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xhci: don't finish a TD if we get a short transfer event mid TD 

If the difference is big enough between the bytes asked and received
in a bulk transfer we can get a short transfer event pointing to a TRB in
the middle of the TD. We don't want to handle the TD yet as we will anyway
receive a new event for the last TRB in the TD.

Hold off from finishing the TD and removing it from the list until we
receive an event for the last TRB in the TD

Cc: stable <stable@vger.kernel.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathias Nyman 2015-10-12 11:30:11 +03:00 committed by Greg Kroah-Hartman
parent 25cb62b764
commit e210c422b6
1 changed files with 10 additions and 0 deletions
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10
drivers/usb/host/xhci-ring.c
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@ -2191,6 +2191,10 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td,
}
/* Fast path - was this the last TRB in the TD for this URB? */
} else if (event_trb == td->last_trb) {
if (td->urb_length_set && trb_comp_code == COMP_SHORT_TX)
return finish_td(xhci, td, event_trb, event, ep,
status, false);
if (EVENT_TRB_LEN(le32_to_cpu(event->transfer_len)) != 0) {
td->urb->actual_length =
td->urb->transfer_buffer_length -
@ -2242,6 +2246,12 @@ static int process_bulk_intr_td(struct xhci_hcd *xhci, struct xhci_td *td,
td->urb->actual_length +=
TRB_LEN(le32_to_cpu(cur_trb->generic.field[2])) -
EVENT_TRB_LEN(le32_to_cpu(event->transfer_len));
if (trb_comp_code == COMP_SHORT_TX) {
xhci_dbg(xhci, "mid bulk/intr SP, wait for last TRB event\n");
td->urb_length_set = true;
return 0;
}
}
return finish_td(xhci, td, event_trb, event, ep, status, false);