ath9k: Scrub beacon.c

Remove useless comments, fix indentation.
Also, remove all occurrences of ASSERT(vif) which are not needed.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 53 insertions, 124 deletions

diff --git a/drivers/net/wireless/ath9k/beacon.c b/drivers/net/wireless/ath9k/beacon.c
index 18bda362d3ab..c3044891a935 100644
--- a/drivers/net/wireless/ath9k/beacon.c
+++ b/drivers/net/wireless/ath9k/beacon.c
@@ -44,15 +44,14 @@ static int ath_beaconq_config(struct ath_softc *sc)
                         "unable to update h/w beacon queue parameters\n");
                 return 0;
         } else {
-                ath9k_hw_resettxqueue(ah, sc->beacon.beaconq); /* push to h/w */
+                ath9k_hw_resettxqueue(ah, sc->beacon.beaconq);
                 return 1;
         }
 }
 
 static void ath_bstuck_process(struct ath_softc *sc)
 {
-        DPRINTF(sc, ATH_DBG_BEACON,
-                "stuck beacon; resetting (bmiss count %u)\n",
+        DPRINTF(sc, ATH_DBG_BEACON, "stuck beacon; resetting (bmiss count %u)\n",
                 sc->beacon.bmisscnt);
         ath_reset(sc, false);
 }
@@ -62,24 +61,18 @@ static void ath_bstuck_process(struct ath_softc *sc)
  *  up all required antenna switch parameters, rate codes, and channel flags.
  *  Beacons are always sent out at the lowest rate, and are not retried.
 */
-static void ath_beacon_setup(struct ath_softc *sc,
-                             struct ath_vif *avp, struct ath_buf *bf)
+static void ath_beacon_setup(struct ath_softc *sc, struct ath_vif *avp,
+                             struct ath_buf *bf)
 {
         struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu;
         struct ath_hw *ah = sc->sc_ah;
         struct ath_desc *ds;
         struct ath9k_11n_rate_series series[4];
         struct ath_rate_table *rt;
-        int flags, antenna;
-        u8 rix, rate;
-        int ctsrate = 0;
-        int ctsduration = 0;
-
-        DPRINTF(sc, ATH_DBG_BEACON, "m %p len %u\n", skb, skb->len);
+        int flags, antenna, ctsrate = 0, ctsduration = 0;
+        u8 rate;
 
-        /* setup descriptors */
         ds = bf->bf_desc;
-
         flags = ATH9K_TXDESC_NOACK;
 
         if (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC &&
@@ -92,53 +85,39 @@ static void ath_beacon_setup(struct ath_softc *sc,
                 ds->ds_link = 0;
                 /*
                  * Switch antenna every beacon.
-                 * Should only switch every beacon period, not for every
-                 * SWBA's
-                 * XXX assumes two antenna
+                 * Should only switch every beacon period, not for every SWBA
+                 * XXX assumes two antennae
                  */
                 antenna = ((sc->beacon.ast_be_xmit / sc->nbcnvifs) & 1 ? 2 : 1);
         }
 
         ds->ds_data = bf->bf_buf_addr;
 
-        /*
-         * Calculate rate code.
-         * XXX everything at min xmit rate
-         */
-        rix = 0;
         rt = sc->cur_rate_table;
-        rate = rt->info[rix].ratecode;
+        rate = rt->info[0].ratecode;
         if (sc->sc_flags & SC_OP_PREAMBLE_SHORT)
-                rate |= rt->info[rix].short_preamble;
-
-        ath9k_hw_set11n_txdesc(ah, ds,
-                               skb->len + FCS_LEN,     /* frame length */
-                               ATH9K_PKT_TYPE_BEACON,  /* Atheros packet type */
-                               MAX_RATE_POWER,         /* FIXME */
-                               ATH9K_TXKEYIX_INVALID,  /* no encryption */
-                               ATH9K_KEY_TYPE_CLEAR,   /* no encryption */
-                               flags                   /* no ack,
-                                                          veol for beacons */
-                );
+                rate |= rt->info[0].short_preamble;
+
+        ath9k_hw_set11n_txdesc(ah, ds, skb->len + FCS_LEN,
+                               ATH9K_PKT_TYPE_BEACON,
+                               MAX_RATE_POWER,
+                               ATH9K_TXKEYIX_INVALID,
+                               ATH9K_KEY_TYPE_CLEAR,
+                               flags);
 
         /* NB: beacon's BufLen must be a multiple of 4 bytes */
-        ath9k_hw_filltxdesc(ah, ds,
-                            roundup(skb->len, 4), /* buffer length */
-                            true,                 /* first segment */
-                            true,                 /* last segment */
-                            ds                    /* first descriptor */
-                );
+        ath9k_hw_filltxdesc(ah, ds, roundup(skb->len, 4),
+                            true, true, ds);
 
         memset(series, 0, sizeof(struct ath9k_11n_rate_series) * 4);
         series[0].Tries = 1;
         series[0].Rate = rate;
         series[0].ChSel = sc->tx_chainmask;
         series[0].RateFlags = (ctsrate) ? ATH9K_RATESERIES_RTS_CTS : 0;
-        ath9k_hw_set11n_ratescenario(ah, ds, ds, 0,
-                ctsrate, ctsduration, series, 4, 0);
+        ath9k_hw_set11n_ratescenario(ah, ds, ds, 0, ctsrate, ctsduration,
+                                     series, 4, 0);
 }
 
-/* Generate beacon frame and queue cab data for a VIF */
 static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id)
 {
         struct ath_buf *bf;
@@ -150,8 +129,6 @@ static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id)
         int cabq_depth;
 
         vif = sc->vifs[if_id];
-        ASSERT(vif);
-
         avp = (void *)vif->drv_priv;
         cabq = sc->beacon.cabq;
 
@@ -161,15 +138,18 @@ static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id)
                 return NULL;
         }
 
+        /* Release the old beacon first */
+
         bf = avp->av_bcbuf;
         skb = (struct sk_buff *)bf->bf_mpdu;
         if (skb) {
                 dma_unmap_single(sc->dev, bf->bf_dmacontext,
-                                 skb->len,
-                                 DMA_TO_DEVICE);
+                                 skb->len, DMA_TO_DEVICE);
                 dev_kfree_skb_any(skb);
         }
 
+        /* Get a new beacon from mac80211 */
+
         skb = ieee80211_beacon_get(sc->hw, vif);
         bf->bf_mpdu = skb;
         if (skb == NULL)
@@ -189,13 +169,11 @@ static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id)
 
         bf->bf_buf_addr = bf->bf_dmacontext =
                 dma_map_single(sc->dev, skb->data,
-                               skb->len,
-                               DMA_TO_DEVICE);
+                               skb->len, DMA_TO_DEVICE);
         if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
                 dev_kfree_skb_any(skb);
                 bf->bf_mpdu = NULL;
-                DPRINTF(sc, ATH_DBG_CONFIG,
-                        "dma_mapping_error() on beaconing\n");
+                DPRINTF(sc, ATH_DBG_FATAL, "dma_mapping_error on beaconing\n");
                 return NULL;
         }
 
@@ -214,25 +192,15 @@ static struct ath_buf *ath_beacon_generate(struct ath_softc *sc, int if_id)
         spin_unlock_bh(&cabq->axq_lock);
 
         if (skb && cabq_depth) {
-                /*
-                 * Unlock the cabq lock as ath_tx_draintxq acquires
-                 * the lock again which is a common function and that
-                 * acquires txq lock inside.
-                 */
                 if (sc->nvifs > 1) {
-                        ath_draintxq(sc, cabq, false);
                         DPRINTF(sc, ATH_DBG_BEACON,
-                                "flush previous cabq traffic\n");
+                                "Flushing previous cabq traffic\n");
+                        ath_draintxq(sc, cabq, false);
                 }
         }
 
-        /* Construct tx descriptor. */
         ath_beacon_setup(sc, avp, bf);
 
-        /*
-         * Enable the CAB queue before the beacon queue to
-         * insure cab frames are triggered by this beacon.
-         */
         while (skb) {
                 ath_tx_cabq(sc, skb);
                 skb = ieee80211_get_buffered_bc(sc->hw, vif);
@@ -254,19 +222,14 @@ static void ath_beacon_start_adhoc(struct ath_softc *sc, int if_id)
         struct sk_buff *skb;
 
         vif = sc->vifs[if_id];
-        ASSERT(vif);
-
         avp = (void *)vif->drv_priv;
 
-        if (avp->av_bcbuf == NULL) {
-                DPRINTF(sc, ATH_DBG_BEACON, "avp=%p av_bcbuf=%p\n",
-                        avp, avp != NULL ? avp->av_bcbuf : NULL);
+        if (avp->av_bcbuf == NULL)
                 return;
-        }
+
         bf = avp->av_bcbuf;
         skb = (struct sk_buff *) bf->bf_mpdu;
 
-        /* Construct tx descriptor. */
         ath_beacon_setup(sc, avp, bf);
 
         /* NB: caller is known to have already stopped tx dma */
@@ -298,8 +261,6 @@ int ath_beacon_alloc(struct ath_softc *sc, int if_id)
         __le64 tstamp;
 
         vif = sc->vifs[if_id];
-        ASSERT(vif);
-
         avp = (void *)vif->drv_priv;
 
         /* Allocate a beacon descriptor if we haven't done so. */
@@ -339,22 +300,17 @@ int ath_beacon_alloc(struct ath_softc *sc, int if_id)
                 }
         }
 
-        /* release the previous beacon frame , if it already exists. */
+        /* release the previous beacon frame, if it already exists. */
         bf = avp->av_bcbuf;
         if (bf->bf_mpdu != NULL) {
                 skb = (struct sk_buff *)bf->bf_mpdu;
                 dma_unmap_single(sc->dev, bf->bf_dmacontext,
-                                 skb->len,
-                                 DMA_TO_DEVICE);
+                                 skb->len, DMA_TO_DEVICE);
                 dev_kfree_skb_any(skb);
                 bf->bf_mpdu = NULL;
         }
 
-        /*
-         * NB: the beacon data buffer must be 32-bit aligned.
-         * FIXME: Fill avp->av_btxctl.txpower and
-         * avp->av_btxctl.shortPreamble
-         */
+        /* NB: the beacon data buffer must be 32-bit aligned. */
         skb = ieee80211_beacon_get(sc->hw, vif);
         if (skb == NULL) {
                 DPRINTF(sc, ATH_DBG_BEACON, "cannot get skb\n");
@@ -403,13 +359,12 @@ int ath_beacon_alloc(struct ath_softc *sc, int if_id)
         bf->bf_mpdu = skb;
         bf->bf_buf_addr = bf->bf_dmacontext =
                 dma_map_single(sc->dev, skb->data,
-                               skb->len,
-                               DMA_TO_DEVICE);
+                               skb->len, DMA_TO_DEVICE);
         if (unlikely(dma_mapping_error(sc->dev, bf->bf_buf_addr))) {
                 dev_kfree_skb_any(skb);
                 bf->bf_mpdu = NULL;
-                DPRINTF(sc, ATH_DBG_CONFIG,
-                        "dma_mapping_error() on beacon alloc\n");
+                DPRINTF(sc, ATH_DBG_FATAL,
+                        "dma_mapping_error on beacon alloc\n");
                 return -ENOMEM;
         }
 
@@ -430,8 +385,7 @@ void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
                 if (bf->bf_mpdu != NULL) {
                         struct sk_buff *skb = (struct sk_buff *)bf->bf_mpdu;
                         dma_unmap_single(sc->dev, bf->bf_dmacontext,
-                                         skb->len,
-                                         DMA_TO_DEVICE);
+                                         skb->len, DMA_TO_DEVICE);
                         dev_kfree_skb_any(skb);
                         bf->bf_mpdu = NULL;
                 }
@@ -441,18 +395,15 @@ void ath_beacon_return(struct ath_softc *sc, struct ath_vif *avp)
         }
 }
 
-void ath9k_beacon_tasklet(unsigned long data)
+void ath_beacon_tasklet(unsigned long data)
 {
         struct ath_softc *sc = (struct ath_softc *)data;
         struct ath_hw *ah = sc->sc_ah;
         struct ath_buf *bf = NULL;
         int slot, if_id;
-        u32 bfaddr;
+        u32 bfaddr, show_cycles = 0, bc = 0, tsftu;
         u32 rx_clear = 0, rx_frame = 0, tx_frame = 0;
-        u32 show_cycles = 0;
-        u32 bc = 0; /* beacon count */
         u64 tsf;
-        u32 tsftu;
         u16 intval;
 
         if (sc->sc_flags & SC_OP_NO_RESET) {
@@ -627,7 +578,6 @@ void ath_beacon_config(struct ath_softc *sc, int if_id)
 
         if (if_id != ATH_IF_ID_ANY) {
                 vif = sc->vifs[if_id];
-                ASSERT(vif);
                 avp = (void *)vif->drv_priv;
                 opmode = avp->av_opmode;
         } else {
@@ -757,30 +707,11 @@ void ath_beacon_config(struct ath_softc *sc, int if_id)
                 bs.bs_tsfoor_threshold = ATH9K_TSFOOR_THRESHOLD;
 
                 DPRINTF(sc, ATH_DBG_BEACON,
-                        "tsf %llu "
-                        "tsf:tu %u "
-                        "intval %u "
-                        "nexttbtt %u "
-                        "dtim %u "
-                        "nextdtim %u "
-                        "bmiss %u "
-                        "sleep %u "
-                        "cfp:period %u "
-                        "maxdur %u "
-                        "next %u "
-                        "timoffset %u\n",
-                        (unsigned long long)tsf, tsftu,
-                        bs.bs_intval,
-                        bs.bs_nexttbtt,
-                        bs.bs_dtimperiod,
-                        bs.bs_nextdtim,
-                        bs.bs_bmissthreshold,
-                        bs.bs_sleepduration,
-                        bs.bs_cfpperiod,
-                        bs.bs_cfpmaxduration,
-                        bs.bs_cfpnext,
-                        bs.bs_timoffset
-                        );
+                        "tsf: %llu tsftu: %u\n", tsf, tsftu);
+                DPRINTF(sc, ATH_DBG_BEACON,
+                        "bmiss: %u sleep: %u cfp-period: %u maxdur: %u next: %u\n",
+                        bs.bs_bmissthreshold, bs.bs_sleepduration,
+                        bs.bs_cfpperiod, bs.bs_cfpmaxduration, bs.bs_cfpnext);
 
                 ath9k_hw_set_interrupts(ah, 0);
                 ath9k_hw_set_sta_beacon_timers(ah, &bs);
@@ -789,17 +720,15 @@ void ath_beacon_config(struct ath_softc *sc, int if_id)
         } else {
                 u64 tsf;
                 u32 tsftu;
+
                 ath9k_hw_set_interrupts(ah, 0);
                 if (sc->sc_ah->opmode == NL80211_IFTYPE_ADHOC) {
-                        /*
-                         * Pull nexttbtt forward to reflect the current
-                         * TSF
-                         */
+                        /* Pull nexttbtt forward to reflect the current TSF */
 #define FUDGE 2
                         if (!(intval & ATH9K_BEACON_RESET_TSF)) {
                                 tsf = ath9k_hw_gettsf64(ah);
                                 tsftu = TSF_TO_TU((u32)(tsf>>32),
-                                        (u32)tsf) + FUDGE;
+                                                  (u32)tsf) + FUDGE;
                                 do {
                                         nexttbtt += intval;
                                 } while (nexttbtt < tsftu);
@@ -807,8 +736,7 @@ void ath_beacon_config(struct ath_softc *sc, int if_id)
 #undef FUDGE
                         DPRINTF(sc, ATH_DBG_BEACON,
                                 "IBSS nexttbtt %u intval %u (%u)\n",
-                                nexttbtt,
-                                intval & ~ATH9K_BEACON_RESET_TSF,
+                                nexttbtt, intval & ~ATH9K_BEACON_RESET_TSF,
                                 conf.beacon_interval);
 
                         /*
@@ -825,18 +753,19 @@ void ath_beacon_config(struct ath_softc *sc, int if_id)
                 } else if (sc->sc_ah->opmode == NL80211_IFTYPE_AP) {
                         if (nexttbtt == intval)
                                 intval |= ATH9K_BEACON_RESET_TSF;
-
                         /*
                          * In AP mode we enable the beacon timers and
                          * SWBA interrupts to prepare beacon frames.
                          */
                         intval |= ATH9K_BEACON_ENA;
-                        sc->imask |= ATH9K_INT_SWBA;   /* beacon prepare */
+                        sc->imask |= ATH9K_INT_SWBA;
                         ath_beaconq_config(sc);
                 }
+
                 ath9k_hw_beaconinit(ah, nexttbtt, intval);
                 sc->beacon.bmisscnt = 0;
                 ath9k_hw_set_interrupts(ah, sc->imask);
+
                 /*
                  * When using a self-linked beacon descriptor in
                  * ibss mode load it once here.