From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751555AbbARHCa (ORCPT ); Sun, 18 Jan 2015 02:02:30 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:58752 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750710AbbARHC3 (ORCPT ); Sun, 18 Jan 2015 02:02:29 -0500 Date: Sat, 17 Jan 2015 22:25:31 -0800 From: Greg KH To: Robert Hancock Cc: linux-kernel , Linux-usb Subject: Re: 3.18 regression: Error while assigning device slot ID, USB3 devices not detected Message-ID: <20150118062531.GA8968@kroah.com> References: <54BB4DD2.1070602@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <54BB4DD2.1070602@gmail.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Jan 18, 2015 at 12:08:18AM -0600, Robert Hancock wrote: > I've got an Intel Haswell-based system with a Gigabyte Z87X-D3H motherboard > under Fedora 21. After updating to the 3.18.2-200 Fedora kernel, I noticed > some errors in dmesg and at least some of my USB3 ports don't recognize any > USB3 devices plugged into them: > > [ 0.560838] xhci_hcd 0000:00:14.0: Error while assigning device slot ID > [ 0.560912] xhci_hcd 0000:00:14.0: Max number of devices this xHCI host > supports is 32. > [ 0.560990] usb usb2-port2: couldn't allocate usb_device > [ 0.561098] xhci_hcd 0000:00:14.0: Error while assigning device slot ID > [ 0.561163] xhci_hcd 0000:00:14.0: Max number of devices this xHCI host > supports is 32. > [ 0.561239] usb usb2-port5: couldn't allocate usb_device > [ 0.561344] xhci_hcd 0000:00:14.0: Error while assigning device slot ID > [ 0.561409] xhci_hcd 0000:00:14.0: Max number of devices this xHCI host > supports is 32. > [ 0.561484] usb usb2-port6: couldn't allocate usb_device > > This worked fine under 3.17. Is this a known problem? Yes it is, should be fixed in Linus's tree now and will be backported to the latest 3.18-stable tree in a week or so. thanks, greg k-h