From patchwork Tue Feb 13 00:54:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 772628 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) (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 BBE6659146; Tue, 13 Feb 2024 00:55:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=205.220.168.131 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707785710; cv=none; b=gxM6mRccGES/Z6O/kfTVPeU7E81+1jR+2sD/K7MQsKMW5q9VZuAM2uUdeVKiaoV5IPqIBp6gGXa47swuL0pvtHHvoFKIMgqhgPobR443OGUxwj/HipLPdE/XFpvAawiD9mYzYZCceQteaEeAw/9CLRHeW/y+zCRYxB20US74N/Q= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707785710; c=relaxed/simple; bh=/+jd5JtmoaoHN1pQ/vwGQl4AkYq7xNMktaBcFDR5q+c=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=gqWuaB/T1b3MTSTL1sDCS6JhdXDW3Qc4cIZmvLF6LZR66QZEa6fZaD5f56e7MVkEGjJPhHCY6zb6fB9WaMee/u9VQNmI5m3R0bYrAfb0zSzOrheww2BupLpvz4o3GSm97hiVP4UuPHJZM3BN1DbOApIa3+AdyCNHFzd5tSjXevQ= 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=jxhjsdVQ; arc=none smtp.client-ip=205.220.168.131 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="jxhjsdVQ" Received: from pps.filterd (m0279865.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.24/8.17.1.24) with ESMTP id 41D01pft000380; Tue, 13 Feb 2024 00:54:47 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=D0DqocdeBiZmMp9owFwj I2QOH5t43SdG1GCqpHEtKK0=; b=jxhjsdVQLU+VOTkWE5QXeZQh4xeIuw66stnT zEnH6GL4lGNYY0QGbEpjkbv+GY/t3WiUmeIn6vzxtQ8CUB7PWNaPURh2GzonNDnO CurNJ4+n8mDHGZIA2vXgsRg4W+eygvLElCRKj7WEYnukioMswygcF11HBuyQRy34 7KWpkFYiKS8M76Xqmg1G+cFYjfRJqHMmKcZv3IES7DuLWmumLPhSmaQ0/VasH2q6 c2vLJyqw6ifwESFfM8Jb4x4cEG7ysm5xg4vTODgJLSTQDhJYpCzS/PYn9SBqrqeT 7nL4wvpFfAUJfet+NRP46Zj8ihTE8rRkGqOegSupNKA8fYMIiw== Received: from nalasppmta03.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3w7hew9rvu-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 13 Feb 2024 00:54:46 +0000 (GMT) Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA03.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 41D0skn9031603 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 13 Feb 2024 00:54:46 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; Mon, 12 Feb 2024 16:54:45 -0800 From: Wesley Cheng To: , , , , , , , , , , , , , , CC: , , , , , , , Wesley Cheng Subject: [PATCH v15 48/50] ASoC: usb: Rediscover USB SND devices on USB port add Date: Mon, 12 Feb 2024 16:54:20 -0800 Message-ID: <20240213005422.3121-49-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240213005422.3121-1-quic_wcheng@quicinc.com> References: <20240213005422.3121-1-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: TzIovpDfc2ez2ZcdCLOJkzTGYEwrQn5C X-Proofpoint-ORIG-GUID: TzIovpDfc2ez2ZcdCLOJkzTGYEwrQn5C 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=2024-02-12_20,2024-02-12_03,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 phishscore=0 adultscore=0 bulkscore=0 clxscore=1015 mlxlogscore=999 priorityscore=1501 malwarescore=0 suspectscore=0 mlxscore=0 lowpriorityscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2401310000 definitions=main-2402130005 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 9de5b9ed0cea..44d6057ffb17 100644 --- a/sound/soc/soc-usb.c +++ b/sound/soc/soc-usb.c @@ -436,6 +436,8 @@ 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);