Index: sys/dev/iwm/if_iwm.c
===================================================================
--- sys/dev/iwm/if_iwm.c
+++ sys/dev/iwm/if_iwm.c
@@ -2781,23 +2781,15 @@
 			return error;
 		}
 		/* Too many DMA segments, linearize mbuf. */
-		MGETHDR(m1, M_NOWAIT, MT_DATA);
+		m1 = m_collapse(m, M_NOWAIT, IWM_MAX_SCATTER - 1);
 		if (m1 == NULL) {
+			device_printf(sc->sc_dev,
+			    "%s: could not defrag mbuf\n", __func__);
 			m_freem(m);
-			return ENOBUFS;
-		}
-		if (m->m_pkthdr.len > MHLEN) {
-			MCLGET(m1, M_NOWAIT);
-			if (!(m1->m_flags & M_EXT)) {
-				m_freem(m);
-				m_freem(m1);
-				return ENOBUFS;
-			}
+			return (ENOBUFS);
 		}
-		m_copydata(m, 0, m->m_pkthdr.len, mtod(m1, void *));
-		m1->m_pkthdr.len = m1->m_len = m->m_pkthdr.len;
-		m_freem(m);
 		m = m1;
+
 		error = bus_dmamap_load_mbuf_sg(ring->data_dmat, data->map, m,
 		    segs, &nsegs, BUS_DMA_NOWAIT);
 		if (error != 0) {