1 files changed, 29 insertions, 4 deletions

diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index c155c0b69426..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");
@@ -112,7 +112,13 @@ bool ieee80211_cfg_on_oper_channel(struct ieee80211_local *local)
         /* This logic needs to match logic in ieee80211_hw_config */
         if (local->scan_channel) {
                 chan = local->scan_channel;
-                channel_type = NL80211_CHAN_NO_HT;
+                /* If scanning on oper channel, use whatever channel-type
+                 * is currently in use.
+                 */
+                if (chan == local->oper_channel)
+                        channel_type = local->_oper_channel_type;
+                else
+                        channel_type = NL80211_CHAN_NO_HT;
         } else if (local->tmp_channel) {
                 chan = scan_chan = local->tmp_channel;
                 channel_type = local->tmp_channel_type;
@@ -151,7 +157,13 @@ int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
         if (scan_chan) {
                 chan = scan_chan;
-                channel_type = NL80211_CHAN_NO_HT;
+                /* If scanning on oper channel, use whatever channel-type
+                 * is currently in use.
+                 */
+                if (chan == local->oper_channel)
+                        channel_type = local->_oper_channel_type;
+                else
+                        channel_type = NL80211_CHAN_NO_HT;
         } else if (local->tmp_channel) {
                 chan = scan_chan = local->tmp_channel;
                 channel_type = local->tmp_channel_type;
@@ -187,7 +199,8 @@ int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
                 changed |= IEEE80211_CONF_CHANGE_SMPS;
         }
 
-        if (scan_chan)
+        if ((local->scanning & SCAN_SW_SCANNING) ||
+            (local->scanning & SCAN_HW_SCANNING))
                 power = chan->max_power;
         else
                 power = local->power_constr_level ?
@@ -710,6 +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;