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staging: octeon-usb: fail and warn if DMA counters are wrong

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Fail and WARN if DMA counters are wrong.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aaro Koskinen 2015-03-22 17:38:00 +02:00 committed by Greg Kroah-Hartman
parent eb04114f37
commit f3b8edc0f3
1 changed files with 11 additions and 0 deletions
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11
drivers/staging/octeon-usb/octeon-hcd.c
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@ -2617,6 +2617,17 @@ static int cvmx_usb_poll_channel(struct cvmx_usb_state *usb, int channel)
(pipe->transfer_dir == CVMX_USB_DIRECTION_OUT))
pipe->flags |= CVMX_USB_PIPE_FLAGS_NEED_PING;
if (unlikely(WARN_ON_ONCE(bytes_this_transfer < 0))) {
/*
* In some rare cases the DMA engine seems to get stuck and
* keeps substracting same byte count over and over again. In
* such case we just need to fail every transaction.
*/
cvmx_usb_perform_complete(usb, pipe, transaction,
CVMX_USB_COMPLETE_ERROR);
return 0;
}
if (usbc_hcint.s.stall) {
/*
* STALL as a response means this transaction cannot be