xhci: Don't let the USB core disable SuperSpeed ports.

Disabling SuperSpeed ports is a Very Bad Thing (TM).  It disables
SuperSpeed terminations, which means that devices will never connect at
SuperSpeed on that port.  For USB 2.0/1.1 ports, disabling the port meant
that the USB core could always get a connect status change later.  That's
not true with USB 3.0 ports.

Do not let the USB core disable SuperSpeed ports.  We can't rely on the
device speed in the port status registers, since that isn't valid until
there's a USB device connected to the port.  Instead, we use the port
speed array that's created from the Extended Capabilities registers.

Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Tested-by: Don Zickus <dzickus@redhat.com>
Cc: stable@kernel.org

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index fef5a1f9d483ac99a49f9c904ea2c7f692442ace..5d963e350494ee44983e6ac72428899e32db9a04 100644 (file)
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -229,6 +229,13 @@ void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
 static void xhci_disable_port(struct xhci_hcd *xhci, u16 wIndex,
                u32 __iomem *addr, u32 port_status)
 {
+       /* Don't allow the USB core to disable SuperSpeed ports. */
+       if (xhci->port_array[wIndex] == 0x03) {
+               xhci_dbg(xhci, "Ignoring request to disable "
+                               "SuperSpeed port.\n");
+               return;
+       }
+
        /* Write 1 to disable the port */
        xhci_writel(xhci, port_status | PORT_PE, addr);
        port_status = xhci_readl(xhci, addr);