From patchwork Wed Oct 11 00:21:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wesley Cheng X-Patchwork-Id: 732012 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from alsa0.perex.cz (alsa0.perex.cz [77.48.224.243]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F0159CD98E0 for ; Wed, 11 Oct 2023 00:31:50 +0000 (UTC) Received: from alsa1.perex.cz (alsa1.perex.cz [207.180.221.201]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by alsa0.perex.cz (Postfix) with ESMTPS id E2DC2F14; Wed, 11 Oct 2023 02:30:58 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa0.perex.cz E2DC2F14 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=alsa-project.org; s=default; t=1696984308; bh=IutgeEUN06yogw9T047UCmKpsX29+Dgb/1RcO2Ej1Nc=; h=From:To:CC:Subject:Date:In-Reply-To:References:List-Id: List-Archive:List-Help:List-Owner:List-Post:List-Subscribe: List-Unsubscribe:From; b=IhclYn52RLLefZ5XmvYC1yQDFTf0hAKKtSv8CRJb5XZkMsOdNHxAnnhKumve1fIIL JyaGxbcedE0pVXIBaXt+3Tapkc6E/BQTrRpEMAq0dFne9cMaW6MG7Phh36u/j8bgjs +6UqMUKB05e3oj5ikrvOnDElAddTi5zlAzPBIyLQ= Received: by alsa1.perex.cz (Postfix, from userid 50401) id 6F3BEF806AB; Wed, 11 Oct 2023 02:24:48 +0200 (CEST) Received: from mailman-core.alsa-project.org (mailman-core.alsa-project.org [10.254.200.10]) by alsa1.perex.cz (Postfix) with ESMTP id 83216F806A7; Wed, 11 Oct 2023 02:24:47 +0200 (CEST) Received: by alsa1.perex.cz (Postfix, from userid 50401) id 7EBB8F805AE; Wed, 11 Oct 2023 02:24:35 +0200 (CEST) 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 alsa1.perex.cz (Postfix) with ESMTPS id 1EEA9F805A0 for ; Wed, 11 Oct 2023 02:22:43 +0200 (CEST) DKIM-Filter: OpenDKIM Filter v2.11.0 alsa1.perex.cz 1EEA9F805A0 Authentication-Results: alsa1.perex.cz; dkim=pass (2048-bit key, unprotected) header.d=quicinc.com header.i=@quicinc.com header.a=rsa-sha256 header.s=qcppdkim1 header.b=ffOWkcuy Received: from pps.filterd (m0279867.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 39B0McF7018070; Wed, 11 Oct 2023 00:22:41 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=DoJZgskjuTAjvQWKHDVwm5LpAAOTSIH3Fsab8vjZneA=; b=ffOWkcuyRhGA7Hbirr0BhmzzmuM92lWc36GgJHxHJUMRi9ltcpT7OmCY1PouWJoQ/qD9 LYz7WfI2B8+jvmhj/5Br0J+7ancO5anFep2S0jUC4XyVZgQiEHoaoq36/xKG/TUDBwU9 7S7dj03/j4tavJpyLLaHHgNCGq0df8bDLTe0CSeSX0DtYYvqPeEwU4jl2E54g3BM+lWB roNkbilY15uONZo4F2ZkGc7sDbP3GIUkhS+7gc8hqxAxaugJDhF9audLdS6Rs8XNBOat L71Y8p0JGbCFxJCF6aTbSxg0Q/4uSWmxP5RBmqOANhNBVisj7u86368r58vC8J3aXAPO ZQ== Received: from nalasppmta05.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3tne0q08m1-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 11 Oct 2023 00:22:41 +0000 Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA05.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 39B0MeaP027127 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 11 Oct 2023 00:22:40 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 15.2.1118.36; Tue, 10 Oct 2023 17:22:39 -0700 From: Wesley Cheng To: , , , , , , , , , , , , , , CC: , , , , , Wesley Cheng Subject: [PATCH v8 34/34] ASoC: usb: Rediscover USB SND devices on USB port add Date: Tue, 10 Oct 2023 17:21:46 -0700 Message-ID: <20231011002146.1821-35-quic_wcheng@quicinc.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20231011002146.1821-1-quic_wcheng@quicinc.com> References: <20231011002146.1821-1-quic_wcheng@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] 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: VaKnbIZdUT5nujuIAEDJWxsAF2z8WIEL X-Proofpoint-ORIG-GUID: VaKnbIZdUT5nujuIAEDJWxsAF2z8WIEL X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.267,Aquarius:18.0.980,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-10-10_19,2023-10-10_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 spamscore=0 mlxscore=0 clxscore=1015 priorityscore=1501 phishscore=0 adultscore=0 impostorscore=0 suspectscore=0 lowpriorityscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2309180000 definitions=main-2310110001 Message-ID-Hash: 42OMGS4BNVPBW3ZNPEFYO6JXT3TCMKJK X-Message-ID-Hash: 42OMGS4BNVPBW3ZNPEFYO6JXT3TCMKJK X-MailFrom: quic_wcheng@quicinc.com X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.8 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: 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 7407678a993e..60aafbe87c36 100644 --- a/sound/soc/soc-usb.c +++ b/sound/soc/soc-usb.c @@ -104,6 +104,8 @@ struct snd_soc_usb *snd_soc_usb_add_port(struct device *dev, void *priv, list_add_tail(&usb->list, &usb_ctx_list); mutex_unlock(&ctx_mutex); + snd_usb_rediscover_devices(); + return usb; } EXPORT_SYMBOL_GPL(snd_soc_usb_add_port);