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 <gustavo...@kernel.org>
---
 drivers/net/wireless/ath/carl9170/rx.c | 2 +-
 drivers/net/wireless/ath/carl9170/tx.c | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ath/carl9170/rx.c 
b/drivers/net/wireless/ath/carl9170/rx.c
index 23ab8a80c18c..908c4c8b7f82 100644
--- a/drivers/net/wireless/ath/carl9170/rx.c
+++ b/drivers/net/wireless/ath/carl9170/rx.c
@@ -766,7 +766,7 @@ static void carl9170_rx_untie_data(struct ar9170 *ar, u8 
*buf, int len)
 
                        goto drop;
                }
-               /* fall through */
+               fallthrough;
 
        case AR9170_RX_STATUS_MPDU_MIDDLE:
                /*  These are just data + mac status */
diff --git a/drivers/net/wireless/ath/carl9170/tx.c 
b/drivers/net/wireless/ath/carl9170/tx.c
index 2407931440ed..8f896e1a6ad6 100644
--- a/drivers/net/wireless/ath/carl9170/tx.c
+++ b/drivers/net/wireless/ath/carl9170/tx.c
@@ -830,12 +830,12 @@ static bool carl9170_tx_rts_check(struct ar9170 *ar,
        case CARL9170_ERP_AUTO:
                if (ampdu)
                        break;
-               /* fall through */
+               fallthrough;
 
        case CARL9170_ERP_MAC80211:
                if (!(rate->flags & IEEE80211_TX_RC_USE_RTS_CTS))
                        break;
-               /* fall through */
+               fallthrough;
 
        case CARL9170_ERP_RTS:
                if (likely(!multi))
@@ -856,7 +856,7 @@ static bool carl9170_tx_cts_check(struct ar9170 *ar,
        case CARL9170_ERP_MAC80211:
                if (!(rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT))
                        break;
-               /* fall through */
+               fallthrough;
 
        case CARL9170_ERP_CTS:
                return true;
-- 
2.27.0

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