diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2011-02-16 08:46:58 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-02-18 16:54:52 -0500 |
| commit | 8ba0537c620ad9f37b0e810ce0a9ff367a021f5e (patch) | |
| tree | 659622a8cd43642ca6438ec6a7a3e68e82d23efd /net/mac80211/main.c | |
| parent | 9bf8ab35f269d66e507de2b1ccc67a02d8284db5 (diff) | |
| download | linux-8ba0537c620ad9f37b0e810ce0a9ff367a021f5e.tar.bz2 | |
mac80211: fix 2.4 GHz 40 MHz disabling
The module parameter ieee80211_disable_40mhz_24ghz
was meant to allow disabling 40 MHz operation in
the 2.4 GHz band by default. However, it is buggy
as implemented because while it advertises to the
AP that the device doesn't support 40 MHz, it will
itself still use 40 MHz configurations.
To fix this, clear the 40 MHz bits from the sband
completely instead of overriding where used.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/main.c')
| -rw-r--r-- | net/mac80211/main.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/net/mac80211/main.c b/net/mac80211/main.c index e7eb2cfaf400..2543e48bd813 100644 --- a/net/mac80211/main.c +++ b/net/mac80211/main.c @@ -34,7 +34,7 @@ #include "debugfs.h" -bool ieee80211_disable_40mhz_24ghz; +static 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"); @@ -723,6 +723,18 @@ int ieee80211_register_hw(struct ieee80211_hw *hw) } channels += sband->n_channels; + /* + * Since ieee80211_disable_40mhz_24ghz is global, we can + * modify the sband's ht data even if the driver uses a + * global structure for that. + */ + if (ieee80211_disable_40mhz_24ghz && + band == IEEE80211_BAND_2GHZ && + sband->ht_cap.ht_supported) { + sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SUP_WIDTH_20_40; + sband->ht_cap.cap &= ~IEEE80211_HT_CAP_SGI_40; + } + if (max_bitrates < sband->n_bitrates) max_bitrates = sband->n_bitrates; supp_ht = supp_ht || sband->ht_cap.ht_supported; |