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authorJohannes Berg <johannes@sipsolutions.net>2009-08-12 22:21:21 +0200
committerJohn W. Linville <linville@tuxdriver.com>2009-08-14 09:14:07 -0400
commit36e6fea84905512ea776707e82b5b435220efc17 (patch)
treedb588e7dbbfcf0fa47f4954344a03961e960c898
parent70bdb6b275d789ddf05c3a858e6b57715539394b (diff)
cfg80211: check for and abort dangling scan requests
If you trigger a scan request on an interface and then take it down, or rmmod the module or unplug the device the driver might "forget" to cancel the scan request. That is a bug in the driver, but the current behaviour is that we just hang endlessly waiting for the netdev refcount to become 0 which it never will. To improve robustness, check for this situation in cfg80211, warn about it and clean up behind the driver. I don't just clean up silently because it's likely that the driver also has some internal state it has now leaked. Additionally, this fixes a locking bug, clearing the scan_req pointer should be done under the rdev lock. Finally, we also need to _wait_ for the scan work and not just abort it since it might be pending and wanting to do a cleanup. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
-rw-r--r--net/wireless/core.c10
-rw-r--r--net/wireless/core.h1
-rw-r--r--net/wireless/scan.c26
3 files changed, 26 insertions, 11 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c
index e630648fef79..35d83bedfe5b 100644
--- a/net/wireless/core.c
+++ b/net/wireless/core.c
@@ -601,8 +601,8 @@ void wiphy_unregister(struct wiphy *wiphy)
mutex_unlock(&cfg80211_mutex);
+ flush_work(&rdev->scan_done_wk);
cancel_work_sync(&rdev->conn_work);
- cancel_work_sync(&rdev->scan_done_wk);
kfree(rdev->scan_req);
flush_work(&rdev->event_work);
}
@@ -728,6 +728,13 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
#endif
break;
case NETDEV_UNREGISTER:
+ cfg80211_lock_rdev(rdev);
+
+ if (WARN_ON(rdev->scan_req && rdev->scan_req->dev == dev)) {
+ rdev->scan_req->aborted = true;
+ ___cfg80211_scan_done(rdev);
+ }
+
mutex_lock(&rdev->devlist_mtx);
/*
* It is possible to get NETDEV_UNREGISTER
@@ -746,6 +753,7 @@ static int cfg80211_netdev_notifier_call(struct notifier_block * nb,
#endif
}
mutex_unlock(&rdev->devlist_mtx);
+ cfg80211_unlock_rdev(rdev);
break;
case NETDEV_PRE_UP:
if (!(wdev->wiphy->interface_modes & BIT(wdev->iftype)))
diff --git a/net/wireless/core.h b/net/wireless/core.h
index f7be3a9b427e..c603f5286326 100644
--- a/net/wireless/core.h
+++ b/net/wireless/core.h
@@ -368,6 +368,7 @@ void cfg80211_sme_scan_done(struct net_device *dev);
void cfg80211_sme_rx_auth(struct net_device *dev, const u8 *buf, size_t len);
void cfg80211_sme_disassoc(struct net_device *dev, int idx);
void __cfg80211_scan_done(struct work_struct *wk);
+void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev);
void cfg80211_upload_connect_keys(struct wireless_dev *wdev);
struct ieee80211_channel *
diff --git a/net/wireless/scan.c b/net/wireless/scan.c
index e6c1f11595da..fe575a24c95c 100644
--- a/net/wireless/scan.c
+++ b/net/wireless/scan.c
@@ -18,19 +18,14 @@
#define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ)
-void __cfg80211_scan_done(struct work_struct *wk)
+void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev)
{
- struct cfg80211_registered_device *rdev;
struct cfg80211_scan_request *request;
struct net_device *dev;
#ifdef CONFIG_WIRELESS_EXT
union iwreq_data wrqu;
#endif
- rdev = container_of(wk, struct cfg80211_registered_device,
- scan_done_wk);
-
- mutex_lock(&rdev->mtx);
request = rdev->scan_req;
dev = request->dev;
@@ -43,9 +38,9 @@ void __cfg80211_scan_done(struct work_struct *wk)
cfg80211_sme_scan_done(dev);
if (request->aborted)
- nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev);
+ nl80211_send_scan_aborted(rdev, dev);
else
- nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev);
+ nl80211_send_scan_done(rdev, dev);
#ifdef CONFIG_WIRELESS_EXT
if (!request->aborted) {
@@ -57,11 +52,22 @@ void __cfg80211_scan_done(struct work_struct *wk)
dev_put(dev);
- cfg80211_unlock_rdev(rdev);
- wiphy_to_dev(request->wiphy)->scan_req = NULL;
+ rdev->scan_req = NULL;
kfree(request);
}
+void __cfg80211_scan_done(struct work_struct *wk)
+{
+ struct cfg80211_registered_device *rdev;
+
+ rdev = container_of(wk, struct cfg80211_registered_device,
+ scan_done_wk);
+
+ cfg80211_lock_rdev(rdev);
+ ___cfg80211_scan_done(rdev);
+ cfg80211_unlock_rdev(rdev);
+}
+
void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
{
WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);