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   1 From: Felix Fietkau <nbd@nbd.name>
   2 Date: Wed, 11 Nov 2020 19:25:39 +0100
   3 Subject: [PATCH] mac80211: minstrel: fix tx status processing corner case
   4
   5 Some drivers fill the status rate list without setting the rate index after
   6 the final rate to -1. minstrel_ht already deals with this, but minstrel
   7 doesn't, which causes it to get stuck at the lowest rate on these drivers.
   8
   9 Fix this by checking the count as well.
  10
  11 Cc: stable@vger.kernel.org
  12 Fixes: cccf129f820e ("mac80211: add the 'minstrel' rate control algorithm")
  13 Signed-off-by: Felix Fietkau <nbd@nbd.name>
  14 ---
  15
  16 --- a/net/mac80211/rc80211_minstrel.c
  17 +++ b/net/mac80211/rc80211_minstrel.c
  18 @@ -274,7 +274,7 @@ minstrel_tx_status(void *priv, struct ie
  19         success = !!(info->flags & IEEE80211_TX_STAT_ACK);
  20
  21         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
  22 -               if (ar[i].idx < 0)
  23 +               if (ar[i].idx < 0 || !ar[i].count)
  24                         break;
  25
  26                 ndx = rix_to_ndx(mi, ar[i].idx);