From: Michal Kazior <michal.kazior@xxxxxxxxx>
Split functionality for further reuse.
Will prevent code duplication when channel context
channel_type merging is introduced.
Signed-off-by: Michal Kazior <michal.kazior@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
net/mac80211/chan.c | 67 ++++++++++++++++++++++++++++++++++++---------------
1 file changed, 48 insertions(+), 19 deletions(-)
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index 8d77ad13..90fef15 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -69,16 +69,14 @@ ieee80211_get_channel_mode(struct ieee80211_local *local,
return mode;
}
-bool ieee80211_set_channel_type(struct ieee80211_local *local,
- struct ieee80211_sub_if_data *sdata,
- enum nl80211_channel_type chantype)
+static enum nl80211_channel_type
+ieee80211_get_superchan(struct ieee80211_local *local,
+ struct ieee80211_sub_if_data *sdata)
{
- struct ieee80211_sub_if_data *tmp;
enum nl80211_channel_type superchan = NL80211_CHAN_NO_HT;
- bool result;
+ struct ieee80211_sub_if_data *tmp;
mutex_lock(&local->iflist_mtx);
-
list_for_each_entry(tmp, &local->interfaces, list) {
if (tmp == sdata)
continue;
@@ -104,41 +102,72 @@ bool ieee80211_set_channel_type(struct ieee80211_local *local,
break;
}
}
+ mutex_unlock(&local->iflist_mtx);
+
+ return superchan;
+}
- switch (superchan) {
+static bool
+ieee80211_channel_types_are_compatible(enum nl80211_channel_type chantype1,
+ enum nl80211_channel_type chantype2,
+ enum nl80211_channel_type *compat)
+{
+ /*
+ * start out with chantype1 being the result,
+ * overwriting later if needed
+ */
+ if (compat)
+ *compat = chantype1;
+
+ switch (chantype1) {
case NL80211_CHAN_NO_HT:
+ if (compat)
+ *compat = chantype2;
+ break;
case NL80211_CHAN_HT20:
/*
* allow any change that doesn't go to no-HT
* (if it already is no-HT no change is needed)
*/
- if (chantype == NL80211_CHAN_NO_HT)
+ if (chantype2 == NL80211_CHAN_NO_HT)
break;
- superchan = chantype;
+ if (compat)
+ *compat = chantype2;
break;
case NL80211_CHAN_HT40PLUS:
case NL80211_CHAN_HT40MINUS:
/* allow smaller bandwidth and same */
- if (chantype == NL80211_CHAN_NO_HT)
+ if (chantype2 == NL80211_CHAN_NO_HT)
break;
- if (chantype == NL80211_CHAN_HT20)
+ if (chantype2 == NL80211_CHAN_HT20)
break;
- if (superchan == chantype)
+ if (chantype2 == chantype1)
break;
- result = false;
- goto out;
+ return false;
}
- local->_oper_channel_type = superchan;
+ return true;
+}
+
+bool ieee80211_set_channel_type(struct ieee80211_local *local,
+ struct ieee80211_sub_if_data *sdata,
+ enum nl80211_channel_type chantype)
+{
+ enum nl80211_channel_type superchan;
+ enum nl80211_channel_type compatchan = NL80211_CHAN_NO_HT;
+
+ superchan = ieee80211_get_superchan(local, sdata);
+ if (!ieee80211_channel_types_are_compatible(superchan, chantype,
+ &compatchan))
+ return false;
+
+ local->_oper_channel_type = compatchan;
if (sdata)
sdata->vif.bss_conf.channel_type = chantype;
- result = true;
- out:
- mutex_unlock(&local->iflist_mtx);
+ return true;
- return result;
}
static struct ieee80211_chanctx *
--
1.7.10.4
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