From nobody Sun Oct 5 07:24:31 2025 Received: from mailout3.samsung.com (mailout3.samsung.com [203.254.224.33]) (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 A4E0821C9E1 for ; Thu, 7 Aug 2025 01:49:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=203.254.224.33 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754531359; cv=none; b=I0UKVK9jCS1jzM0ti23Wy277fnmhBHeTVoyqxzIRbfFpAAWcGVsGFAHHiA+cP7Hz1RwFmTSvZ3xJkgaD57fQYc8sPWWFdoVtCyGkH98I2dEdjJiL19AT/uCTNZDObF6x5wd8n2fIeXAXyYRxqKnsn0WpSuHaOmB0c+ARM/S6ORE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754531359; c=relaxed/simple; bh=4rTy0UJO46zhrjp/3D4QKbtDA/HYjF6KdGsxVdcDidI=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type: References; b=WOOgUBEebO1gDbDafAgcrjlxlunwTP/agHRpyjn6mRrMOxVLZT3/+jItLyrBC5Ie2lAargB/sUoCiKJE/ofPjH+hkPM29VqNwgDIp4LppeIr3+76gLtWys2LCFqcQ0X6aHj1iQ7saituwvvVVh1n7Gh+APSeT1oTKkI9j6ll8pE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com; spf=pass smtp.mailfrom=samsung.com; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b=uSrNOqUw; arc=none smtp.client-ip=203.254.224.33 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=samsung.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=samsung.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=samsung.com header.i=@samsung.com header.b="uSrNOqUw" Received: from epcas5p3.samsung.com (unknown [182.195.41.41]) by mailout3.samsung.com (KnoxPortal) with ESMTP id 20250807014908epoutp03f6da5d9ac1cd63f28280744ad82711c6~ZWPcYKYVR2775127751epoutp03q for ; Thu, 7 Aug 2025 01:49:08 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 mailout3.samsung.com 20250807014908epoutp03f6da5d9ac1cd63f28280744ad82711c6~ZWPcYKYVR2775127751epoutp03q DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=samsung.com; s=mail20170921; t=1754531348; bh=Yx6Ha9csxeO3tsmXfIubwgSSi28+8MBUa2R8DPZoFrQ=; h=From:To:Cc:Subject:Date:References:From; b=uSrNOqUwylIC83DD+nSnekltSFtgKv1zXK68xPm+zartoxJOo7rpAa02I2l7E/sOt OZURiG/8UtKjqKPaG+BYe8xLXUH6pE63AVymkUipRrn7e3lYIWmIaIaf2wpfQRSqw2 e/zj3E6OaGNkLITj4Akw0ZImEswtekLHEgQ6uvIU= Received: from epsnrtp04.localdomain (unknown [182.195.42.156]) by epcas5p3.samsung.com (KnoxPortal) with ESMTPS id 20250807014907epcas5p3d2a41737f237cf2e2db92f97e6a7143c~ZWPb1P92S2771527715epcas5p3_; Thu, 7 Aug 2025 01:49:07 +0000 (GMT) Received: from epcas5p1.samsung.com (unknown [182.195.38.92]) by epsnrtp04.localdomain (Postfix) with ESMTP id 4by97Q3CpGz6B9mK; Thu, 7 Aug 2025 01:49:06 +0000 (GMT) Received: from epsmtip1.samsung.com (unknown [182.195.34.30]) by epcas5p1.samsung.com (KnoxPortal) with ESMTPA id 20250807014905epcas5p13f7d4ae515619e1e4d7a998ab2096c32~ZWPaQszKv1112611126epcas5p1V; Thu, 7 Aug 2025 01:49:05 +0000 (GMT) Received: from INBRO002811.samsungds.net (unknown [107.122.5.126]) by epsmtip1.samsung.com (KnoxPortal) with ESMTPA id 20250807014903epsmtip1c3bf3eed79acbfb479facee5253e35b2~ZWPX7eQXN2901529015epsmtip1d; Thu, 7 Aug 2025 01:49:03 +0000 (GMT) From: Selvarasu Ganesan To: Thinh.Nguyen@synopsys.com, gregkh@linuxfoundation.org, m.grzeschik@pengutronix.de, balbi@ti.com, bigeasy@linutronix.de, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Cc: jh0801.jung@samsung.com, dh10.jung@samsung.com, akash.m5@samsung.com, hongpooh.kim@samsung.com, eomji.oh@samsung.com, shijie.cai@samsung.com, alim.akhtar@samsung.com, muhammed.ali@samsung.com, thiagu.r@samsung.com, Selvarasu Ganesan , stable@vger.kernel.org Subject: [PATCH v2] usb: dwc3: Remove WARN_ON for device endpoint command timeouts Date: Thu, 7 Aug 2025 07:16:31 +0530 Message-ID: <20250807014639.1596-1-selvarasu.g@samsung.com> X-Mailer: git-send-email 2.46.0.windows.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CMS-MailID: 20250807014905epcas5p13f7d4ae515619e1e4d7a998ab2096c32 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" CMS-TYPE: 105P cpgsPolicy: CPGSC10-542,Y X-CFilter-Loop: Reflected X-CMS-RootMailID: 20250807014905epcas5p13f7d4ae515619e1e4d7a998ab2096c32 References: This commit addresses a rarely observed endpoint command timeout which causes kernel panic due to warn when 'panic_on_warn' is enabled and unnecessary call trace prints when 'panic_on_warn' is disabled. It is seen during fast software-controlled connect/disconnect testcases. The following is one such endpoint command timeout that we observed: 1. Connect =3D=3D=3D=3D=3D=3D=3D ->dwc3_thread_interrupt ->dwc3_ep0_interrupt ->configfs_composite_setup ->composite_setup ->usb_ep_queue ->dwc3_gadget_ep0_queue ->__dwc3_gadget_ep0_queue ->__dwc3_ep0_do_control_data ->dwc3_send_gadget_ep_cmd 2. Disconnect =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D ->dwc3_thread_interrupt ->dwc3_gadget_disconnect_interrupt ->dwc3_ep0_reset_state ->dwc3_ep0_end_control_data ->dwc3_send_gadget_ep_cmd In the issue scenario, in Exynos platforms, we observed that control transfers for the previous connect have not yet been completed and end transfer command sent as a part of the disconnect sequence and processing of USB_ENDPOINT_HALT feature request from the host timeout. This maybe an expected scenario since the controller is processing EP commands sent as a part of the previous connect. It maybe better to remove WARN_ON in all places where device endpoint commands are sent to avoid unnecessary kernel panic due to warn. Cc: stable@vger.kernel.org Signed-off-by: Akash M Signed-off-by: Selvarasu Ganesan Acked-by: Thinh Nguyen --- Changes in v2: - Removed the 'Fixes' tag from the commit message, as this patch does not contain a fix. - And Retained the 'stable' tag, as these changes are intended to be applied across all stable kernels. - Additionally, replaced 'dev_warn*' with 'dev_err*'." Link to v1: https://lore.kernel.org/all/20250807005638.thhsgjn73aaov2af@syn= opsys.com/ --- drivers/usb/dwc3/ep0.c | 20 ++++++++++++++++---- drivers/usb/dwc3/gadget.c | 10 ++++++++-- 2 files changed, 24 insertions(+), 6 deletions(-) diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c index 666ac432f52d..b4229aa13f37 100644 --- a/drivers/usb/dwc3/ep0.c +++ b/drivers/usb/dwc3/ep0.c @@ -288,7 +288,9 @@ void dwc3_ep0_out_start(struct dwc3 *dwc) dwc3_ep0_prepare_one_trb(dep, dwc->ep0_trb_addr, 8, DWC3_TRBCTL_CONTROL_SETUP, false); ret =3D dwc3_ep0_start_trans(dep); - WARN_ON(ret < 0); + if (ret < 0) + dev_err(dwc->dev, "ep0 out start transfer failed: %d\n", ret); + for (i =3D 2; i < DWC3_ENDPOINTS_NUM; i++) { struct dwc3_ep *dwc3_ep; =20 @@ -1061,7 +1063,9 @@ static void __dwc3_ep0_do_control_data(struct dwc3 *d= wc, ret =3D dwc3_ep0_start_trans(dep); } =20 - WARN_ON(ret < 0); + if (ret < 0) + dev_err(dwc->dev, + "ep0 data phase start transfer failed: %d\n", ret); } =20 static int dwc3_ep0_start_control_status(struct dwc3_ep *dep) @@ -1078,7 +1082,12 @@ static int dwc3_ep0_start_control_status(struct dwc3= _ep *dep) =20 static void __dwc3_ep0_do_control_status(struct dwc3 *dwc, struct dwc3_ep = *dep) { - WARN_ON(dwc3_ep0_start_control_status(dep)); + int ret; + + ret =3D dwc3_ep0_start_control_status(dep); + if (ret) + dev_err(dwc->dev, + "ep0 status phase start transfer failed: %d\n", ret); } =20 static void dwc3_ep0_do_control_status(struct dwc3 *dwc, @@ -1121,7 +1130,10 @@ void dwc3_ep0_end_control_data(struct dwc3 *dwc, str= uct dwc3_ep *dep) cmd |=3D DWC3_DEPCMD_PARAM(dep->resource_index); memset(¶ms, 0, sizeof(params)); ret =3D dwc3_send_gadget_ep_cmd(dep, cmd, ¶ms); - WARN_ON_ONCE(ret); + if (ret) + dev_err_ratelimited(dwc->dev, + "ep0 data phase end transfer failed: %d\n", ret); + dep->resource_index =3D 0; } =20 diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 4a3e97e606d1..4a3d076c1015 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1772,7 +1772,11 @@ static int __dwc3_stop_active_transfer(struct dwc3_e= p *dep, bool force, bool int dep->flags |=3D DWC3_EP_DELAY_STOP; return 0; } - WARN_ON_ONCE(ret); + + if (ret) + dev_err_ratelimited(dep->dwc->dev, + "end transfer failed: %d\n", ret); + dep->resource_index =3D 0; =20 if (!interrupt) @@ -4039,7 +4043,9 @@ static void dwc3_clear_stall_all_ep(struct dwc3 *dwc) dep->flags &=3D ~DWC3_EP_STALL; =20 ret =3D dwc3_send_clear_stall_ep_cmd(dep); - WARN_ON_ONCE(ret); + if (ret) + dev_err_ratelimited(dwc->dev, + "failed to clear STALL on %s\n", dep->name); } } =20 --=20 2.17.1