mac80211: Introduce a generic commit() to apply changes

This patch introduces a generic commit() function which initiate a
new network joining process. It should be called after some interface
config changes, so that the changes get applied more cleanly. Currently
set_ssid() and set_bssid() call it. Others can be added in future
patches.

In version 1 the header files was forgotten, sorry.

Signed-off-by: Alina Friedrichsen <x-alina@gmx.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/mac80211/ibss.c

@@ -788,6 +788,23 @@ void ieee80211_ibss_setup_sdata(struct ieee80211_sub_if_data *sdata)
 			IEEE80211_IBSS_AUTO_CHANNEL_SEL;
 }
 
+int ieee80211_ibss_commit(struct ieee80211_sub_if_data *sdata)
+{
+	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
+
+	ifibss->flags &= ~IEEE80211_IBSS_PREV_BSSID_SET;
+
+	if (ifibss->ssid_len)
+		ifibss->flags |= IEEE80211_IBSS_SSID_SET;
+	else
+		ifibss->flags &= ~IEEE80211_IBSS_SSID_SET;
+
+	ifibss->ibss_join_req = jiffies;
+	ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
+
+	return ieee80211_sta_find_ibss(sdata);
+}
+
 int ieee80211_ibss_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
 {
 	struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
@@ -801,16 +818,7 @@ int ieee80211_ibss_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, siz
 		ifibss->ssid_len = len;
 	}
 
-	ifibss->flags &= ~IEEE80211_IBSS_PREV_BSSID_SET;
-
-	if (len)
-		ifibss->flags |= IEEE80211_IBSS_SSID_SET;
-	else
-		ifibss->flags &= ~IEEE80211_IBSS_SSID_SET;
-
-	ifibss->ibss_join_req = jiffies;
-	ifibss->state = IEEE80211_IBSS_MLME_SEARCH;
-	return ieee80211_sta_find_ibss(sdata);
+	return ieee80211_ibss_commit(sdata);
 }
 
 int ieee80211_ibss_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
@@ -842,7 +850,7 @@ int ieee80211_ibss_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
 		}
 	}
 
-	return ieee80211_ibss_set_ssid(sdata, ifibss->ssid, ifibss->ssid_len);
+	return ieee80211_ibss_commit(sdata);
 }
 
 /* scan finished notification */

net/mac80211/ieee80211_i.h

@@ -934,6 +934,7 @@ void ieee80211_sta_setup_sdata(struct ieee80211_sub_if_data *sdata);
 ieee80211_rx_result ieee80211_sta_rx_mgmt(struct ieee80211_sub_if_data *sdata,
 					  struct sk_buff *skb,
 					  struct ieee80211_rx_status *rx_status);
+int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata);
 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len);
 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len);
 int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid);
@@ -944,6 +945,7 @@ void ieee80211_send_pspoll(struct ieee80211_local *local,
 			   struct ieee80211_sub_if_data *sdata);
 
 /* IBSS code */
+int ieee80211_ibss_commit(struct ieee80211_sub_if_data *sdata);
 int ieee80211_ibss_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len);
 int ieee80211_ibss_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len);
 int ieee80211_ibss_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid);

net/mac80211/mlme.c

@@ -1855,6 +1855,20 @@ void ieee80211_sta_req_auth(struct ieee80211_sub_if_data *sdata)
 	}
 }
 
+int ieee80211_sta_commit(struct ieee80211_sub_if_data *sdata)
+{
+	struct ieee80211_if_managed *ifmgd = &sdata->u.mgd;
+
+	ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
+
+	if (ifmgd->ssid_len)
+		ifmgd->flags |= IEEE80211_STA_SSID_SET;
+	else
+		ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
+
+	return 0;
+}
+
 int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t len)
 {
 	struct ieee80211_if_managed *ifmgd;
@@ -1870,14 +1884,7 @@ int ieee80211_sta_set_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size
 		ifmgd->ssid_len = len;
 	}
 
-	ifmgd->flags &= ~IEEE80211_STA_PREV_BSSID_SET;
-
-	if (len)
-		ifmgd->flags |= IEEE80211_STA_SSID_SET;
-	else
-		ifmgd->flags &= ~IEEE80211_STA_SSID_SET;
-
-	return 0;
+	return ieee80211_sta_commit(sdata);
 }
 
 int ieee80211_sta_get_ssid(struct ieee80211_sub_if_data *sdata, char *ssid, size_t *len)
@@ -1907,7 +1914,7 @@ int ieee80211_sta_set_bssid(struct ieee80211_sub_if_data *sdata, u8 *bssid)
 		}
 	}
 
-	return ieee80211_sta_set_ssid(sdata, ifmgd->ssid, ifmgd->ssid_len);
+	return ieee80211_sta_commit(sdata);
 }
 
 int ieee80211_sta_set_extra_ie(struct ieee80211_sub_if_data *sdata, char *ie, size_t len)