linux-kernel - 3.18 regression: Error while assigning device slot ID, USB3 devices not detected

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Message-ID: <54BB4DD2.1070602@gmail.com>
Date:	Sun, 18 Jan 2015 00:08:18 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	Linux-usb <linux-usb@...r.kernel.org>
Subject: 3.18 regression: Error while assigning device slot ID, USB3 devices
 not detected

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?
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