Index: head/sys/net80211/ieee80211_crypto_tkip.c
===================================================================
--- head/sys/net80211/ieee80211_crypto_tkip.c
+++ head/sys/net80211/ieee80211_crypto_tkip.c
@@ -84,7 +84,6 @@
 	struct ieee80211vap *tc_vap;	/* for diagnostics+statistics */
 
 	u16	tx_ttak[5];
-	int	tx_phase1_done;
 	u8	tx_rc4key[16];		/* XXX for test module; make locals? */
 
 	u16	rx_ttak[5];
@@ -143,7 +142,6 @@
 			__func__, k->wk_keylen, 128/NBBY);
 		return 0;
 	}
-	k->wk_keytsc = 1;		/* TSC starts at 1 */
 	ctx->rx_phase1_done = 0;
 	return 1;
 }
@@ -188,6 +186,7 @@
 
 	keyid = ieee80211_crypto_get_keyid(vap, k) << 6;
 
+	k->wk_keytsc++;
 	ivp[0] = k->wk_keytsc >> 8;		/* TSC1 */
 	ivp[1] = (ivp[0] | 0x20) & 0x7f;	/* WEP seed */
 	ivp[2] = k->wk_keytsc >> 0;		/* TSC0 */
@@ -200,12 +199,9 @@
 	/*
 	 * Finally, do software encrypt if needed.
 	 */
-	if (k->wk_flags & IEEE80211_KEY_SWENCRYPT) {
-		if (!tkip_encrypt(ctx, k, m, hdrlen))
-			return 0;
-		/* NB: tkip_encrypt handles wk_keytsc */
-	} else
-		k->wk_keytsc++;
+	if ((k->wk_flags & IEEE80211_KEY_SWENCRYPT) &&
+	    !tkip_encrypt(ctx, k, m, hdrlen))
+		return 0;
 
 	return 1;
 }
@@ -934,10 +930,9 @@
 	ctx->tc_vap->iv_stats.is_crypto_tkip++;
 
 	wh = mtod(m, struct ieee80211_frame *);
-	if (!ctx->tx_phase1_done) {
+	if ((u16)(key->wk_keytsc) == 0 || key->wk_keytsc == 1) {
 		tkip_mixing_phase1(ctx->tx_ttak, key->wk_key, wh->i_addr2,
 				   (u32)(key->wk_keytsc >> 16));
-		ctx->tx_phase1_done = 1;
 	}
 	tkip_mixing_phase2(ctx->tx_rc4key, key->wk_key, ctx->tx_ttak,
 		(u16) key->wk_keytsc);
@@ -948,9 +943,6 @@
 		icv);
 	(void) m_append(m, IEEE80211_WEP_CRCLEN, icv);	/* XXX check return */
 
-	key->wk_keytsc++;
-	if ((u16)(key->wk_keytsc) == 0)
-		ctx->tx_phase1_done = 0;
 	return 1;
 }