From patchwork Thu Aug 4 15:09:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 12936473 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D74B8C3F6B0 for ; Thu, 4 Aug 2022 15:10:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239397AbiHDPKE (ORCPT ); Thu, 4 Aug 2022 11:10:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47308 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234093AbiHDPJ5 (ORCPT ); Thu, 4 Aug 2022 11:09:57 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 375A651A00; Thu, 4 Aug 2022 08:09:56 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id C65296102A; Thu, 4 Aug 2022 15:09:55 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1D6A4C433C1; Thu, 4 Aug 2022 15:09:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1659625795; bh=VUaMhxBQV8r/Oni90w/+gnoNx4Bzx7lOs5aOtZB5EB0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GoPRHKvmlGVaXGsNbciqHSCl8N4I00QdRgFPkAwt2VxUrNIQBCbZdqmK2xgwy/9ub tcXmJbbbcOh2MoKfMLqhNfDanyrWIm1u0oDzX1rwY62fgZz97V4KUwWUDkqS+Gssaz EdFiyZOcbyQQIwbk4L0AsuoevmXgvweV/I3uI2cnlLIr1vDjVsDzS9e46KphRlEW4j 4gqIdamg4xfDf0HYTXBM7MddJ+Dy/C5I14aURtVMh6mRuR7KfK7125Tvu5MUcCAve0 oSWqjUpugNeIeoZqPdpwBmhSC10ZHrd+wGi2rZc63K5Z0etGRCe6H2lEIVUUOuT7Lu E1yYdAsAeyr3w== Received: from johan by xi.lan with local (Exim 4.94.2) (envelope-from ) id 1oJcUL-00069a-99; Thu, 04 Aug 2022 17:10:17 +0200 From: Johan Hovold To: Greg Kroah-Hartman , Felipe Balbi Cc: Rob Herring , Krzysztof Kozlowski , Andy Gross , Bjorn Andersson , Manivannan Sadhasivam , Konrad Dybcio , Krishna Kurapati , Stephen Boyd , Doug Anderson , "Matthias Kaehlcke" , Pavankumar Kondeti , quic_ppratap@quicinc.com, quic_vpulyala@quicinc.com, linux-arm-msm@vger.kernel.org, linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold Subject: [PATCH v2 6/9] usb: dwc3: qcom: fix peripheral and OTG suspend Date: Thu, 4 Aug 2022 17:09:58 +0200 Message-Id: <20220804151001.23612-7-johan+linaro@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220804151001.23612-1-johan+linaro@kernel.org> References: <20220804151001.23612-1-johan+linaro@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org A recent commit implementing wakeup support in host mode instead broke suspend for peripheral and OTG mode. The hack that was added in the suspend path to determine the speed of any device connected to the USB2 bus not only accesses internal driver data for a child device, but also dereferences a NULL pointer or accesses freed data when the controller is not acting as host. There's no quick fix to the layering violation, but since reverting would leave us with broken suspend in host mode with wakeup triggering immediately, let's keep the hack for now. Fix the immediate issues by only checking the host bus speed and enabling wakeup interrupts when acting as host. Fixes: 6895ea55c385 ("usb: dwc3: qcom: Configure wakeup interrupts during suspend") Signed-off-by: Johan Hovold Reported-by: kernel test robot --- Changes in v2 - disable wakeup completely instead of falling back to the "disconnected" host configuration when not acting as host drivers/usb/dwc3/dwc3-qcom.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c index 05b4666fde14..6ae0b7fc4e2c 100644 --- a/drivers/usb/dwc3/dwc3-qcom.c +++ b/drivers/usb/dwc3/dwc3-qcom.c @@ -309,8 +309,13 @@ static bool dwc3_qcom_is_host(struct dwc3_qcom *qcom) static enum usb_device_speed dwc3_qcom_read_usb2_speed(struct dwc3_qcom *qcom) { struct dwc3 *dwc = platform_get_drvdata(qcom->dwc3); - struct usb_hcd *hcd = platform_get_drvdata(dwc->xhci); struct usb_device *udev; + struct usb_hcd *hcd; + + /* + * FIXME: Fix this layering violation. + */ + hcd = platform_get_drvdata(dwc->xhci); /* * It is possible to query the speed of all children of @@ -416,7 +421,11 @@ static int dwc3_qcom_suspend(struct dwc3_qcom *qcom, bool wakeup) if (ret) dev_warn(qcom->dev, "failed to disable interconnect: %d\n", ret); - if (wakeup) { + /* + * The role is stable during suspend as role switching is done from a + * freezable workqueue. + */ + if (dwc3_qcom_is_host(qcom) && wakeup) { qcom->usb2_speed = dwc3_qcom_read_usb2_speed(qcom); dwc3_qcom_enable_interrupts(qcom); } @@ -434,7 +443,7 @@ static int dwc3_qcom_resume(struct dwc3_qcom *qcom, bool wakeup) if (!qcom->is_suspended) return 0; - if (wakeup) + if (dwc3_qcom_is_host(qcom) && wakeup) dwc3_qcom_disable_interrupts(qcom); for (i = 0; i < qcom->num_clocks; i++) {