mac80211: Allow disabling SGI-20

This allows user-space (wpa_supplicant) to disable
short guard interval (SGI) for 20Mhz.  The SGI-40
disable option is already handled.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/ht.c b/net/mac80211/ht.c
index a71d891..8a6d68f 100644 (file)
--- a/net/mac80211/ht.c
+++ b/net/mac80211/ht.c
@@ -62,6 +62,9 @@ void ieee80211_apply_htcap_overrides(struct ieee80211_sub_if_data *sdata,
        __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SUP_WIDTH_20_40);
        __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_40);
 
+       /* Allow user to disable SGI-20 (SGI-40 is handled above) */
+       __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_SGI_20);
+
        /* Allow user to disable the max-AMSDU bit. */
        __check_htcap_disable(sdata, ht_cap, IEEE80211_HT_CAP_MAX_AMSDU);
 

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index 1b087ff..0c0d4ca 100644 (file)
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -537,6 +537,7 @@ static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 
        .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
                                IEEE80211_HT_CAP_MAX_AMSDU |
+                               IEEE80211_HT_CAP_SGI_20 |
                                IEEE80211_HT_CAP_SGI_40),
        .mcs = {
                .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,