usb: Skip PCI USB quirk handling for Netlogic XLP

The Netlogic XLP SoC's on-chip USB controller appears as a PCI
USB device, but does not need the EHCI/OHCI handoff done in
usb/host/pci-quirks.c.

The pci-quirks.c is enabled for all vendors and devices, and is
enabled if USB and PCI are configured.

If we do not skip the qurik handling on XLP, the readb() call in
ehci_bios_handoff() will cause a crash since byte access is not
supported for EHCI registers in XLP.

Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
Cc: stable <stable@vger.kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index caf87428ca4..ac53a662a6a 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -867,6 +867,12 @@ hc_init:
 
 static void __devinit quirk_usb_early_handoff(struct pci_dev *pdev)
 {
+        /* Skip Netlogic mips SoC's internal PCI USB controller.
+         * This device does not need/support EHCI/OHCI handoff
+         */
+        if (pdev->vendor == 0x184e)     /* vendor Netlogic */
+                return;
+
         if (pdev->class == PCI_CLASS_SERIAL_USB_UHCI)
                 quirk_usb_handoff_uhci(pdev);
         else if (pdev->class == PCI_CLASS_SERIAL_USB_OHCI)