diff --git a/drivers/atm/he.c b/drivers/atm/he.c
index d369130..dd96123 100644
--- a/drivers/atm/he.c
+++ b/drivers/atm/he.c
@@ -2282,6 +2282,8 @@
 				TPDRQ_MASK(he_readl(he_dev, TPDRQ_B_H)));
 
 		if (new_tail == he_dev->tpdrq_head) {
+			int slot;
+
 			hprintk("tpdrq full (cid 0x%x)\n", cid);
 			/*
 			 * FIXME
@@ -2289,6 +2291,13 @@
 			 * after service_tbrq, service the backlog
 			 * for now, we just drop the pdu
 			 */
+			for (slot = 0; slot < TPD_MAXIOV; ++slot) {
+				if (tpd->iovec[slot].addr)
+					pci_unmap_single(he_dev->pci_dev,
+						tpd->iovec[slot].addr,
+						tpd->iovec[slot].len & TPD_LEN_MASK,
+								PCI_DMA_TODEVICE);
+			}
 			if (tpd->skb) {
 				if (tpd->vcc->pop)
 					tpd->vcc->pop(tpd->vcc, tpd->skb);