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Date:      Sun, 21 Dec 2014 01:15:56 +0000 (UTC)
From:      Adrian Chadd <adrian@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r275974 - head/sys/net80211
Message-ID:  <201412210115.sBL1Fuxk076497@svn.freebsd.org>
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Author: adrian
Date: Sun Dec 21 01:15:55 2014
New Revision: 275974
URL: https://svnweb.freebsd.org/changeset/base/275974

Log:
  Add more debugging to try and track down this scan hang nonsense.

Modified:
  head/sys/net80211/ieee80211_scan.c

Modified: head/sys/net80211/ieee80211_scan.c
==============================================================================
--- head/sys/net80211/ieee80211_scan.c	Sat Dec 20 23:41:37 2014	(r275973)
+++ head/sys/net80211/ieee80211_scan.c	Sun Dec 21 01:15:55 2014	(r275974)
@@ -752,6 +752,8 @@ ieee80211_scan_next(struct ieee80211vap 
 	struct ieee80211com *ic = vap->iv_ic;
 	struct ieee80211_scan_state *ss = ic->ic_scan;
 
+	IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__);
+
 	/* wake up the scan task */
 	IEEE80211_LOCK(ic);
 	scan_signal(ss);
@@ -768,6 +770,8 @@ ieee80211_scan_done(struct ieee80211vap 
 	struct ieee80211com *ic = vap->iv_ic;
 	struct ieee80211_scan_state *ss;
 
+	IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__);
+
 	IEEE80211_LOCK(ic);
 	ss = ic->ic_scan;
 	ss->ss_next = ss->ss_last; /* all channels are complete */
@@ -821,6 +825,10 @@ scan_curchan(struct ieee80211_scan_state
 {
 	struct ieee80211vap *vap  = ss->ss_vap;
 
+	IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
+	    "%s: calling; maxdwell=%lu\n",
+	    __func__,
+	    maxdwell);
 	IEEE80211_LOCK(vap->iv_ic);
 	if (ss->ss_flags & IEEE80211_SCAN_ACTIVE)
 		ieee80211_probe_curchan(vap, 0);
@@ -835,7 +843,6 @@ scan_signal(void *arg)
 	struct ieee80211_scan_state *ss = (struct ieee80211_scan_state *) arg;
 
 	IEEE80211_LOCK_ASSERT(ss->ss_ic);
-
 	cv_signal(&SCAN_PRIVATE(ss)->ss_scan_cv);
 }
 
@@ -848,6 +855,8 @@ scan_mindwell(struct ieee80211_scan_stat
 {
 	struct ieee80211com *ic = ss->ss_ic;
 
+	IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__);
+
 	IEEE80211_LOCK(ic);
 	scan_signal(ss);
 	IEEE80211_UNLOCK(ic);
@@ -904,8 +913,15 @@ scan_task(void *arg, int pending)
 	IEEE80211_LOCK(ic);
 
 	for (;;) {
+
 		scandone = (ss->ss_next >= ss->ss_last) ||
 		    (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_CANCEL) != 0;
+
+		IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
+		    "%s: loop start; scandone=%d\n",
+		    __func__,
+		    scandone);
+
 		if (scandone || (ss->ss_flags & IEEE80211_SCAN_GOTPICK) ||
 		    (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT) ||
 		     time_after(ticks + ss->ss_mindwell, scanend))
@@ -970,9 +986,13 @@ scan_task(void *arg, int pending)
 		if ((SCAN_PRIVATE(ss)->ss_iflags & (ISCAN_CANCEL|ISCAN_ABORT)))
 			continue;
 
+		IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: waiting\n", __func__);
 		/* Wait to be signalled to scan the next channel */
 		cv_wait(&SCAN_PRIVATE(ss)->ss_scan_cv, IEEE80211_LOCK_OBJ(ic));
 	}
+
+	IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: out\n", __func__);
+
 	if (SCAN_PRIVATE(ss)->ss_iflags & ISCAN_ABORT)
 		goto done;

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