[PATCH v2 12/13] ath9k: MCC, print time elapsed between events

[Janusz Dziedzic]

This is useful for MCC debugging and bug fixing.

Signed-off-by: Janusz Dziedzic <janusz.dzied...@tieto.com>
---
 drivers/net/wireless/ath/ath9k/ath9k.h   |  1 +
 drivers/net/wireless/ath/ath9k/channel.c | 19 +++++++++++++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/ath9k/ath9k.h 
b/drivers/net/wireless/ath/ath9k/ath9k.h
index 4616229..952a467 100644
--- a/drivers/net/wireless/ath/ath9k/ath9k.h
+++ b/drivers/net/wireless/ath/ath9k/ath9k.h
@@ -983,6 +983,7 @@ struct ath_softc {
        struct ath_offchannel offchannel;
        struct ath_chanctx *next_chan;
        struct completion go_beacon;
+       struct timespec last_event_time;
 #endif
 
        unsigned long driver_data;
diff --git a/drivers/net/wireless/ath/ath9k/channel.c 
b/drivers/net/wireless/ath/ath9k/channel.c
index 8ab856c..65ad7be 100644
--- a/drivers/net/wireless/ath/ath9k/channel.c
+++ b/drivers/net/wireless/ath/ath9k/channel.c
@@ -226,6 +226,20 @@ static const char *chanctx_state_string(enum 
ath_chanctx_state state)
        }
 }
 
+static const u32 chanctx_event_delta(struct ath_softc *sc)
+{
+       u64 ms;
+       struct timespec ts, *old;
+
+       getrawmonotonic(&ts);
+       old = &sc->last_event_time;
+       ms = ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
+       ms -= old->tv_sec * 1000 + old->tv_nsec / 1000000;
+       sc->last_event_time = ts;
+
+       return (u32)ms;
+}
+
 void ath_chanctx_check_active(struct ath_softc *sc, struct ath_chanctx *ctx)
 {
        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
@@ -507,10 +521,11 @@ void ath_chanctx_event(struct ath_softc *sc, struct 
ieee80211_vif *vif,
 
        spin_lock_bh(&sc->chan_lock);
 
-       ath_dbg(common, CHAN_CTX, "cur_chan: %d MHz, event: %s, state: %s\n",
+       ath_dbg(common, CHAN_CTX, "cur_chan: %d MHz, event: %s, state: %s, 
delta: %u ms\n",
                sc->cur_chan->chandef.center_freq1,
                chanctx_event_string(ev),
-               chanctx_state_string(sc->sched.state));
+               chanctx_state_string(sc->sched.state),
+               chanctx_event_delta(sc));
 
        switch (ev) {
        case ATH_CHANCTX_EVENT_BEACON_PREPARE:
-- 
1.9.1

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