3 files changed, 20 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index faf039ac6573..eafd17fae949 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -118,6 +118,10 @@ static int xhci_pci_setup(struct usb_hcd *hcd)
         /* AMD PLL quirk */
         if (pdev->vendor == PCI_VENDOR_ID_AMD && usb_amd_find_chipset_info())
                 xhci->quirks |= XHCI_AMD_PLL_FIX;
+        if (pdev->vendor == PCI_VENDOR_ID_INTEL &&
+                        pdev->device == PCI_DEVICE_ID_INTEL_PANTHERPOINT_XHCI) {
+                xhci->quirks |= XHCI_SPURIOUS_SUCCESS;
+        }
 
         /* Make sure the HC is halted. */
         retval = xhci_halt(xhci);
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index d1498c03c4cb..56f6c584c651 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2061,6 +2061,16 @@ static int handle_tx_event(struct xhci_hcd *xhci,
                 if (!event_seg) {
                         if (!ep->skip ||
                             !usb_endpoint_xfer_isoc(&td->urb->ep->desc)) {
+                                /* Some host controllers give a spurious
+                                 * successful event after a short transfer.
+                                 * Ignore it.
+                                 */
+                                if ((xhci->quirks & XHCI_SPURIOUS_SUCCESS) && 
+                                                ep_ring->last_td_was_short) {
+                                        ep_ring->last_td_was_short = false;
+                                        ret = 0;
+                                        goto cleanup;
+                                }
                                 /* HC is busted, give up! */
                                 xhci_err(xhci,
                                         "ERROR Transfer event TRB DMA ptr not "
@@ -2071,6 +2081,10 @@ static int handle_tx_event(struct xhci_hcd *xhci,
                         ret = skip_isoc_td(xhci, td, event, ep, &status);
                         goto cleanup;
                 }
+                if (trb_comp_code == COMP_SHORT_TX)
+                        ep_ring->last_td_was_short = true;
+                else
+                        ep_ring->last_td_was_short = false;
 
                 if (ep->skip) {
                         xhci_dbg(xhci, "Found td. Clear skip flag.\n");
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index 0772a8cfea23..5cfeb8614b87 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1123,6 +1123,7 @@ struct xhci_ring {
          */
         u32                     cycle_state;
         unsigned int            stream_id;
+        bool                    last_td_was_short;
 };
 
 struct xhci_erst_entry {
@@ -1290,6 +1291,7 @@ struct xhci_hcd {
 #define XHCI_RESET_EP_QUIRK     (1 << 1)
 #define XHCI_NEC_HOST           (1 << 2)
 #define XHCI_AMD_PLL_FIX        (1 << 3)
+#define XHCI_SPURIOUS_SUCCESS   (1 << 4)
         /* There are two roothubs to keep track of bus suspend info for */
         struct xhci_bus_state   bus_state[2];
         /* Is each xHCI roothub port a USB 3.0, USB 2.0, or USB 1.1 port? */