cfg80211: move cfg80211_get_dev_from_ifindex under wext

The function is only used and needed by the wext code
for scanning, so move it there.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index fd99ea495b7e..2ce44a712f13 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -1040,6 +1040,27 @@ void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
 EXPORT_SYMBOL(cfg80211_unlink_bss);
 
 #ifdef CONFIG_CFG80211_WEXT
+static struct cfg80211_registered_device *
+cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
+{
+        struct cfg80211_registered_device *rdev = ERR_PTR(-ENODEV);
+        struct net_device *dev;
+
+        mutex_lock(&cfg80211_mutex);
+        dev = dev_get_by_index(net, ifindex);
+        if (!dev)
+                goto out;
+        if (dev->ieee80211_ptr) {
+                rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
+                mutex_lock(&rdev->mtx);
+        } else
+                rdev = ERR_PTR(-ENODEV);
+        dev_put(dev);
+ out:
+        mutex_unlock(&cfg80211_mutex);
+        return rdev;
+}
+
 int cfg80211_wext_siwscan(struct net_device *dev,
                           struct iw_request_info *info,
                           union iwreq_data *wrqu, char *extra)