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cfg80211: util: fix bit count off by one

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The bits of Rx MCS Map in VHT capability were enumerated
with index transform - index i -> (i + 1) bit => nss i. BUG!
while it should be -   index i -> (i + 1) bit => (i + 1) nss.

The bug was exposed in commit a53b2a0b12 ("iwlwifi: mvm: implement VHT
extended NSS support in rs.c"), where iwlwifi started using the
function.

Signed-off-by: Mordechay Goodstein <[email protected]>
Fixes: b0aa75f0b1 ("ieee80211: add new VHT capability fields/parsing")
Signed-off-by: Luca Coelho <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
This commit is contained in:
Mordechay Goodstein 2019-05-29 15:25:31 +03:00 • committed by Johannes Berg
commit 1a473d6092
1 changed files with 1 additions and 1 deletions
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2
net/wireless/util.c
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@ -1998,7 +1998,7 @@ int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap,
continue;
if (supp >= mcs_encoding) {
max_vht_nss = i;
max_vht_nss = i + 1;
break;
}
}