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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,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 C8861C2D0BF for ; Mon, 16 Dec 2019 18:42:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A27B5206A5 for ; Mon, 16 Dec 2019 18:42:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576521745; bh=AtPJOJjZvSlxSemNifGn2AXG+FwEBWhSA7Wid+V8wcA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=c7p3roLGPLwX1W88vkO6KmUKUGsvecRqFKp7BE1yLeKEECMMHsVTh85rZw84WxkfX ld4ksuy4kpxfbwk8jp7KYW7yJJeTzQE1r/IjbYN0URcLjkI4viU8oHvD1L2z0ORXS0 DzGT1DJLfyW8ryeWe1wGBBpIfcX33RBEL15m0BVA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727777AbfLPSAX (ORCPT ); Mon, 16 Dec 2019 13:00:23 -0500 Received: from mail.kernel.org ([198.145.29.99]:34284 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728741AbfLPSAT (ORCPT ); Mon, 16 Dec 2019 13:00:19 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C7235206B7; Mon, 16 Dec 2019 18:00:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576519219; bh=AtPJOJjZvSlxSemNifGn2AXG+FwEBWhSA7Wid+V8wcA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UAV44f31wkLTDs8/tZ1NTaVYpGT2AglqlhgSTqjm1b0bj34kA4ruR2s0Jv+vkm1WW In8eO+cLWIjhiR9S8iL5d5czNlMJY0rI1TZsYkHAliUYuZ/1fllLZYGL7oXEASZ+7x JwKvO4y9OJbbfzgHaTT/wOgb4VEqeCw/om60BIGM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mathias Nyman , Sasha Levin Subject: [PATCH 4.14 245/267] xhci: make sure interrupts are restored to correct state Date: Mon, 16 Dec 2019 18:49:31 +0100 Message-Id: <20191216174915.981408128@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191216174848.701533383@linuxfoundation.org> References: <20191216174848.701533383@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mathias Nyman [ Upstream commit bd82873f23c9a6ad834348f8b83f3b6a5bca2c65 ] 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. Cc: # v3.12+ 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 --- drivers/usb/host/xhci-hub.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c index 997ff183c9cbb..95503bb9b067d 100644 --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -855,7 +855,7 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd, 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) { @@ -937,12 +937,12 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd, 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, @@ -1090,7 +1090,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, break; } status = xhci_get_port_status(hcd, bus_state, port_array, - wIndex, temp, flags); + wIndex, temp, &flags); if (status == 0xffffffff) goto error; -- 2.20.1