From fbc9d202d8476261f9242a92c7be7414194b9115 Mon Sep 17 00:00:00 2001
From: Andriy Voskoboinyk <avos@FreeBSD.org>
Date: Sun, 25 Sep 2016 19:13:07 +0000
Subject: [PATCH] rsu: do not restart calibration task when going out of RUN
 state.

Clear 'sc_calibrating' flag and stop calibration task when interface
is not associated; this fixes possible panic after detach.

Reported and tested by:	hselasky
Reviewed by:	adrian
MFC after:	6 days
---
 sys/dev/usb/wlan/if_rsu.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/sys/dev/usb/wlan/if_rsu.c b/sys/dev/usb/wlan/if_rsu.c
index c08b4af5dc74..4ee9decf4e2b 100644
--- a/sys/dev/usb/wlan/if_rsu.c
+++ b/sys/dev/usb/wlan/if_rsu.c
@@ -1270,9 +1270,12 @@ rsu_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
 	default:
 		break;
 	}
-	sc->sc_calibrating = 1;
-	/* Start periodic calibration. */
-	taskqueue_enqueue_timeout(taskqueue_thread, &sc->calib_task, hz);
+	if (startcal != 0) {
+		sc->sc_calibrating = 1;
+		/* Start periodic calibration. */
+		taskqueue_enqueue_timeout(taskqueue_thread, &sc->calib_task,
+		    hz);
+	}
 	RSU_UNLOCK(sc);
 	IEEE80211_LOCK(ic);
 	return (uvp->newstate(vap, nstate, arg));