From: Johannes Berg Date: Tue, 14 Feb 2023 19:08:15 +0000 (+0100) Subject: wifi: mac80211: fix off-by-one link setting X-Git-Tag: io_uring-6.3-2023-03-03~13^2~39^2~11 X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=cf08e29db760b144bde51e2444f3430c75763e26;p=linux-block.git wifi: mac80211: fix off-by-one link setting The convention for find_first_bit() is 0-based, while ffs() is 1-based, so this is now off-by-one. I cannot reproduce the gcc-9 problem, but since the -1 is now removed, I'm hoping it will still avoid the original issue. Reported-by: Alexander Lobakin Fixes: 1d8d4af43474 ("wifi: mac80211: avoid u32_encode_bits() warning") Signed-off-by: Johannes Berg --- diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c index 118648af979c..7699fb410670 100644 --- a/net/mac80211/tx.c +++ b/net/mac80211/tx.c @@ -4434,7 +4434,7 @@ static void ieee80211_mlo_multicast_tx(struct net_device *dev, u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX; if (hweight16(links) == 1) { - ctrl_flags |= u32_encode_bits(find_first_bit(&links, 16) - 1, + ctrl_flags |= u32_encode_bits(__ffs(links), IEEE80211_TX_CTRL_MLO_LINK); __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags,