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@@ -0,0 +1,155 @@
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+Index: madwifi-trunk-r3314/ath/if_ath.c
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+===================================================================
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+--- madwifi-trunk-r3314.orig/ath/if_ath.c 2008-02-06 20:27:16.005587752 +0100
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++++ madwifi-trunk-r3314/ath/if_ath.c 2008-02-06 22:06:51.778996341 +0100
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+@@ -395,6 +395,7 @@
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+ static int maxvaps = -1;
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+ static int outdoor = -1;
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+ static int xchanmode = -1;
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++static int beacon_cal = 1;
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+
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+ static const char *hal_status_desc[] = {
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+ "No error",
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+@@ -420,6 +421,7 @@
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+ };
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+
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+ #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,52))
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++MODULE_PARM(beacon_cal, "i");
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+ MODULE_PARM(countrycode, "i");
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+ MODULE_PARM(maxvaps, "i");
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+ MODULE_PARM(outdoor, "i");
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+@@ -432,6 +434,7 @@
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+ MODULE_PARM(ratectl, "s");
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+ #else
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+ #include <linux/moduleparam.h>
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++module_param(beacon_cal, int, 0600);
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+ module_param(countrycode, int, 0600);
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+ module_param(maxvaps, int, 0600);
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+ module_param(outdoor, int, 0600);
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+@@ -2594,7 +2597,8 @@
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+ }
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+ if (!sc->sc_invalid) {
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+ del_timer_sync(&sc->sc_dfs_cac_timer);
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+- del_timer_sync(&sc->sc_cal_ch);
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++ if (!sc->sc_beacon_cal)
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++ del_timer_sync(&sc->sc_cal_ch);
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+ }
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+ ath_draintxq(sc);
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+ if (!sc->sc_invalid) {
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+@@ -2611,6 +2615,20 @@
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+ return 0;
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+ }
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+
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++static void ath_set_beacon_cal(struct ath_softc *sc, int val)
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++{
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++ if (sc->sc_beacon_cal == !!val)
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++ return;
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++
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++ if (val) {
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++ del_timer_sync(&sc->sc_cal_ch);
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++ } else {
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++ sc->sc_cal_ch.expires = jiffies + (ath_calinterval * HZ);
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++ add_timer(&sc->sc_cal_ch);
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++ }
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++ sc->sc_beacon_cal = !!val && beacon_cal;
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++}
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++
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+ /*
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+ * Stop the device, grabbing the top-level lock to protect
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+ * against concurrent entry through ath_init (which can happen
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+@@ -5141,6 +5159,8 @@
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+ "Invoking ath_hal_txstart with sc_bhalq: %d\n",
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+ sc->sc_bhalq);
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+ ath_hal_txstart(ah, sc->sc_bhalq);
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++ if (sc->sc_beacon_cal && (jiffies > sc->sc_lastcal + (ath_calinterval * HZ)))
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++ ath_calibrate((unsigned long) sc->sc_dev);
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+
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+ sc->sc_stats.ast_be_xmit++; /* XXX per-VAP? */
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+ }
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+@@ -5390,6 +5410,7 @@
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+ ath_hal_beacontimers(ah, &bs);
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+ sc->sc_imask |= HAL_INT_BMISS;
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+ ath_hal_intrset(ah, sc->sc_imask);
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++ ath_set_beacon_cal(sc, 0);
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+ } else {
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+ ath_hal_intrset(ah, 0);
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+ if (reset_tsf)
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+@@ -5401,8 +5422,11 @@
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+ */
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+ intval |= HAL_BEACON_ENA;
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+ sc->sc_imask |= HAL_INT_SWBA;
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++ ath_set_beacon_cal(sc, 1);
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+ ath_beaconq_config(sc);
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+- }
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++ } else
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++ ath_set_beacon_cal(sc, 0);
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++
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+ #ifdef ATH_SUPERG_DYNTURBO
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+ ath_beacon_dturbo_config(vap, intval &
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+ ~(HAL_BEACON_RESET_TSF | HAL_BEACON_ENA));
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+@@ -8864,6 +8888,9 @@
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+ /* Enter DFS wait period */
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+ mod_timer(&sc->sc_dfs_cac_timer,
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+ jiffies + (sc->sc_dfs_cac_period * HZ));
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++
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++ /* This is a good time to start a calibration */
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++ ath_set_beacon_cal(sc, 1);
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+ }
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+ /*
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+ * re configure beacons when it is a turbo mode switch.
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+@@ -8973,8 +9000,11 @@
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+ sc->sc_curchan.channel, sc->sc_curchan.channelFlags,
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+ isIQdone ? "done" : "not done");
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+
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+- sc->sc_cal_ch.expires = jiffies + (ath_calinterval * HZ);
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+- add_timer(&sc->sc_cal_ch);
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++ sc->sc_lastcal = jiffies;
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++ if (!sc->sc_beacon_cal) {
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++ sc->sc_cal_ch.expires = jiffies + (ath_calinterval * HZ);
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++ add_timer(&sc->sc_cal_ch);
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++ }
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+ }
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+
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+ static void
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+@@ -9081,7 +9111,8 @@
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+ ieee80211_state_name[vap->iv_state],
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+ ieee80211_state_name[nstate]);
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+
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+- del_timer(&sc->sc_cal_ch); /* periodic calibration timer */
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++ if (!sc->sc_beacon_cal)
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++ del_timer(&sc->sc_cal_ch); /* periodic calibration timer */
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+
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+ ath_hal_setledstate(ah, leds[nstate]); /* set LED */
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+ netif_stop_queue(dev); /* before we do anything else */
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+@@ -9306,7 +9337,8 @@
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+ "VAP -> DFSWAIT_PENDING \n");
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+ /* start calibration timer with a really small value
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+ * 1/10 sec */
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+- mod_timer(&sc->sc_cal_ch, jiffies + (HZ/10));
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++ if (!sc->sc_beacon_cal)
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++ mod_timer(&sc->sc_cal_ch, jiffies + (HZ/10));
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+ /* wake the receiver */
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+ netif_wake_queue(dev);
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+ /* don't do the other usual stuff... */
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+@@ -9349,7 +9381,7 @@
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+ error = avp->av_newstate(vap, nstate, arg);
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+
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+ /* Finally, start any timers. */
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+- if (nstate == IEEE80211_S_RUN) {
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++ if (nstate == IEEE80211_S_RUN && !sc->sc_beacon_cal) {
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+ /* start periodic recalibration timer */
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+ mod_timer(&sc->sc_cal_ch, jiffies + (ath_calinterval * HZ));
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+ }
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+Index: madwifi-trunk-r3314/ath/if_athvar.h
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+===================================================================
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+--- madwifi-trunk-r3314.orig/ath/if_athvar.h 2008-02-06 20:27:08.969186784 +0100
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++++ madwifi-trunk-r3314/ath/if_athvar.h 2008-02-06 20:27:24.670081522 +0100
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+@@ -778,6 +778,8 @@
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+ struct ieee80211vap **sc_bslot; /* beacon xmit slots */
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+ int sc_bnext; /* next slot for beacon xmit */
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+
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++ int sc_beacon_cal; /* use beacon timer for calibration */
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++ u_int64_t sc_lastcal; /* last time the calibration was performed */
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+ struct timer_list sc_cal_ch; /* calibration timer */
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+ HAL_NODE_STATS sc_halstats; /* station-mode rssi stats */
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+
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Felix Fietkau