From 5ab0c8434a7befeafbaf81e899fc23f660b64c9d Mon Sep 17 00:00:00 2001
From: Gleb Smirnoff <glebius@FreeBSD.org>
Date: Fri, 24 Jan 2020 17:11:54 +0000
Subject: [PATCH] ath(4) processing input packets in taskqueue.  Enter network
 epoch before calling ieee80211_input_mimo().

---
 sys/dev/ath/if_ath_rx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sys/dev/ath/if_ath_rx.c b/sys/dev/ath/if_ath_rx.c
index 93a1d745519..13a42c5038d 100644
--- a/sys/dev/ath/if_ath_rx.c
+++ b/sys/dev/ath/if_ath_rx.c
@@ -647,6 +647,7 @@ ath_rx_pkt(struct ath_softc *sc, struct ath_rx_status *rs, HAL_STATUS status,
     uint64_t tsf, int nf, HAL_RX_QUEUE qtype, struct ath_buf *bf,
     struct mbuf *m)
 {
+	struct epoch_tracker et;
 	uint64_t rstamp;
 	/* XXX TODO: make this an mbuf tag? */
 	struct ieee80211_rx_stats rxs;
@@ -941,6 +942,7 @@ rx_accept:
 		rxs.c_nf_ext[i] = nf;
 	}
 
+	NET_EPOCH_ENTER(et);
 	if (ni != NULL) {
 		/*
 		 * Only punt packets for ampdu reorder processing for
@@ -986,6 +988,7 @@ rx_accept:
 		type = ieee80211_input_mimo_all(ic, m);
 		m = NULL;
 	}
+	NET_EPOCH_EXIT(et);
 
 	/*
 	 * At this point we have passed the frame up the stack; thus