From patchwork Thu May 20 09:23:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 445478 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=-19.1 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, USER_AGENT_GIT autolearn=ham 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 A9B5FC433B4 for ; Thu, 20 May 2021 10:40:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8EDB960241 for ; Thu, 20 May 2021 10:40:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236481AbhETKmK (ORCPT ); Thu, 20 May 2021 06:42:10 -0400 Received: from mail.kernel.org ([198.145.29.99]:40016 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236701AbhETKkJ (ORCPT ); Thu, 20 May 2021 06:40:09 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D0F6161C7F; Thu, 20 May 2021 09:55:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621504532; bh=d+6/f3oF6CqomtznNTfk6ZJN0HErve5nwFS2UQAcDcA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gNIknNZn9QwC1qkg5o040+vhtItioA536D3hScI9sWGTXa2T8hU9hMTFlzNJgNmSf iMb7hnVJbZx2kFKW26KVWhN2Xk6KsVZ/ey75HIMi3TgHOVn0Cv6P0ajjqrd3I0194Y S4015joA9aq6gNlfu94CtmAwBc0OH8Jsf/dcDCPk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Tianping Fang , Alan Stern , Chunfeng Yun Subject: [PATCH 4.14 289/323] usb: core: hub: fix race condition about TRSMRCY of resume Date: Thu, 20 May 2021 11:23:01 +0200 Message-Id: <20210520092130.118203075@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092120.115153432@linuxfoundation.org> References: <20210520092120.115153432@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Chunfeng Yun commit 975f94c7d6c306b833628baa9aec3f79db1eb3a1 upstream. This may happen if the port becomes resume status exactly when usb_port_resume() gets port status, it still need provide a TRSMCRY time before access the device. CC: Reported-by: Tianping Fang Acked-by: Alan Stern Signed-off-by: Chunfeng Yun Link: https://lore.kernel.org/r/20210512020738.52961-1-chunfeng.yun@mediatek.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/hub.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -3496,9 +3496,6 @@ int usb_port_resume(struct usb_device *u * sequence. */ status = hub_port_status(hub, port1, &portstatus, &portchange); - - /* TRSMRCY = 10 msec */ - msleep(10); } SuspendCleared: @@ -3513,6 +3510,9 @@ int usb_port_resume(struct usb_device *u usb_clear_port_feature(hub->hdev, port1, USB_PORT_FEAT_C_SUSPEND); } + + /* TRSMRCY = 10 msec */ + msleep(10); } if (udev->persist_enabled)