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-rw-r--r--net/wireless/core.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c
index fe01de2..bbf1fa1 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.
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