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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no 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 CE528C54FCB for ; Thu, 23 Apr 2020 23:18:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE30B20780 for ; Thu, 23 Apr 2020 23:18:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728897AbgDWXST (ORCPT ); Thu, 23 Apr 2020 19:18:19 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:49088 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728285AbgDWXGj (ORCPT ); Thu, 23 Apr 2020 19:06:39 -0400 Received: from [192.168.4.242] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1jRkvQ-0004fp-6l; Fri, 24 Apr 2020 00:06:32 +0100 Received: from ben by deadeye with local (Exim 4.93) (envelope-from ) id 1jRkvO-00E6mk-L2; Fri, 24 Apr 2020 00:06:30 +0100 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, Denis Kirjanov , "Mathias Nyman" , "Sasha Levin" , "Greg Kroah-Hartman" Date: Fri, 24 Apr 2020 00:05:23 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) X-Patchwork-Hint: ignore Subject: [PATCH 3.16 096/245] xhci: make sure interrupts are restored to correct state In-Reply-To: X-SA-Exim-Connect-IP: 192.168.4.242 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.83-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Mathias Nyman commit bd82873f23c9a6ad834348f8b83f3b6a5bca2c65 upstream. spin_unlock_irqrestore() might be called with stale flags after reading port status, possibly restoring interrupts to a incorrect state. If a usb2 port just finished resuming while the port status is read the spin lock will be temporary released and re-acquired in a separate function. The flags parameter is passed as value instead of a pointer, not updating flags properly before the final spin_unlock_irqrestore() is called. Fixes: 8b3d45705e54 ("usb: Fix xHCI host issues on remote wakeup.") Signed-off-by: Mathias Nyman Link: https://lore.kernel.org/r/20191211142007.8847-7-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin Signed-off-by: Ben Hutchings --- drivers/usb/host/xhci-hub.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -580,7 +580,7 @@ static u32 xhci_get_port_status(struct u struct xhci_bus_state *bus_state, __le32 __iomem **port_array, u16 wIndex, u32 raw_port_status, - unsigned long flags) + unsigned long *flags) __releases(&xhci->lock) __acquires(&xhci->lock) { @@ -670,12 +670,12 @@ static u32 xhci_get_port_status(struct u xhci_set_link_state(xhci, port_array, wIndex, XDEV_U0); - spin_unlock_irqrestore(&xhci->lock, flags); + spin_unlock_irqrestore(&xhci->lock, *flags); time_left = wait_for_completion_timeout( &bus_state->rexit_done[wIndex], msecs_to_jiffies( XHCI_MAX_REXIT_TIMEOUT_MS)); - spin_lock_irqsave(&xhci->lock, flags); + spin_lock_irqsave(&xhci->lock, *flags); if (time_left) { slot_id = xhci_find_slot_id_by_port(hcd, @@ -834,7 +834,7 @@ int xhci_hub_control(struct usb_hcd *hcd break; } status = xhci_get_port_status(hcd, bus_state, port_array, - wIndex, temp, flags); + wIndex, temp, &flags); if (status == 0xffffffff) goto error;