diff options
| author | Johannes Berg <johannes@sipsolutions.net> | 2009-12-01 20:29:42 +0300 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-12-22 21:31:17 +0300 |
| commit | f38fd12fa7b7b98e158a9b31d388da34eef25c22 (patch) | |
| tree | bf5f8407e3456e691e4ef873d343c3403974937a | |
| parent | 8b73d13a21ae889e747cac180ff27c5a0a88e6a4 (diff) | |
| download | linux-f38fd12fa7b7b98e158a9b31d388da34eef25c22.tar.xz | |
mac80211: allow disabling 40MHz on 2.4GHz
In some situations it is required that a system be
configured with no support for 40 MHz channels in
the 2.4 GHz band. Rather than imposing any such
restrictions on everybody, allow configuration a
system like that with a module parameter. It is
writable at runtime but only takes effect at the
time of the next association.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
| -rw-r--r-- | net/mac80211/ieee80211_i.h | 2 | ||||
| -rw-r--r-- | net/mac80211/main.c | 6 | ||||
| -rw-r--r-- | net/mac80211/mlme.c | 6 | ||||
| -rw-r--r-- | net/mac80211/util.c | 14 |
4 files changed, 25 insertions, 3 deletions
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h index e63aecbddfbe..6fb3f7181536 100644 --- a/net/mac80211/ieee80211_i.h +++ b/net/mac80211/ieee80211_i.h @@ -881,6 +881,8 @@ void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata, void ieee80211_configure_filter(struct ieee80211_local *local); u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata); +extern bool ieee80211_disable_40mhz_24ghz; + /* STA code */ void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata); int ieee80211_mgd_auth(struct ieee80211_sub_if_data *sdata, diff --git a/net/mac80211/main.c b/net/mac80211/main.c index e1293e8ed83a..25f52098b636 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -33,6 +33,12 @@ #include "cfg.h" #include "debugfs.h" + +bool ieee80211_disable_40mhz_24ghz; +module_param(ieee80211_disable_40mhz_24ghz, bool, 0644); +MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz, + "Disable 40MHz support in the 2.4GHz band"); + void ieee80211_configure_filter(struct ieee80211_local *local) { u64 mc; diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c index 0a762a9ba4df..a7472c979c63 100644 --- a/net/mac80211/mlme.c +++ b/net/mac80211/mlme.c @@ -400,6 +400,12 @@ static void ieee80211_send_assoc(struct ieee80211_sub_if_data *sdata, /* determine capability flags */ + if (ieee80211_disable_40mhz_24ghz && + sband->band == IEEE80211_BAND_2GHZ) { + cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; + cap &= ~IEEE80211_HT_CAP_SGI_40; + } + switch (ht_info->ht_param & IEEE80211_HT_PARAM_CHA_SEC_OFFSET) { case IEEE80211_HT_PARAM_CHA_SEC_ABOVE: if (flags & IEEE80211_CHAN_NO_HT40PLUS) { diff --git a/net/mac80211/util.c b/net/mac80211/util.c index 086ef6257b4b..acb6626ad0a4 100644 --- a/net/mac80211/util.c +++ b/net/mac80211/util.c @@ -908,16 +908,24 @@ int ieee80211_build_preq_ies(struct ieee80211_local *local, u8 *buffer, } if (sband->ht_cap.ht_supported) { - __le16 tmp = cpu_to_le16(sband->ht_cap.cap); + u16 cap = sband->ht_cap.cap; + __le16 tmp; + + if (ieee80211_disable_40mhz_24ghz && + sband->band == IEEE80211_BAND_2GHZ) { + cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; + cap &= ~IEEE80211_HT_CAP_SGI_40; + } *pos++ = WLAN_EID_HT_CAPABILITY; *pos++ = sizeof(struct ieee80211_ht_cap); memset(pos, 0, sizeof(struct ieee80211_ht_cap)); + tmp = cpu_to_le16(cap); memcpy(pos, &tmp, sizeof(u16)); pos += sizeof(u16); - /* TODO: needs a define here for << 2 */ *pos++ = sband->ht_cap.ampdu_factor | - (sband->ht_cap.ampdu_density << 2); + (sband->ht_cap.ampdu_density << + IEEE80211_HT_AMPDU_PARM_DENSITY_SHIFT); memcpy(pos, &sband->ht_cap.mcs, sizeof(sband->ht_cap.mcs)); pos += sizeof(sband->ht_cap.mcs); pos += 2 + 4 + 1; /* ext info, BF cap, antsel */ |