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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 38EF0CA9EA0 for ; Fri, 18 Oct 2019 22:16:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0CA4821852 for ; Fri, 18 Oct 2019 22:16:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571436996; bh=H12XsaAVdOeeHzLMIlQdJrBU963KqbPjLFf+EN77ZTo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=qRFiZBFJr9+LXs//mlX1gB/97L0Tkc8lHKFnLtcNYKHp6qKaMlP/vom9kaLMV31XK I6YVPzAtlK55Xpv3bjOjbVYM8gHwrapm5OtPmJSKckh81VdmdT2yZCF6IwHC6eHhvS SlnYXUp+17k+pzxISpQ62p8swwnZKYEODDhzh5R8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392954AbfJRWQ3 (ORCPT ); Fri, 18 Oct 2019 18:16:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:40706 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387662AbfJRWIS (ORCPT ); Fri, 18 Oct 2019 18:08:18 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0E3A7222D4; Fri, 18 Oct 2019 22:08:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571436497; bh=H12XsaAVdOeeHzLMIlQdJrBU963KqbPjLFf+EN77ZTo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mQwi+LXRG/wOHZTyi4GXvezuQoXlgqhmwQqapGKgo21II7SxmDx5cZTu9DoKW3iQ8 1hJzM+2EzGWvDq6pqq2KTn6LhGp5Eaz0ePD8k79YdH+HGuBEVsCuTVTpB7ZezX2GWI bzeQLjti8mA15jbLGTeLKkzJzE36RM/+4K/mRsLY= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jan-Marek Glogowski , Alan Stern , Greg Kroah-Hartman , Sasha Levin , linux-usb@vger.kernel.org Subject: [PATCH AUTOSEL 4.14 11/56] usb: handle warm-reset port requests on hub resume Date: Fri, 18 Oct 2019 18:07:08 -0400 Message-Id: <20191018220753.10002-11-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191018220753.10002-1-sashal@kernel.org> References: <20191018220753.10002-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jan-Marek Glogowski [ Upstream commit 4fdc1790e6a9ef22399c6bc6e63b80f4609f3b7e ] On plug-in of my USB-C device, its USB_SS_PORT_LS_SS_INACTIVE link state bit is set. Greping all the kernel for this bit shows that the port status requests a warm-reset this way. This just happens, if its the only device on the root hub, the hub therefore resumes and the HCDs status_urb isn't yet available. If a warm-reset request is detected, this sets the hubs event_bits, which will prevent any auto-suspend and allows the hubs workqueue to warm-reset the port later in port_event. Signed-off-by: Jan-Marek Glogowski Acked-by: Alan Stern Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/core/hub.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index b543a4730ef24..bb20aa433e984 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -104,6 +104,8 @@ EXPORT_SYMBOL_GPL(ehci_cf_port_reset_rwsem); static void hub_release(struct kref *kref); static int usb_reset_and_verify_device(struct usb_device *udev); static int hub_port_disable(struct usb_hub *hub, int port1, int set_state); +static bool hub_port_warm_reset_required(struct usb_hub *hub, int port1, + u16 portstatus); static inline char *portspeed(struct usb_hub *hub, int portstatus) { @@ -1110,6 +1112,11 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type) USB_PORT_FEAT_ENABLE); } + /* Make sure a warm-reset request is handled by port_event */ + if (type == HUB_RESUME && + hub_port_warm_reset_required(hub, port1, portstatus)) + set_bit(port1, hub->event_bits); + /* * Add debounce if USB3 link is in polling/link training state. * Link will automatically transition to Enabled state after -- 2.20.1