mac80211: correct use_short_preamble handling

ERP IE bit for preamble mode is 0 for short and 1 for long, not the other
way around. This fixes the value reported to the driver via
bss_conf->use_short_preamble field.

Signed-off-by: Vladimir Koutny <vlado@ksp.sk>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 4 insertions, 5 deletions

diff --git a/net/mac80211/ieee80211_sta.c b/net/mac80211/ieee80211_sta.c
index 9aeed5320228..e0c72d04584b 100644
--- a/net/mac80211/ieee80211_sta.c
+++ b/net/mac80211/ieee80211_sta.c
@@ -319,7 +319,7 @@ static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
         struct ieee80211_bss_conf *bss_conf = &sdata->bss_conf;
         struct ieee80211_if_sta *ifsta = &sdata->u.sta;
         bool use_protection = (erp_value & WLAN_ERP_USE_PROTECTION) != 0;
-        bool preamble_mode = (erp_value & WLAN_ERP_BARKER_PREAMBLE) != 0;
+        bool use_short_preamble = (erp_value & WLAN_ERP_BARKER_PREAMBLE) == 0;
         DECLARE_MAC_BUF(mac);
         u32 changed = 0;
 
@@ -335,16 +335,15 @@ static u32 ieee80211_handle_erp_ie(struct ieee80211_sub_if_data *sdata,
                 changed |= BSS_CHANGED_ERP_CTS_PROT;
         }
 
-        if (preamble_mode != bss_conf->use_short_preamble) {
+        if (use_short_preamble != bss_conf->use_short_preamble) {
                 if (net_ratelimit()) {
                         printk(KERN_DEBUG "%s: switched to %s barker preamble"
                                " (BSSID=%s)\n",
                                sdata->dev->name,
-                               (preamble_mode == WLAN_ERP_PREAMBLE_SHORT) ?
-                                        "short" : "long",
+                               use_short_preamble ? "short" : "long",
                                print_mac(mac, ifsta->bssid));
                 }
-                bss_conf->use_short_preamble = preamble_mode;
+                bss_conf->use_short_preamble = use_short_preamble;
                 changed |= BSS_CHANGED_ERP_PREAMBLE;
         }