From patchwork Tue Apr 28 18:25:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 226860 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, 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 21B4FC83007 for ; Tue, 28 Apr 2020 18:44:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EFF24206A1 for ; Tue, 28 Apr 2020 18:44:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588099451; bh=TeaS1cHqlCEkbfMEujQm1NjPPa5FBQpNl0nQJJvqyCU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=e9J7QnYCn5+3kkTrRxgFPBbFLHMUA2y5obJVSMK6FVzMrEkUA2zgTFiqI7LRmyhxP RFTSLUeu7V/DSHx4g5eshfUrIJ0dxa1GnQghJ90GG9EjQtkZcTEh15pF+8PNJSQxHD Gna7WS9Gj7GGWBqPoHtuHgqpxb9BnjKo39ifBOWM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731069AbgD1SoJ (ORCPT ); Tue, 28 Apr 2020 14:44:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:37020 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731344AbgD1SoH (ORCPT ); Tue, 28 Apr 2020 14:44:07 -0400 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 CD346206D6; Tue, 28 Apr 2020 18:44:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588099447; bh=TeaS1cHqlCEkbfMEujQm1NjPPa5FBQpNl0nQJJvqyCU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=msKxMmzP+M4NLKYpLIZYmeXsNB1KrrFQLxXh21VBbs+H91FkaZSGN/U00R9o1YhrQ CMs800kmOSW1ftNpWUsrNwE/r9PsH9HpXl6BLRVHDlCKdlAI8Zpv8YZES7It3ZZQKd Uy+i1fdwVcn0VUxa+Dslft+TWml22U7dOFS7Ejk4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mathias Nyman Subject: [PATCH 5.4 155/168] xhci: prevent bus suspend if a roothub port detected a over-current condition Date: Tue, 28 Apr 2020 20:25:29 +0200 Message-Id: <20200428182250.867738114@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200428182231.704304409@linuxfoundation.org> References: <20200428182231.704304409@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Mathias Nyman commit e9fb08d617bfae5471d902112667d0eeb9dee3c4 upstream. Suspending the bus and host controller while a port is in a over-current condition may halt the host. Also keep the roothub running if over-current is active. Cc: Signed-off-by: Mathias Nyman Link: https://lore.kernel.org/r/20200421140822.28233-3-mathias.nyman@linux.intel.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-hub.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/drivers/usb/host/xhci-hub.c +++ b/drivers/usb/host/xhci-hub.c @@ -1569,6 +1569,8 @@ int xhci_hub_status_data(struct usb_hcd } if ((temp & PORT_RC)) reset_change = true; + if (temp & PORT_OC) + status = 1; } if (!status && !reset_change) { xhci_dbg(xhci, "%s: stopping port polling.\n", __func__); @@ -1634,6 +1636,13 @@ retry: port_index); goto retry; } + /* bail out if port detected a over-current condition */ + if (t1 & PORT_OC) { + bus_state->bus_suspended = 0; + spin_unlock_irqrestore(&xhci->lock, flags); + xhci_dbg(xhci, "Bus suspend bailout, port over-current detected\n"); + return -EBUSY; + } /* suspend ports in U0, or bail out for new connect changes */ if ((t1 & PORT_PE) && (t1 & PORT_PLS_MASK) == XDEV_U0) { if ((t1 & PORT_CSC) && wake_enabled) {