diff options
| author | Amitkumar Karwar <akarwar@marvell.com> | 2011-04-21 14:10:27 -0700 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-04-25 14:50:17 -0400 |
| commit | 40db6c77ab48c3f3240422ff92fd6da222e2eb95 (patch) | |
| tree | f880a016b250d24bd8c2af822c9f345b6f41de32 /net/wireless/core.c | |
| parent | 0a6c9b1b666671a22905d38bc41ec1a04b85832f (diff) | |
| download | linux-40db6c77ab48c3f3240422ff92fd6da222e2eb95.tar.bz2 | |
cfg80211: module_param to disable HT40 in 2.4GHz band
Currently mac80211 uses ieee80211_disable_40mhz_24ghz module
parameter to allow disabling 40MHz operation in the 2.4GHz band.
Move this handling from mac80211 to cfg80211 so that the feature
will be more generic.
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/wireless/core.c')
| -rw-r--r-- | net/wireless/core.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c index fe01de29bfe8..bbf1fa11107a 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -46,6 +46,11 @@ static struct dentry *ieee80211_debugfs_dir; /* for the cleanup, scan and event works */ struct workqueue_struct *cfg80211_wq; +static bool cfg80211_disable_40mhz_24ghz; +module_param(cfg80211_disable_40mhz_24ghz, bool, 0644); +MODULE_PARM_DESC(cfg80211_disable_40mhz_24ghz, + "Disable 40MHz support in the 2.4GHz band"); + /* requires cfg80211_mutex to be held! */ struct cfg80211_registered_device *cfg80211_rdev_by_wiphy_idx(int wiphy_idx) { @@ -451,6 +456,18 @@ int wiphy_register(struct wiphy *wiphy) return -EINVAL; /* + * Since cfg80211_disable_40mhz_24ghz is global, we can + * modify the sband's ht data even if the driver uses a + * global structure for that. + */ + if (cfg80211_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; + } + + /* * Since we use a u32 for rate bitmaps in * ieee80211_get_response_rate, we cannot * have more than 32 legacy rates. |