cfg80211: add helper functions for start/end freq

Add helper fuctions for start/end freq.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Reviewed-by: Luis R. Rodriguez <mcgrof@do-not-panic.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/wireless/chan.c b/net/wireless/chan.c
index 3449664..1d25a46 100644 (file)
--- a/net/wireless/chan.c
+++ b/net/wireless/chan.c
@@ -277,6 +277,32 @@ void cfg80211_set_dfs_state(struct wiphy *wiphy,
                                     width, dfs_state);
 }
 
+static u32 cfg80211_get_start_freq(u32 center_freq,
+                                  u32 bandwidth)
+{
+       u32 start_freq;
+
+       if (bandwidth <= 20)
+               start_freq = center_freq;
+       else
+               start_freq = center_freq - bandwidth/2 + 10;
+
+       return start_freq;
+}
+
+static u32 cfg80211_get_end_freq(u32 center_freq,
+                                u32 bandwidth)
+{
+       u32 end_freq;
+
+       if (bandwidth <= 20)
+               end_freq = center_freq;
+       else
+               end_freq = center_freq + bandwidth/2 - 10;
+
+       return end_freq;
+}
+
 static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
                                            u32 center_freq,
                                            u32 bandwidth)
@@ -284,13 +310,8 @@ static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy,
        struct ieee80211_channel *c;
        u32 freq, start_freq, end_freq;
 
-       if (bandwidth <= 20) {
-               start_freq = center_freq;
-               end_freq = center_freq;
-       } else {
-               start_freq = center_freq - bandwidth/2 + 10;
-               end_freq = center_freq + bandwidth/2 - 10;
-       }
+       start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
+       end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
 
        for (freq = start_freq; freq <= end_freq; freq += 20) {
                c = ieee80211_get_channel(wiphy, freq);
@@ -337,13 +358,8 @@ static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy,
        struct ieee80211_channel *c;
        u32 freq, start_freq, end_freq;
 
-       if (bandwidth <= 20) {
-               start_freq = center_freq;
-               end_freq = center_freq;
-       } else {
-               start_freq = center_freq - bandwidth/2 + 10;
-               end_freq = center_freq + bandwidth/2 - 10;
-       }
+       start_freq = cfg80211_get_start_freq(center_freq, bandwidth);
+       end_freq = cfg80211_get_end_freq(center_freq, bandwidth);
 
        for (freq = start_freq; freq <= end_freq; freq += 20) {
                c = ieee80211_get_channel(wiphy, freq);