From bf5e39f7a718dcbe21af5ca349c30855f3301555 Mon Sep 17 00:00:00 2001
From: Andriy Voskoboinyk <avos@FreeBSD.org>
Date: Mon, 12 Sep 2016 16:46:14 +0000
Subject: [PATCH] urtwn: fix possible driver hang when beacon miss is detected.

---
 sys/dev/urtwn/if_urtwn.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sys/dev/urtwn/if_urtwn.c b/sys/dev/urtwn/if_urtwn.c
index 72f3e67e0e16..d4bd95c7d4a8 100644
--- a/sys/dev/urtwn/if_urtwn.c
+++ b/sys/dev/urtwn/if_urtwn.c
@@ -5628,8 +5628,11 @@ urtwn_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
 	callout_reset(&sc->sc_watchdog_ch, hz, urtwn_watchdog, sc);
 
 end:
-	if (error != 0)
+	if (error != 0) {
+		if (m->m_flags & M_TXCB)
+			ieee80211_process_callback(ni, m, 1);
 		m_freem(m);
+	}
 
 	URTWN_UNLOCK(sc);