Index: head/sys/dev/iwm/if_iwm.c
===================================================================
--- head/sys/dev/iwm/if_iwm.c
+++ head/sys/dev/iwm/if_iwm.c
@@ -5014,6 +5014,8 @@
 	if (do_net80211)
 		ieee80211_ifdetach(&sc->sc_ic);
 
+	iwm_phy_db_free(sc);
+
 	/* Free descriptor rings */
 	iwm_free_rx_ring(sc, &sc->rxq);
 	for (i = 0; i < nitems(sc->txq); i++)
Index: head/sys/dev/iwm/if_iwm_phy_db.h
===================================================================
--- head/sys/dev/iwm/if_iwm_phy_db.h
+++ head/sys/dev/iwm/if_iwm_phy_db.h
@@ -109,4 +109,5 @@
 extern	int iwm_phy_db_set_section(struct iwm_softc *sc,
 	     struct iwm_calib_res_notif_phy_db *phy_db_notif);
 extern	int iwm_send_phy_db_data(struct iwm_softc *sc);
+extern	void iwm_phy_db_free(struct iwm_softc *sc);
 #endif	/* __IF_IWM_PHY_DB_H__ */
Index: head/sys/dev/iwm/if_iwm_phy_db.c
===================================================================
--- head/sys/dev/iwm/if_iwm_phy_db.c
+++ head/sys/dev/iwm/if_iwm_phy_db.c
@@ -451,3 +451,33 @@
 	    __func__);
 	return 0;
 }
+
+static void
+iwm_phy_db_free_section(struct iwm_softc *sc,
+    enum iwm_phy_db_section_type type, uint16_t chg_id)
+{
+	struct iwm_phy_db_entry *entry =
+	    iwm_phy_db_get_section(sc, type, chg_id);
+	if (!entry)
+		return;
+
+	if (entry->data != NULL)
+		free(entry->data, M_DEVBUF);
+	entry->data = NULL;
+	entry->size = 0;
+}
+
+void
+iwm_phy_db_free(struct iwm_softc *sc)
+{
+	int i;
+
+	iwm_phy_db_free_section(sc, IWM_PHY_DB_CFG, 0);
+	iwm_phy_db_free_section(sc, IWM_PHY_DB_CALIB_NCH, 0);
+
+	for (i = 0; i < IWM_NUM_PAPD_CH_GROUPS; i++)
+		iwm_phy_db_free_section(sc, IWM_PHY_DB_CALIB_CHG_PAPD, i);
+
+	for (i = 0; i < IWM_NUM_TXP_CH_GROUPS; i++)
+		iwm_phy_db_free_section(sc, IWM_PHY_DB_CALIB_CHG_TXP, i);
+}