From nobody Sun Oct 5 12:47:01 2025 Received: from mail-lj1-f202.google.com (mail-lj1-f202.google.com [209.85.208.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4B294221D9E for ; Mon, 4 Aug 2025 08:08:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.208.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754294899; cv=none; b=ap8Y4OiTeBhlvU0ce9sZE4loMkRIzBqSsQ6Xmrj0FumsVAL49lGp/PoK9WU4DX+irjGvOVr7c2re1/I5HxzGmqFjtUvdQC5Lo5uT7+TnoK7DlaHDkkI0b+qlymbzhRkqY5SOmXRMaXY2OPb59+1a8TG2rAX3QkuZ8Q7BYwqXTgA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754294899; c=relaxed/simple; bh=gcEc+FpO3LIYPbjLO7I3aUUbBabMwLEp5GRofBB8rac=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=bopbfTO5oRbgI3QvQHHW85kY1BVGMVc21vbq3Ia6gojgZLwgepOJUKkRXchbGvgVAV2teby09R667QtxFRjZ1sURhmS2qDzfXBFd4E0dW43NuPVaHQnNDHPADiwV5D04zkkJZZMIOdcrrnT9WGMgdCztR7mCrSlJ6c1vtUuOqLA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--khtsai.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=egdOofYm; arc=none smtp.client-ip=209.85.208.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--khtsai.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="egdOofYm" Received: by mail-lj1-f202.google.com with SMTP id 38308e7fff4ca-332318413c4so15186371fa.3 for ; Mon, 04 Aug 2025 01:08:17 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1754294895; x=1754899695; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=zDpfVHh/I73JR0rh9yUDkpVjkFVk9LI6bMI7NvadtUA=; b=egdOofYmIxkeAMBy68PPJuHrG8NUOu0Wtp4GZj9sb7Qpm5wLRyrPrz+xslMieE1SpX Hn6LLelsYDLuX7OJx96tHX765e0pd4DOlEPYFJKx2wyogkPB2hwdR06k2azyrIyAc2jG Pksc/sSHskoidp6a3j2Cp4t4qFYfMzjxtawcTJU0oxW/VVNCT2ca559CXtZ8HcgfMiq5 CyPZ4tiBtz/TZ6/6sSfCuE7MXmibymOKRscu5gCHA/VqXYUSyw7/vSTz8xfvFM6pyMi5 9lxHU92SMJLv4IhiCRFTDralzi+uomhOsPcjAvS+54NeDuze5oxqLkrAJXfXzf2l1e0a iHsg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754294895; x=1754899695; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=zDpfVHh/I73JR0rh9yUDkpVjkFVk9LI6bMI7NvadtUA=; b=Qjf+GvIMv9ZUovecSl4B02HXdhMMUhHn6LvgpcNp7R1EPz2KG5DTir7PljctOU8Pu9 9+DiKvA5m4Epib1VYQv2UmFneRnxaywsBjeKOXm61MxTSJp8E0nuLl/yesGQRHewuHPC U8qoBseURfD1FsdYDzk0nFXCceZ0n/Ig16Q7X0Z/j/FzTZZq61nI33nfqTB2PPQcx67N d2LXyh4TvD4J9yuAlcg/HzzWApEcWhtUQdYOY3GQMlfm2pnC7iuFn6DLEPmShiErKe0i oI/6wkII4R57Gexs/ydPmBNXxcEyDWbxgeuaHdE3kNe4q0pCSrKiMqkLUcD2JxECV/DM DC5A== X-Forwarded-Encrypted: i=1; AJvYcCX3T9Gkj42KTqM7DwRVgTWhqGZ2WFjbudkUWs5XLzfEfQLWOP9v69I54OQCSuBgfrfCRV1rIu+SGPmXTqQ=@vger.kernel.org X-Gm-Message-State: AOJu0Yx75gquEOwfc+ytUpeI90Owbxafp6UnegYXVD+L7W3ZgWttZN4i IOFMKP5ZW4gPy9oidO7i2CJNRQDlajVHiplevXhl+Dp5r0RuuD/VU9C/6XhLLIMXwCK/kG4OYOI qHbNmhg== X-Google-Smtp-Source: AGHT+IFI/+C03ECI+u2R1ZspoDxfTwxjzHt8Ag3z9DMpMi6xjyg97vO8zI4z85XpJM8zbEHAQDDflyTWYjk= X-Received: from ljbbj30.prod.google.com ([2002:a2e:aa9e:0:b0:32b:8259:7b2]) (user=khtsai job=prod-delivery.src-stubby-dispatcher) by 2002:a05:651c:2126:b0:32a:8764:ecf1 with SMTP id 38308e7fff4ca-332566a4766mr15538621fa.4.1754294895320; Mon, 04 Aug 2025 01:08:15 -0700 (PDT) Date: Mon, 4 Aug 2025 16:08:05 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.50.1.565.gc32cd1483b-goog Message-ID: <20250804080809.1700691-1-khtsai@google.com> Subject: [RFC PATCH] usb: dwc3: Ignore late xferNotReady event to prevent halt timeout From: Kuen-Han Tsai To: Thinh.Nguyen@synopsys.com, gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Kuen-Han Tsai Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" During a device-initiated disconnect, an xferNotReady event for an ISOC IN endpoint can be received after the End Transfer command has already completed. This late event incorrectly triggers a new Start Transfer, which prevents the controller from halting and results in a DSTS.DEVCTRLHLT bit polling timeout. Ignore the late xferNotReady event if the controller is already in a disconnected state. Signed-off-by: Kuen-Han Tsai --- Tracing: # Stop active transfers by sending End Transfer commands android.hardwar-913 [004] d..1. 6172.855517: dwc3_gadget_ep_cmd: ep1o= ut: cmd 'End Transfer' [20d08] params 00000000 00000000 00000000 --> status= : Successful android.hardwar-913 [004] dn.1. 6172.855734: dwc3_gadget_ep_cmd: ep1i= n: cmd 'End Transfer' [40d08] params 00000000 00000000 00000000 --> status:= Successful ... # Recieve an xferNotReady event on an ISOC IN endpoint irq/991-dwc3-29741 [000] D..1. 6172.856166: dwc3_event: event (35d01= 0c6): ep1in: Transfer Not Ready [000035d0] (Not Active) irq/991-dwc3-29741 [000] D..1. 6172.856190: dwc3_gadget_ep_cmd: ep1i= n: cmd 'Start Transfer' [35d60406] params 00000000 ffffb620 00000000 --> st= atus: Successful android.hardwar-913 [004] dn.1. 6172.868130: dwc3_gadget_ep_cmd: ep2i= n: cmd 'End Transfer' [30d08] params 00000000 00000000 00000000 --> status:= Timed Out ... # Start polling DSTS.DEVCTRLHLT android.hardwar-913 [000] ..... 6172.869253: dwc3_gadget_run_stop: st= art polling DWC3_DSTS_DEVCTRLHLT ... # HALT timeout and show the endpoint status for debugging android.hardwar-913 [004] ..... 6177.479946: dwc3_gadget_run_stop: fi= nish polling DWC3_DSTS_DEVCTRLHLT, is_on=3D0, reg=3D0 android.hardwar-913 [004] ..... 6177.479957: dwc3_gadget_ep_status: e= p1out: mps 1024/2765 streams 16 burst 5 ring 64/56 flags E:swbp:> android.hardwar-913 [004] ..... 6177.479958: dwc3_gadget_ep_status: e= p1in: mps 1024/1024 streams 16 burst 2 ring 21/64 flags E:swBp:< android.hardwar-913 [004] ..... 6177.479959: dwc3_gadget_ep_status: e= p2out: mps 1024/2765 streams 16 burst 5 ring 56/48 flags e:swbp:> --- drivers/usb/dwc3/gadget.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 25db36c63951..506391699a10 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -3896,7 +3896,8 @@ static void dwc3_endpoint_interrupt(struct dwc3 *dwc, dwc3_gadget_endpoint_transfer_in_progress(dep, event); break; case DWC3_DEPEVT_XFERNOTREADY: - dwc3_gadget_endpoint_transfer_not_ready(dep, event); + if (dwc->connected) + dwc3_gadget_endpoint_transfer_not_ready(dep, event); break; case DWC3_DEPEVT_EPCMDCMPLT: dwc3_gadget_endpoint_command_complete(dep, event); -- 2.50.1.565.gc32cd1483b-goog