Fail and WARN if DMA counters are wrong.
Signed-off-by: Aaro Koskinen <aaro.koskinen@xxxxxx>
---
drivers/staging/octeon-usb/octeon-hcd.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/staging/octeon-usb/octeon-hcd.c b/drivers/staging/octeon-usb/octeon-hcd.c
index c761a39..54c23c4 100644
--- a/drivers/staging/octeon-usb/octeon-hcd.c
+++ b/drivers/staging/octeon-usb/octeon-hcd.c
@@ -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
--
2.2.0
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