Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1].
[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200727193520.GA832@embeddedor
        case 0x5:
                REG_SET_BIT(ah, AR_PHY_ANALOG_SWAP,
                            AR_PHY_SWAP_ALT_CHAIN);
-               /* fall through */
+               fallthrough;
        case 0x3:
                if (ah->hw_version.macVersion == AR_SREV_REVISION_5416_10) {
                        REG_WRITE(ah, AR_PHY_RX_CHAINMASK, 0x7);
                        REG_WRITE(ah, AR_PHY_CAL_CHAINMASK, 0x7);
                        break;
                }
-               /* fall through */
+               fallthrough;
        case 0x1:
        case 0x2:
        case 0x7:
 
        switch (i->aggr) {
        case AGGR_BUF_FIRST:
                ctl6 |= SM(i->aggr_len, AR_AggrLen);
-               /* fall through */
+               fallthrough;
        case AGGR_BUF_MIDDLE:
                ctl1 |= AR_IsAggr | AR_MoreAggr;
                ctl6 |= SM(i->ndelim, AR_PadDelim);
 
                                aModeRefSel = 2;
                        if (aModeRefSel)
                                break;
-                       /* fall through */
+                       fallthrough;
                case 1:
                default:
                        aModeRefSel = 0;
 
        switch (i->aggr) {
        case AGGR_BUF_FIRST:
                ctl17 |= SM(i->aggr_len, AR_AggrLen);
-               /* fall through */
+               fallthrough;
        case AGGR_BUF_MIDDLE:
                ctl12 |= AR_IsAggr | AR_MoreAggr;
                ctl17 |= SM(i->ndelim, AR_PadDelim);
 
                        "Move chanctx state from FORCE_ACTIVE to IDLE\n");
 
                sc->sched.state = ATH_CHANCTX_STATE_IDLE;
-               /* fall through */
+               fallthrough;
        case ATH_CHANCTX_EVENT_SWITCH:
                if (!test_bit(ATH_OP_MULTI_CHANNEL, &common->op_flags) ||
                    sc->sched.state == ATH_CHANCTX_STATE_FORCE_ACTIVE ||
                        mod_timer(&sc->offchannel.timer, jiffies + HZ / 10);
                        break;
                }
-               /* fall through */
+               fallthrough;
        case ATH_OFFCHANNEL_SUSPEND:
                if (!sc->offchannel.scan_req)
                        return;
 
                        return AR5416_PWR_TABLE_OFFSET_DB;
        case EEP_ANTENNA_GAIN_2G:
                band = 1;
-               /* fall through */
+               fallthrough;
        case EEP_ANTENNA_GAIN_5G:
                return max_t(u8, max_t(u8,
                        pModal[band].antennaGainCh[0],
 
                        REG_SET_BIT(ah, AR_CFG, AR_CFG_AP_ADHOC_INDICATION);
                        break;
                }
-               /* fall through */
+               fallthrough;
        case NL80211_IFTYPE_OCB:
        case NL80211_IFTYPE_MESH_POINT:
        case NL80211_IFTYPE_AP:
                set |= AR_STA_ID1_STA_AP;
-               /* fall through */
+               fallthrough;
        case NL80211_IFTYPE_STATION:
                REG_CLR_BIT(ah, AR_CFG, AR_CFG_AP_ADHOC_INDICATION);
                break;
        case NL80211_IFTYPE_ADHOC:
                REG_SET_BIT(ah, AR_TXCFG,
                            AR_TXCFG_ADHOC_BEACON_ATIM_TX_POLICY);
-               /* fall through */
+               fallthrough;
        case NL80211_IFTYPE_MESH_POINT:
        case NL80211_IFTYPE_AP:
                REG_WRITE(ah, AR_NEXT_TBTT_TIMER, next_beacon);
 
        case IEEE80211_AMPDU_TX_STOP_FLUSH:
        case IEEE80211_AMPDU_TX_STOP_FLUSH_CONT:
                flush = true;
-               /* fall through */
+               fallthrough;
        case IEEE80211_AMPDU_TX_STOP_CONT:
                ath9k_ps_wakeup(sc);
                ath_tx_aggr_stop(sc, sta, tid);