staging: fsl-dpaa2/eth: Check if notification rearm is successful

In case dpaa2_io_service_rearm() fails with an error other then
EBUSY, it will do so silently; add a check for this and a warning
message, as a failure here means we're unable to receive any
more traffic on the current cpu.
Signed-off-by: Ioana Radulescu <ruxandra.radulescu@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c

@@ -955,6 +955,8 @@ static int dpaa2_eth_poll(struct napi_struct *napi, int budget)
 			err = dpaa2_io_service_rearm(NULL, &ch->nctx);
 			cpu_relax();
 		} while (err == -EBUSY);
+		WARN_ONCE(err, "CDAN notifications rearm failed on core %d",
+			  ch->nctx.desired_cpu);
 	}
 
 	ch->stats.frames += cleaned;