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VHT: Remove useless validation code from Operating Mode Notification

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This was added by commit 8a45811638
('hostapd: Add Operating Mode Notification support'), but the validation
steps cannot be true either for the channel width (which is a two-bit
subfield that cannot encode more than the list four values) or Rx NSS
(which cannot encode a value larger 7). Furthermore, the VHT_CHANWIDTH_*
defines do not match the definition of the Channel Width subfield
values.

Since this check cannot ever match, it is better to remove it to make
the code easier to understand and to avoid getting complaints about dead
code from static analyzers.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2014-06-18 00:45:48 +03:00
parent e0534ecf90
commit 35cbadbb14
1 changed files with 0 additions and 14 deletions
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14
src/ap/ieee802_11_vht.c
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@ -112,25 +112,11 @@ u16 copy_sta_vht_capab(struct hostapd_data *hapd, struct sta_info *sta,
u16 set_sta_vht_opmode(struct hostapd_data *hapd, struct sta_info *sta,
const u8 *vht_oper_notif)
{
u8 channel_width;
if (!vht_oper_notif) {
sta->flags &= ~WLAN_STA_VHT_OPMODE_ENABLED;
return WLAN_STATUS_SUCCESS;
}
channel_width = *vht_oper_notif & VHT_OPMODE_CHANNEL_WIDTH_MASK;
if (channel_width != VHT_CHANWIDTH_USE_HT &&
channel_width != VHT_CHANWIDTH_80MHZ &&
channel_width != VHT_CHANWIDTH_160MHZ &&
channel_width != VHT_CHANWIDTH_80P80MHZ &&
((*vht_oper_notif & VHT_OPMODE_CHANNEL_RxNSS_MASK) >>
VHT_OPMODE_NOTIF_RX_NSS_SHIFT) > VHT_RX_NSS_MAX_STREAMS - 1) {
sta->flags &= ~WLAN_STA_VHT_OPMODE_ENABLED;
return WLAN_STATUS_UNSPECIFIED_FAILURE;
}
sta->flags |= WLAN_STA_VHT_OPMODE_ENABLED;
sta->vht_opmode = *vht_oper_notif;
return WLAN_STATUS_SUCCESS;