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authorMathias Nyman <mathias.nyman@linux.intel.com>2015-10-12 11:30:12 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-11-09 12:50:25 -0800
commit2a95d40851bb497e14b8168454d2e9470e821a41 (patch)
tree3c23b6104f68baf7964d79fa6e21df4a7978dcce
parentbb601ba313dd3b1a7fd78b6a64b6b069627afda5 (diff)
downloadlwn-2a95d40851bb497e14b8168454d2e9470e821a41.tar.gz
lwn-2a95d40851bb497e14b8168454d2e9470e821a41.zip
xhci: handle no ping response error properly
commit 3b4739b8951d650becbcd855d7d6f18ac98a9a85 upstream. If a host fails to wake up a isochronous SuperSpeed device from U1/U2 in time for a isoch transfer it will generate a "No ping response error" Host will then move to the next transfer descriptor. Handle this case in the same way as missed service errors, tag the current TD as skipped and handle it on the next transfer event. Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/usb/host/xhci-ring.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index 86a0ddd8efb7..bd993fe00e0c 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -2417,6 +2417,7 @@ static int handle_tx_event(struct xhci_hcd *xhci,
u32 trb_comp_code;
int ret = 0;
int td_num = 0;
+ bool handling_skipped_tds = false;
slot_id = TRB_TO_SLOT_ID(le32_to_cpu(event->flags));
xdev = xhci->devs[slot_id];
@@ -2550,6 +2551,10 @@ static int handle_tx_event(struct xhci_hcd *xhci,
ep->skip = true;
xhci_dbg(xhci, "Miss service interval error, set skip flag\n");
goto cleanup;
+ case COMP_PING_ERR:
+ ep->skip = true;
+ xhci_dbg(xhci, "No Ping response error, Skip one Isoc TD\n");
+ goto cleanup;
default:
if (xhci_is_vendor_info_code(xhci, trb_comp_code)) {
status = 0;
@@ -2681,13 +2686,18 @@ static int handle_tx_event(struct xhci_hcd *xhci,
ep, &status);
cleanup:
+
+
+ handling_skipped_tds = ep->skip &&
+ trb_comp_code != COMP_MISSED_INT &&
+ trb_comp_code != COMP_PING_ERR;
+
/*
- * Do not update event ring dequeue pointer if ep->skip is set.
- * Will roll back to continue process missed tds.
+ * Do not update event ring dequeue pointer if we're in a loop
+ * processing missed tds.
*/
- if (trb_comp_code == COMP_MISSED_INT || !ep->skip) {
+ if (!handling_skipped_tds)
inc_deq(xhci, xhci->event_ring);
- }
if (ret) {
urb = td->urb;
@@ -2722,7 +2732,7 @@ cleanup:
* Process them as short transfer until reach the td pointed by
* the event.
*/
- } while (ep->skip && trb_comp_code != COMP_MISSED_INT);
+ } while (handling_skipped_tds);
return 0;
}