Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[linux-2.6.git] / net / wireless / nl80211.c
index 491b0ba..6a82c89 100644 (file)
@@ -3470,9 +3470,6 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
        if (!is_valid_ie_attr(info->attrs[NL80211_ATTR_IE]))
                return -EINVAL;
 
-       if (rdev->sched_scan_req)
-               return -EINPROGRESS;
-
        if (!info->attrs[NL80211_ATTR_SCHED_SCAN_INTERVAL])
                return -EINVAL;
 
@@ -3511,12 +3508,21 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
        if (ie_len > wiphy->max_scan_ie_len)
                return -EINVAL;
 
+       mutex_lock(&rdev->sched_scan_mtx);
+
+       if (rdev->sched_scan_req) {
+               err = -EINPROGRESS;
+               goto out;
+       }
+
        request = kzalloc(sizeof(*request)
                        + sizeof(*request->ssids) * n_ssids
                        + sizeof(*request->channels) * n_channels
                        + ie_len, GFP_KERNEL);
-       if (!request)
-               return -ENOMEM;
+       if (!request) {
+               err = -ENOMEM;
+               goto out;
+       }
 
        if (n_ssids)
                request->ssids = (void *)&request->channels[n_channels];
@@ -3614,6 +3620,7 @@ static int nl80211_start_sched_scan(struct sk_buff *skb,
 out_free:
        kfree(request);
 out:
+       mutex_unlock(&rdev->sched_scan_mtx);
        return err;
 }
 
@@ -3621,12 +3628,17 @@ static int nl80211_stop_sched_scan(struct sk_buff *skb,
                                   struct genl_info *info)
 {
        struct cfg80211_registered_device *rdev = info->user_ptr[0];
+       int err;
 
        if (!(rdev->wiphy.flags & WIPHY_FLAG_SUPPORTS_SCHED_SCAN) ||
            !rdev->ops->sched_scan_stop)
                return -EOPNOTSUPP;
 
-       return __cfg80211_stop_sched_scan(rdev, false);
+       mutex_lock(&rdev->sched_scan_mtx);
+       err = __cfg80211_stop_sched_scan(rdev, false);
+       mutex_unlock(&rdev->sched_scan_mtx);
+
+       return err;
 }
 
 static int nl80211_send_bss(struct sk_buff *msg, struct netlink_callback *cb,