Index: sys/dev/pci/ixgbe/ix_txrx.c
===================================================================
RCS file: /home/netbsd/src/sys/dev/pci/ixgbe/ix_txrx.c,v
retrieving revision 1.71
diff -p -u -r1.71 ix_txrx.c
--- sys/dev/pci/ixgbe/ix_txrx.c	30 Apr 2021 06:55:32 -0000	1.71
+++ sys/dev/pci/ixgbe/ix_txrx.c	8 May 2021 23:16:04 -0000
@@ -1766,16 +1766,17 @@ ixgbe_rx_discard(struct rx_ring *rxr, in
 	if (rbuf->fmp != NULL) {/* Partial chain ? */
 		bus_dmamap_sync(rxr->ptag->dt_dmat, rbuf->pmap, 0,
 		    rbuf->buf->m_pkthdr.len, BUS_DMASYNC_POSTREAD);
+		ixgbe_dmamap_unload(rxr->ptag, rbuf->pmap);
 		m_freem(rbuf->fmp);
 		rbuf->fmp = NULL;
 		rbuf->buf = NULL; /* rbuf->buf is part of fmp's chain */
 	} else if (rbuf->buf) {
 		bus_dmamap_sync(rxr->ptag->dt_dmat, rbuf->pmap, 0,
 		    rbuf->buf->m_pkthdr.len, BUS_DMASYNC_POSTREAD);
+		ixgbe_dmamap_unload(rxr->ptag, rbuf->pmap);
 		m_free(rbuf->buf);
 		rbuf->buf = NULL;
 	}
-	ixgbe_dmamap_unload(rxr->ptag, rbuf->pmap);
 
 	rbuf->flags = 0;