From patchwork Mon Jun 10 23:58:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 803635 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 75F0015251C; Mon, 10 Jun 2024 23:58:42 +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=1718063924; cv=none; b=eR+KQQFeACtPh6UqLL0ZUYOElPNvix38DfDTeXpIBmeBKeS/mL1kye1JnkWU8E4n5U03rvkuaNyd+WVtDbpJJDqi66omgvd7sNRvfKfWfIuR96yObGQC2XNJ7I4IxifYqcjJakUZEKhkB0pT420Vaj2g/ciCbIyHBjnFk2inLCs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718063924; c=relaxed/simple; bh=JRrJ8Fm5hI+qm0drOuDhVg0hMJuUZP9PozV/Xog8KLE=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=Cy1r8jVOymrXzDaoTsizKpZcPkdHsFLcDGwni71+6hzbGvkp7/ToFQkOEa+XYKRUxabp8FovtT2l/ImmDiK3yIC9IXPX0BTxqvlBO2nW3iK+YSh1XUyfpM99EzUE/ZdFvBNSvj3pJarrF6SE3rLjLnBwvcmxuIUIhAbgOKU5/OI= 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=LcdyzLn1; 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="LcdyzLn1" Received: from pps.filterd (m0279873.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 45AEdrs2003997; Mon, 10 Jun 2024 23:58:29 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-type:date:from:in-reply-to:message-id:mime-version :references:subject:to; s=qcppdkim1; bh=C3TLaE8m/WOgCptyuUdKmiIh 2Vajd8/Ri4meOdX1tsM=; b=LcdyzLn1NGUzYKVS2OxnQpw9Pwi0pB2uImt590yc UWo+YXWH8HO+9jyK0IIfxzGOc1tH5dbYwT+wHJCLogwpr/qekpPzS+dcnsk7rHCu Dr/8hBDggIMsp31YLDj4XFZ1YJOHh+oQA4sq5PmHtFyuHIew8XnTUQUbtjMKfyur vE0SuVae/We+KV6wbkWSIHPOHJVRLZ/ZdX4Omn8RMsvxAr04wdvpOEKlJjlFkLFR OUmqyn14XeZtvv+tjXjeegfmhyktwys0p3lYSl/pTcLrB/MX3ojbkL+zCnD291uf OiDIUvJNVyzsAWDJeJR6jK3R++sHYWOfgZZJWdX72r+4iA== Received: from nalasppmta03.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3ymcnmvtyc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 10 Jun 2024 23:58:29 +0000 (GMT) Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA03.qualcomm.com (8.17.1.19/8.17.1.19) with ESMTPS id 45ANwRXZ023798 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 10 Jun 2024 23:58:27 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; Mon, 10 Jun 2024 16:58:27 -0700 From: Wesley Cheng To: , , , , , , , , , , , , CC: , , , , , , , Wesley Cheng Subject: [PATCH v23 31/32] ASoC: usb: Rediscover USB SND devices on USB port add Date: Mon, 10 Jun 2024 16:58:07 -0700 Message-ID: <20240610235808.22173-32-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240610235808.22173-1-quic_wcheng@quicinc.com> References: <20240610235808.22173-1-quic_wcheng@quicinc.com> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: nalasex01a.na.qualcomm.com (10.47.209.196) 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: dX4ypyWcxcAEaJ9-CkTCuQ-ZTczoQXui X-Proofpoint-ORIG-GUID: dX4ypyWcxcAEaJ9-CkTCuQ-ZTczoQXui X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-10_07,2024-06-10_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 impostorscore=0 clxscore=1015 adultscore=0 phishscore=0 spamscore=0 priorityscore=1501 malwarescore=0 mlxscore=0 mlxlogscore=999 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2405170001 definitions=main-2406100176 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 d50bcb9f379e..e708eaf05a95 100644 --- a/sound/soc/soc-usb.c +++ b/sound/soc/soc-usb.c @@ -593,6 +593,8 @@ 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);