cfg80211: don't request disconnect if not connected

Neil Brown reports that with libertas, my recent cfg80211
SME changes in commit ceca7b7121795ef81bd598a240d53a92566
("cfg80211: separate internal SME implementation") broke
libertas suspend because it we now asked it to disconnect
while already disconnected.

The problematic change is in cfg80211_disconnect() as it
previously checked the SME state and now calls the driver
disconnect operation unconditionally.

Fix this by checking if there's a current_bss indicating
a connection, and do nothing if not.

Reported-and-tested-by: Neil Brown <neilb@suse.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 4 insertions, 6 deletions

diff --git a/net/wireless/sme.c b/net/wireless/sme.c
index 81c8a10d743c..20e86a95dc4e 100644
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -976,21 +976,19 @@ int cfg80211_disconnect(struct cfg80211_registered_device *rdev,
                         struct net_device *dev, u16 reason, bool wextev)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
-        int err;
+        int err = 0;
 
         ASSERT_WDEV_LOCK(wdev);
 
         kfree(wdev->connect_keys);
         wdev->connect_keys = NULL;
 
-        if (wdev->conn) {
+        if (wdev->conn)
                 err = cfg80211_sme_disconnect(wdev, reason);
-        } else if (!rdev->ops->disconnect) {
+        else if (!rdev->ops->disconnect)
                 cfg80211_mlme_down(rdev, dev);
-                err = 0;
-        } else {
+        else if (wdev->current_bss)
                 err = rdev_disconnect(rdev, dev, reason);
-        }
 
         return err;
 }