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    SubjectRe: 3.18 regression: Error while assigning device slot ID, USB3 devices not detected
    On Mon, Jan 19, 2015 at 08:28:19AM -0500, Josh Boyer wrote:
    > On Sun, Jan 18, 2015 at 1:25 AM, Greg KH <gregkh@linuxfoundation.org> wrote:
    > > 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.
    >
    > Do you happen to know the commit id?

    f161ead70fa6a62e432dff6e9dab8e3cfbeabea6


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