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usb: xhci: Reset halted endpoint if trb is noop 

When a URB is cancled, xhci driver turns the untransferred trbs
into no-ops.  If an endpoint stalls on a no-op trb that belongs
to the cancelled URB, the event handler won't reset the endpoint.
Hence, it will stay halted.

Link: http://marc.info/?l=linux-usb&m=149582598330127&w=2

Cc: <stable@vger.kernel.org>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lu Baolu 2017-10-06 17:45:29 +03:00 committed by Greg Kroah-Hartman
parent d1aad52cf8
commit 810a624bd1
1 changed files with 13 additions and 7 deletions
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20
drivers/usb/host/xhci-ring.c
View File

@ -2580,15 +2580,21 @@ static int handle_tx_event(struct xhci_hcd *xhci,
(struct xhci_generic_trb *) ep_trb);
/*
* No-op TRB should not trigger interrupts.
* If ep_trb is a no-op TRB, it means the
* corresponding TD has been cancelled. Just ignore
* the TD.
* No-op TRB could trigger interrupts in a case where
* a URB was killed and a STALL_ERROR happens right
* after the endpoint ring stopped. Reset the halted
* endpoint. Otherwise, the endpoint remains stalled
* indefinitely.
*/
if (trb_is_noop(ep_trb)) {
xhci_dbg(xhci,
"ep_trb is a no-op TRB. Skip it for slot %u ep %u\n",
slot_id, ep_index);
if (trb_comp_code == COMP_STALL_ERROR ||
xhci_requires_manual_halt_cleanup(xhci, ep_ctx,
trb_comp_code))
xhci_cleanup_halted_endpoint(xhci, slot_id,
ep_index,
ep_ring->stream_id,
td, ep_trb,
EP_HARD_RESET);
goto cleanup;
}