ath9k: change DFS logging to use ath_dbg()

The DFS pattern detector was initially planned to reside on
a higher layer and used generic pr_*() logging functions.

Being part of ath9k, use ath_dbg() instead and make DFS log
ouput selectable via ATH_DBG_DFS (0x20000) at runtime.

This patch does not contain functional modifications.

Signed-off-by: Zefir Kurtisi <zefir.kurtisi@neratec.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

6 files changed, 63 insertions, 67 deletions

diff --git a/drivers/net/wireless/ath/ath9k/dfs.c b/drivers/net/wireless/ath/ath9k/dfs.c
index 508f8b33f0ef..7187d3671512 100644
--- a/drivers/net/wireless/ath/ath9k/dfs.c
+++ b/drivers/net/wireless/ath/ath9k/dfs.c
@@ -55,12 +55,6 @@ ath9k_postprocess_radar_event(struct ath_softc *sc,
         u8 rssi;
         u16 dur;
 
-        ath_dbg(ath9k_hw_common(sc->sc_ah), DFS,
-                "pulse_bw_info=0x%x, pri,ext len/rssi=(%u/%u, %u/%u)\n",
-                ard->pulse_bw_info,
-                ard->pulse_length_pri, ard->rssi,
-                ard->pulse_length_ext, ard->ext_rssi);
-
         /*
          * Only the last 2 bits of the BW info are relevant, they indicate
          * which channel the radar was detected in.
diff --git a/drivers/net/wireless/ath/ath9k/dfs_pattern_detector.c b/drivers/net/wireless/ath/ath9k/dfs_pattern_detector.c
index 467b60014b7b..18413123efd7 100644
--- a/drivers/net/wireless/ath/ath9k/dfs_pattern_detector.c
+++ b/drivers/net/wireless/ath/ath9k/dfs_pattern_detector.c
@@ -19,6 +19,7 @@
 
 #include "dfs_pattern_detector.h"
 #include "dfs_pri_detector.h"
+#include "ath9k.h"
 
 /*
  * tolerated deviation of radar time stamp in usecs on both sides
@@ -142,6 +143,7 @@ channel_detector_create(struct dfs_pattern_detector *dpd, u16 freq)
 {
         u32 sz, i;
         struct channel_detector *cd;
+        struct ath_common *common = ath9k_hw_common(dpd->ah);
 
         cd = kmalloc(sizeof(*cd), GFP_KERNEL);
         if (cd == NULL)
@@ -165,7 +167,8 @@ channel_detector_create(struct dfs_pattern_detector *dpd, u16 freq)
         return cd;
 
 fail:
-        pr_err("failed to allocate channel_detector for freq=%d\n", freq);
+        ath_dbg(common, DFS,
+                "failed to allocate channel_detector for freq=%d\n", freq);
         channel_detector_exit(dpd, cd);
         return NULL;
 }
@@ -216,34 +219,34 @@ static bool
 dpd_add_pulse(struct dfs_pattern_detector *dpd, struct pulse_event *event)
 {
         u32 i;
-        bool ts_wraparound;
         struct channel_detector *cd;
 
-        if (dpd->region == NL80211_DFS_UNSET) {
-                /*
-                 * pulses received for a non-supported or un-initialized
-                 * domain are treated as detected radars
-                 */
+        /*
+         * pulses received for a non-supported or un-initialized
+         * domain are treated as detected radars for fail-safety
+         */
+        if (dpd->region == NL80211_DFS_UNSET)
                 return true;
-        }
 
         cd = channel_detector_get(dpd, event->freq);
         if (cd == NULL)
                 return false;
 
-        ts_wraparound = (event->ts < dpd->last_pulse_ts);
         dpd->last_pulse_ts = event->ts;
-        if (ts_wraparound) {
-                /*
-                 * reset detector on time stamp wraparound
-                 * with monotonic time stamps, this should never happen
-                 */
-                pr_warn("DFS: time stamp wraparound detected, resetting\n");
+        /* reset detector on time stamp wraparound, caused by TSF reset */
+        if (event->ts < dpd->last_pulse_ts)
                 dpd_reset(dpd);
-        }
+
         /* do type individual pattern matching */
         for (i = 0; i < dpd->num_radar_types; i++) {
-                if (cd->detectors[i]->add_pulse(cd->detectors[i], event) != 0) {
+                struct pri_detector *pd = cd->detectors[i];
+                struct pri_sequence *ps = pd->add_pulse(pd, event);
+                if (ps != NULL) {
+                        ath_dbg(ath9k_hw_common(dpd->ah), DFS,
+                                "DFS: radar found on freq=%d: id=%d, pri=%d, "
+                                "count=%d, count_false=%d\n",
+                                event->freq, pd->rs->type_id,
+                                ps->pri, ps->count, ps->count_falses);
                         channel_detector_reset(dpd, cd);
                         return true;
                 }
@@ -285,9 +288,10 @@ static struct dfs_pattern_detector default_dpd = {
 };
 
 struct dfs_pattern_detector *
-dfs_pattern_detector_init(enum nl80211_dfs_regions region)
+dfs_pattern_detector_init(struct ath_hw *ah, enum nl80211_dfs_regions region)
 {
         struct dfs_pattern_detector *dpd;
+        struct ath_common *common = ath9k_hw_common(ah);
 
         dpd = kmalloc(sizeof(*dpd), GFP_KERNEL);
         if (dpd == NULL)
@@ -296,10 +300,11 @@ dfs_pattern_detector_init(enum nl80211_dfs_regions region)
         *dpd = default_dpd;
         INIT_LIST_HEAD(&dpd->channel_detectors);
 
+        dpd->ah = ah;
         if (dpd->set_dfs_domain(dpd, region))
                 return dpd;
 
-        pr_err("Could not set DFS domain to %d. ", region);
+        ath_dbg(common, DFS,"Could not set DFS domain to %d", region);
         kfree(dpd);
         return NULL;
 }
diff --git a/drivers/net/wireless/ath/ath9k/dfs_pattern_detector.h b/drivers/net/wireless/ath/ath9k/dfs_pattern_detector.h
index cda52f39f28a..90a5abcc4265 100644
--- a/drivers/net/wireless/ath/ath9k/dfs_pattern_detector.h
+++ b/drivers/net/wireless/ath/ath9k/dfs_pattern_detector.h
@@ -80,6 +80,8 @@ struct dfs_pattern_detector {
         enum nl80211_dfs_regions region;
         u8 num_radar_types;
         u64 last_pulse_ts;
+        /* needed for ath_dbg() */
+        struct ath_hw *ah;
 
         const struct radar_detector_specs *radar_spec;
         struct list_head channel_detectors;
@@ -92,10 +94,10 @@ struct dfs_pattern_detector {
  */
 #if defined(CONFIG_ATH9K_DFS_CERTIFIED)
 extern struct dfs_pattern_detector *
-dfs_pattern_detector_init(enum nl80211_dfs_regions region);
+dfs_pattern_detector_init(struct ath_hw *ah, enum nl80211_dfs_regions region);
 #else
 static inline struct dfs_pattern_detector *
-dfs_pattern_detector_init(enum nl80211_dfs_regions region)
+dfs_pattern_detector_init(struct ath_hw *ah, enum nl80211_dfs_regions region)
 {
         return NULL;
 }
diff --git a/drivers/net/wireless/ath/ath9k/dfs_pri_detector.c b/drivers/net/wireless/ath/ath9k/dfs_pri_detector.c
index 91b8dceeadb1..b3e7cf2da222 100644
--- a/drivers/net/wireless/ath/ath9k/dfs_pri_detector.c
+++ b/drivers/net/wireless/ath/ath9k/dfs_pri_detector.c
@@ -23,28 +23,6 @@
 #include "dfs_debug.h"
 
 /**
- * struct pri_sequence - sequence of pulses matching one PRI
- * @head: list_head
- * @pri: pulse repetition interval (PRI) in usecs
- * @dur: duration of sequence in usecs
- * @count: number of pulses in this sequence
- * @count_falses: number of not matching pulses in this sequence
- * @first_ts: time stamp of first pulse in usecs
- * @last_ts: time stamp of last pulse in usecs
- * @deadline_ts: deadline when this sequence becomes invalid (first_ts + dur)
- */
-struct pri_sequence {
-        struct list_head head;
-        u32 pri;
-        u32 dur;
-        u32 count;
-        u32 count_falses;
-        u64 first_ts;
-        u64 last_ts;
-        u64 deadline_ts;
-};
-
-/**
  * struct pulse_elem - elements in pulse queue
  * @ts: time stamp in usecs
  */
@@ -393,8 +371,8 @@ static void pri_detector_exit(struct pri_detector *de)
         kfree(de);
 }
 
-static bool pri_detector_add_pulse(struct pri_detector *de,
-                                   struct pulse_event *event)
+static struct pri_sequence *pri_detector_add_pulse(struct pri_detector *de,
+                                                   struct pulse_event *event)
 {
         u32 max_updated_seq;
         struct pri_sequence *ps;
@@ -403,35 +381,29 @@ static bool pri_detector_add_pulse(struct pri_detector *de,
 
         /* ignore pulses not within width range */
         if ((rs->width_min > event->width) || (rs->width_max < event->width))
-                return false;
+                return NULL;
 
         if ((ts - de->last_ts) < rs->max_pri_tolerance)
                 /* if delta to last pulse is too short, don't use this pulse */
-                return false;
+                return NULL;
         de->last_ts = ts;
 
         max_updated_seq = pseq_handler_add_to_existing_seqs(de, ts);
 
         if (!pseq_handler_create_sequences(de, ts, max_updated_seq)) {
-                pr_err("failed to create pulse sequences\n");
                 pri_detector_reset(de, ts);
                 return false;
         }
 
         ps = pseq_handler_check_detection(de);
 
-        if (ps != NULL) {
-                pr_info("DFS: radar found: pri=%d, count=%d, count_false=%d\n",
-                         ps->pri, ps->count, ps->count_falses);
-                pri_detector_reset(de, ts);
-                return true;
-        }
-        pulse_queue_enqueue(de, ts);
-        return false;
+        if (ps == NULL)
+                pulse_queue_enqueue(de, ts);
+
+        return ps;
 }
 
-struct pri_detector *
-pri_detector_init(const struct radar_detector_specs *rs)
+struct pri_detector *pri_detector_init(const struct radar_detector_specs *rs)
 {
         struct pri_detector *de;
         de = kzalloc(sizeof(*de), GFP_KERNEL);
diff --git a/drivers/net/wireless/ath/ath9k/dfs_pri_detector.h b/drivers/net/wireless/ath/ath9k/dfs_pri_detector.h
index 81cde9f28e44..723962d1abc6 100644
--- a/drivers/net/wireless/ath/ath9k/dfs_pri_detector.h
+++ b/drivers/net/wireless/ath/ath9k/dfs_pri_detector.h
@@ -20,9 +20,31 @@
 #include <linux/list.h>
 
 /**
+ * struct pri_sequence - sequence of pulses matching one PRI
+ * @head: list_head
+ * @pri: pulse repetition interval (PRI) in usecs
+ * @dur: duration of sequence in usecs
+ * @count: number of pulses in this sequence
+ * @count_falses: number of not matching pulses in this sequence
+ * @first_ts: time stamp of first pulse in usecs
+ * @last_ts: time stamp of last pulse in usecs
+ * @deadline_ts: deadline when this sequence becomes invalid (first_ts + dur)
+ */
+struct pri_sequence {
+        struct list_head head;
+        u32 pri;
+        u32 dur;
+        u32 count;
+        u32 count_falses;
+        u64 first_ts;
+        u64 last_ts;
+        u64 deadline_ts;
+};
+
+/**
  * struct pri_detector - PRI detector element for a dedicated radar type
  * @exit(): destructor
- * @add_pulse(): add pulse event, returns true if pattern was detected
+ * @add_pulse(): add pulse event, returns pri_sequence if pattern was detected
  * @reset(): clear states and reset to given time stamp
  * @rs: detector specs for this detector element
  * @last_ts: last pulse time stamp considered for this element in usecs
@@ -34,7 +56,8 @@
  */
 struct pri_detector {
         void (*exit)     (struct pri_detector *de);
-        bool (*add_pulse)(struct pri_detector *de, struct pulse_event *e);
+        struct pri_sequence *
+             (*add_pulse)(struct pri_detector *de, struct pulse_event *e);
         void (*reset)    (struct pri_detector *de, u64 ts);
 
 /* private: internal use only */
diff --git a/drivers/net/wireless/ath/ath9k/init.c b/drivers/net/wireless/ath/ath9k/init.c
index 3be2eb0da84a..6b275e0864b0 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -577,7 +577,7 @@ static int ath9k_init_softc(u16 devid, struct ath_softc *sc,
         atomic_set(&ah->intr_ref_cnt, -1);
         sc->sc_ah = ah;
 
-        sc->dfs_detector = dfs_pattern_detector_init(NL80211_DFS_UNSET);
+        sc->dfs_detector = dfs_pattern_detector_init(ah, NL80211_DFS_UNSET);
 
         if (!pdata) {
                 ah->ah_flags |= AH_USE_EEPROM;