package/madwifi/patches/306-mib_intr_workaround.patch

   1 Index: madwifi-ng-r2568-20070710/ath/if_ath.c
   2 ===================================================================
   3 --- madwifi-ng-r2568-20070710.orig/ath/if_ath.c 2007-08-01 11:07:47.882943145 +0200
   4 +++ madwifi-ng-r2568-20070710/ath/if_ath.c      2007-08-01 11:41:11.781138794 +0200
   5 @@ -203,6 +203,7 @@
   6  static void ath_flushrecv(struct ath_softc *);
   7  static void ath_chan_change(struct ath_softc *, struct ieee80211_channel *);
   8  static void ath_calibrate(unsigned long);
   9 +static void ath_mib_enable(unsigned long);
  10  static int ath_newstate(struct ieee80211vap *, enum ieee80211_state, int);
  11
  12  static void ath_scan_start(struct ieee80211com *);
  13 @@ -660,6 +661,10 @@
  14         sc->sc_cal_ch.function = ath_calibrate;
  15         sc->sc_cal_ch.data = (unsigned long) dev;
  16
  17 +       init_timer(&sc->sc_mib_enable);
  18 +       sc->sc_mib_enable.function = ath_mib_enable;
  19 +       sc->sc_mib_enable.data = (unsigned long) sc;
  20 +
  21  #ifdef ATH_SUPERG_DYNTURBO
  22         init_timer(&sc->sc_dturbo_switch_mode);
  23         sc->sc_dturbo_switch_mode.function = ath_turbo_switch_mode;
  24 @@ -1751,16 +1756,19 @@
  25                 if (status & HAL_INT_MIB) {
  26                         sc->sc_stats.ast_mib++;
  27                         /*
  28 -                        * Disable interrupts until we service the MIB
  29 -                        * interrupt; otherwise it will continue to fire.
  30 -                        */
  31 -                       ath_hal_intrset(ah, 0);
  32 -                       /*
  33 -                        * Let the HAL handle the event.  We assume it will
  34 -                        * clear whatever condition caused the interrupt.
  35 +                        * When the card receives lots of PHY errors, the MIB
  36 +                        * interrupt will fire at a very rapid rate. We will use
  37 +                        * a timer to enforce at least 1 jiffy delay between
  38 +                        * MIB interrupts. This should be unproblematic, since
  39 +                        * the hardware will continue to update the counters in the
  40 +                        * mean time.
  41                          */
  42 -                       ath_hal_mibevent(ah, &sc->sc_halstats);
  43 +                       sc->sc_imask &= ~HAL_INT_MIB;
  44                         ath_hal_intrset(ah, sc->sc_imask);
  45 +                       mod_timer(&sc->sc_mib_enable, jiffies + 1);
  46 +
  47 +                       /* Let the HAL handle the event. */
  48 +                       ath_hal_mibevent(ah, &sc->sc_halstats);
  49                 }
  50         }
  51         if (needmark)
  52 @@ -8029,6 +8037,19 @@
  53  }
  54
  55  /*
  56 + * Enable MIB interrupts again, after the ISR disabled them
  57 + * to slow down the rate of PHY error reporting.
  58 + */
  59 +static void
  60 +ath_mib_enable(unsigned long arg)
  61 +{
  62 +       struct ath_softc *sc = (struct ath_softc *) arg;
  63 +
  64 +       sc->sc_imask |= HAL_INT_MIB;
  65 +       ath_hal_intrset(sc->sc_ah, sc->sc_imask);
  66 +}
  67 +
  68 +/*
  69   * Periodically recalibrate the PHY to account
  70   * for temperature/environment changes.
  71   */
  72 Index: madwifi-ng-r2568-20070710/ath/if_athvar.h
  73 ===================================================================
  74 --- madwifi-ng-r2568-20070710.orig/ath/if_athvar.h      2007-08-01 11:33:50.800008711 +0200
  75 +++ madwifi-ng-r2568-20070710/ath/if_athvar.h   2007-08-01 11:34:33.202425088 +0200
  76 @@ -687,6 +687,7 @@
  77         struct ctl_table *sc_sysctls;
  78
  79         u_int16_t sc_reapcount;                 /* # of tx buffers reaped after net dev stopped */
  80 +       struct timer_list sc_mib_enable;
  81
  82  #ifdef ATH_REVERSE_ENGINEERING
  83         u_int8_t register_snapshot[MAX_REGISTER_ADDRESS];