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| author | Johannes Berg <johannes.berg@intel.com> | 2018-12-15 11:03:16 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2018-12-19 09:41:10 +0100 |
| commit | 93bc8ac49e82a329160604556b805b7fa614ff9e (patch) | |
| tree | 4e51fba2a2618693d9d0ff47cdbe9f40007eda34 /net/wireless | |
| parent | efc38dd7d5fa5c8cdd0c917c5d00947aa0539443 (diff) | |
| download | lwn-93bc8ac49e82a329160604556b805b7fa614ff9e.tar.gz lwn-93bc8ac49e82a329160604556b805b7fa614ff9e.zip | |
cfg80211: fix ieee80211_get_vht_max_nss()
Fix two bugs in ieee80211_get_vht_max_nss():
* the spec says we should round down
(reported by Nissim)
* there's a double condition, the first one is wrong,
supp_width == 0 / ext_nss_bw == 2 is valid in 80+80
(found by smatch)
Fixes: b0aa75f0b1b2 ("ieee80211: add new VHT capability fields/parsing")
Reported-by: Nissim Bendanan <nissimx.bendanan@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless')
| -rw-r--r-- | net/wireless/util.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/net/wireless/util.c b/net/wireless/util.c index ef14d80ca03e..06a084236841 100644 --- a/net/wireless/util.c +++ b/net/wireless/util.c @@ -2013,33 +2013,32 @@ int ieee80211_get_vht_max_nss(struct ieee80211_vht_cap *cap, case IEEE80211_VHT_CHANWIDTH_160MHZ: if (supp_width == 0 && (ext_nss_bw == 1 || ext_nss_bw == 2)) - return DIV_ROUND_UP(max_vht_nss, 2); + return max_vht_nss / 2; if (supp_width == 0 && ext_nss_bw == 3) - return DIV_ROUND_UP(3 * max_vht_nss, 4); + return (3 * max_vht_nss) / 4; if (supp_width == 1 && ext_nss_bw == 3) return 2 * max_vht_nss; break; case IEEE80211_VHT_CHANWIDTH_80P80MHZ: - if (supp_width == 0 && - (ext_nss_bw == 1 || ext_nss_bw == 2)) + if (supp_width == 0 && ext_nss_bw == 1) return 0; /* not possible */ if (supp_width == 0 && ext_nss_bw == 2) - return DIV_ROUND_UP(max_vht_nss, 2); + return max_vht_nss / 2; if (supp_width == 0 && ext_nss_bw == 3) - return DIV_ROUND_UP(3 * max_vht_nss, 4); + return (3 * max_vht_nss) / 4; if (supp_width == 1 && ext_nss_bw == 0) return 0; /* not possible */ if (supp_width == 1 && ext_nss_bw == 1) - return DIV_ROUND_UP(max_vht_nss, 2); + return max_vht_nss / 2; if (supp_width == 1 && ext_nss_bw == 2) - return DIV_ROUND_UP(3 * max_vht_nss, 4); + return (3 * max_vht_nss) / 4; break; } |