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>

diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index caf87428ca43c3f38985d9469b566645ea3d3bf9..ac53a662a6a306cd96b77f69ff154ed8534d6f2f 100644 (file)
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -867,6 +867,12 @@ static void __devinit quirk_usb_handoff_xhci(struct pci_dev *pdev)
 
 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)