staging: octeon-usb: fail and warn if DMA counters are wrong (f3b8edc0) · Commits · e / devices / android_kernel_fairphone_FP3

drivers/staging/octeon-usb/octeon-hcd.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -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