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    Subject[PATCH 4.13 075/160] xhci: fix finding correct bus_state structure for USB 3.1 hosts
    Date
    4.13-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Mathias Nyman <mathias.nyman@linux.intel.com>

    commit 5a838a13c9b4e5dd188b7a6eaeb894e9358ead0c upstream.

    xhci driver keeps a bus_state structure for each hcd (usb2 and usb3)

    The structure is picked based on hcd speed, but driver only compared
    for HCD_USB3 speed, returning the wrong bus_state for HCD_USB31 hosts.

    This caused null pointer dereference errors in bus_resume function.

    Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/usb/host/xhci.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/drivers/usb/host/xhci.h
    +++ b/drivers/usb/host/xhci.h
    @@ -1674,7 +1674,7 @@ struct xhci_bus_state {

    static inline unsigned int hcd_index(struct usb_hcd *hcd)
    {
    - if (hcd->speed == HCD_USB3)
    + if (hcd->speed >= HCD_USB3)
    return 0;
    else
    return 1;

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