From patchwork Wed May 4 16:44:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 569743 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0723AC433EF for ; Wed, 4 May 2022 17:07:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346068AbiEDRLH (ORCPT ); Wed, 4 May 2022 13:11:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39216 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1356796AbiEDRJo (ORCPT ); Wed, 4 May 2022 13:09:44 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 202391D326; Wed, 4 May 2022 09:55:36 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 837F1B82795; Wed, 4 May 2022 16:55:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1E7F1C385AF; Wed, 4 May 2022 16:55:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1651683336; bh=syvbfAMOEbim3F1NblPad85qNNOn39u3qZiZAyUDIdY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YPL0fLsjFSg9n75m686DLMEVV8iHC8giQRgx8pWG/TzZsUkp/aC4EVLRJP5tKWJCG H0mS2IWTOStB6zH57PCGWuBdrBS3h+bZGXNsxmJ5LMo7oMnDNPNnJcZbsnYQvxHTrC 6e4ku9O8MOwvaxHQPO/t8MECKZLNg4ammG9XmDyI= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Henry Lin , Mathias Nyman Subject: [PATCH 5.17 011/225] xhci: stop polling roothubs after shutdown Date: Wed, 4 May 2022 18:44:09 +0200 Message-Id: <20220504153111.278638853@linuxfoundation.org> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20220504153110.096069935@linuxfoundation.org> References: <20220504153110.096069935@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Henry Lin commit dc92944a014cd6a6f6c94299aaa36164dd2c238a upstream. While rebooting, XHCI controller and its bus device will be shut down in order by .shutdown callback. Stopping roothubs polling in xhci_shutdown() can prevent XHCI driver from accessing port status after its bus device shutdown. Take PCIe XHCI controller as example, if XHCI driver doesn't stop roothubs polling, XHCI driver may access PCIe BAR register for port status after parent PCIe root port driver is shutdown and cause PCIe bus error. [check shared hcd exist before stopping its roothub polling -Mathias] Cc: stable@vger.kernel.org Signed-off-by: Henry Lin Signed-off-by: Mathias Nyman Link: https://lore.kernel.org/r/20220408134823.2527272-3-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci.c | 11 +++++++++++ 1 file changed, 11 insertions(+) --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -778,6 +778,17 @@ void xhci_shutdown(struct usb_hcd *hcd) if (xhci->quirks & XHCI_SPURIOUS_REBOOT) usb_disable_xhci_ports(to_pci_dev(hcd->self.sysdev)); + /* Don't poll the roothubs after shutdown. */ + xhci_dbg(xhci, "%s: stopping usb%d port polling.\n", + __func__, hcd->self.busnum); + clear_bit(HCD_FLAG_POLL_RH, &hcd->flags); + del_timer_sync(&hcd->rh_timer); + + if (xhci->shared_hcd) { + clear_bit(HCD_FLAG_POLL_RH, &xhci->shared_hcd->flags); + del_timer_sync(&xhci->shared_hcd->rh_timer); + } + spin_lock_irq(&xhci->lock); xhci_halt(xhci); /* Workaround for spurious wakeups at shutdown with HSW */