From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1EA81C432BE for ; Fri, 13 Aug 2021 15:18:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0701360F51 for ; Fri, 13 Aug 2021 15:18:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242673AbhHMPS0 (ORCPT ); Fri, 13 Aug 2021 11:18:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:57786 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242057AbhHMPN1 (ORCPT ); Fri, 13 Aug 2021 11:13:27 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 88807610FD; Fri, 13 Aug 2021 15:13:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1628867581; bh=0wmAJK9LQ9huGzhhOYIUOTbOUqZtAupZVriyIAhyde8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tVpFW8IV54nQkxipurYOKY1Xpfa6z+ye65w6LtreRRvK32bao+bJdWHu9TRUJiV2d asLjh+nP5yK1GRKlLd8XS19wHhyBpgYuHpaaHSPhkH4T13hYWMzAQEP6bAEo9GEds8 pTKMMnFBwrNO2tvh3OTGyRE0SwGuowrWyB8tz2uc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "stable@vger.kernel.org, Wesley Cheng" , Felipe Balbi , Wesley Cheng Subject: [PATCH 5.4 11/27] usb: dwc3: gadget: Avoid runtime resume if disabling pullup Date: Fri, 13 Aug 2021 17:07:09 +0200 Message-Id: <20210813150523.735953975@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210813150523.364549385@linuxfoundation.org> References: <20210813150523.364549385@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Wesley Cheng [ Upstream commit cb10f68ad8150f243964b19391711aaac5e8ff42 ] If the device is already in the runtime suspended state, any call to the pullup routine will issue a runtime resume on the DWC3 core device. If the USB gadget is disabling the pullup, then avoid having to issue a runtime resume, as DWC3 gadget has already been halted/stopped. This fixes an issue where the following condition occurs: usb_gadget_remove_driver() -->usb_gadget_disconnect() -->dwc3_gadget_pullup(0) -->pm_runtime_get_sync() -> ret = 0 -->pm_runtime_put() [async] -->usb_gadget_udc_stop() -->dwc3_gadget_stop() -->dwc->gadget_driver = NULL ... dwc3_suspend_common() -->dwc3_gadget_suspend() -->DWC3 halt/stop routine skipped, driver_data == NULL This leads to a situation where the DWC3 gadget is not properly stopped, as the runtime resume would have re-enabled EP0 and event interrupts, and since we avoided the DWC3 gadget suspend, these resources were never disabled. Fixes: 77adb8bdf422 ("usb: dwc3: gadget: Allow runtime suspend if UDC unbinded") Cc: stable Acked-by: Felipe Balbi Signed-off-by: Wesley Cheng Link: https://lore.kernel.org/r/1628058245-30692-1-git-send-email-wcheng@codeaurora.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc3/gadget.c | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -2019,6 +2019,17 @@ static int dwc3_gadget_pullup(struct usb } /* + * Avoid issuing a runtime resume if the device is already in the + * suspended state during gadget disconnect. DWC3 gadget was already + * halted/stopped during runtime suspend. + */ + if (!is_on) { + pm_runtime_barrier(dwc->dev); + if (pm_runtime_suspended(dwc->dev)) + return 0; + } + + /* * Check the return value for successful resume, or error. For a * successful resume, the DWC3 runtime PM resume routine will handle * the run stop sequence, so avoid duplicate operations here.