF4; 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="f2tMuNF4" Received: from pps.filterd (m0279872.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 49FG0st4022433; Tue, 15 Oct 2024 21:29:37 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=qcppdkim1; bh= M4IGsOidRHFIubeJL9OdlEYfFZx1GNBQBMy1HdndUaw=; b=f2tMuNF42vXkVMdF desTF0/M6ewcPC08DKVUMdLdOpI9Pfi2vhqn9iVID91xpooBq/RTtAzC+W42Sa0L MslWurW3IL/6hxWOVQs5pPYjgONYWYyRd85o8JuCzMznieQdG7MX+BzQm5ELj31m wTDfNwayHnyr4TnoaC0ZgcKzYmb1RWG/rL5ITRmJCVrHlM2zJ7XAuScRF3q39mr2 tq82JxxRoGGBY6+g6TASJWfwFIcOWhqTxArnfVvocXykr1yYf4zfctHXb43asgda XcDSl7h/e53ecQbKYCSVYyanhxoL+S8bWcBUe28kCubAE66V2kqAS7+ntBPcMP4n RySPXA== Received: from nalasppmta01.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 429jrfah4f-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 15 Oct 2024 21:29:37 +0000 (GMT) Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA01.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 49FLTagg022414 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 15 Oct 2024 21:29:36 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 15.2.1544.9; Tue, 15 Oct 2024 14:29:35 -0700 From: Wesley Cheng To: , , , , , , , , , , , , , , CC: , , , , , , , , Wesley Cheng Subject: [PATCH v29 33/33] ASoC: usb: Rediscover USB SND devices on USB port add Date: Tue, 15 Oct 2024 14:29:15 -0700 Message-ID: <20241015212915.1206789-34-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241015212915.1206789-1-quic_wcheng@quicinc.com> References: <20241015212915.1206789-1-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: nalasex01b.na.qualcomm.com (10.47.209.197) 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-GUID: JVvQOaJwyXwMJ44vtvzxisdPyv94LuQr X-Proofpoint-ORIG-GUID: JVvQOaJwyXwMJ44vtvzxisdPyv94LuQr X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxscore=0 spamscore=0 malwarescore=0 suspectscore=0 phishscore=0 impostorscore=0 clxscore=1015 mlxlogscore=999 priorityscore=1501 adultscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410150143 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 e56826f1df71..ee566ca7c675 100644 --- a/sound/soc/soc-usb.c +++ b/sound/soc/soc-usb.c @@ -279,6 +279,8 @@ 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);