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=-19.5 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 71C90C41537 for ; Mon, 26 Jul 2021 16:36:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6AAEE6056B for ; Mon, 26 Jul 2021 16:36:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239805AbhGZPy0 (ORCPT ); Mon, 26 Jul 2021 11:54:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:50014 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234076AbhGZPdL (ORCPT ); Mon, 26 Jul 2021 11:33:11 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7DE5B60F6E; Mon, 26 Jul 2021 16:13:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1627316019; bh=qdDUhtH1RMcmf8jAB5w9NHZPD0X2nkHB17/R4wnl74g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CMgdjqs33TStMCzl5Q64GQb7Z89bQ4oMYuB08570U4ZqFU6oOyREn0HdG6BAEWQDA zWf1o8Hbr/Fs/blJXauTLv61a+PX7V1wkiHXaIIs9l0QA2oMUPIVY6G59DZRs+rSuO MAV/cJWAXDWlHEiwyFaN88XEMwX08A478ibx9oUg= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mathias Nyman Subject: [PATCH 5.13 157/223] xhci: Fix lost USB 2 remote wake Date: Mon, 26 Jul 2021 17:39:09 +0200 Message-Id: <20210726153851.353857680@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210726153846.245305071@linuxfoundation.org> References: <20210726153846.245305071@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: Mathias Nyman commit 72f68bf5c756f5ce1139b31daae2684501383ad5 upstream. There's a small window where a USB 2 remote wake may be left unhandled due to a race between hub thread and xhci port event interrupt handler. When the resume event is detected in the xhci interrupt handler it kicks the hub timer, which should move the port from resume to U0 once resume has been signalled for long enough. To keep the hub "thread" running we set a bus_state->resuming_ports flag. This flag makes sure hub timer function kicks itself. checking this flag was not properly protected by the spinlock. Flag was copied to a local variable before lock was taken. The local variable was then checked later with spinlock held. If interrupt is handled right after copying the flag to the local variable we end up stopping the hub thread before it can handle the USB 2 resume. CPU0 CPU1 (hub thread) (xhci event handler) xhci_hub_status_data() status = bus_state->resuming_ports; handle_port_status() spin_lock() bus_state->resuming_ports = 1 set_flag(HCD_FLAG_POLL_RH) spin_unlock() spin_lock() if (!status) clear_flag(HCD_FLAG_POLL_RH) spin_unlock() Fix this by taking the lock a bit earlier so that it covers the resuming_ports flag copy in the hub thread Cc: Signed-off-by: Mathias Nyman Link: https://lore.kernel.org/r/20210715150651.1996099-2-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-hub.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -1638,11 +1638,12 @@ int xhci_hub_status_data(struct usb_hcd * Inform the usbcore about resume-in-progress by returning * a non-zero value even if there are no status changes. */ + spin_lock_irqsave(&xhci->lock, flags); + status = bus_state->resuming_ports; mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC | PORT_WRC | PORT_CEC; - spin_lock_irqsave(&xhci->lock, flags); /* For each port, did anything change? If so, set that bit in buf. */ for (i = 0; i < max_ports; i++) { temp = readl(ports[i]->addr);