From: Johannes Berg <johannes.berg@xxxxxxxxx>
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@xxxxxxxxx>
Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
---
net/wireless/util.c | 15 +++++++--------
1 file 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;
}
--
2.19.2
