diff options
| author | Johannes Berg <johannes.berg@intel.com> | 2020-06-04 13:04:20 +0300 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2020-06-05 10:22:00 +0300 |
| commit | 79ea1e12c0b8540100e89b32afb9f0e6503fad35 (patch) | |
| tree | a5ce18c194bb617ec5337fedfe2395ba02ca5a9b /net/wireless/core.c | |
| parent | 98749b7188affbf2900c2aab704a8853901d1139 (diff) | |
| download | linux-79ea1e12c0b8540100e89b32afb9f0e6503fad35.tar.xz | |
cfg80211: fix management registrations deadlock
Lockdep reports that we may deadlock because we take the RTNL on
the work struct, but flush it under RTNL. Clearly, it's correct.
In practice, this can happen when doing rfkill on an active device.
Fix this by moving the work struct to the wiphy (registered dev)
layer, and iterate over all the wdevs inside there. This then
means we need to track which one of them has work to do, so we
don't update to the driver for all wdevs all the time.
Also fix a locking bug I noticed while working on this - the
registrations list is iterated as if it was an RCU list, but it
isn't handle that way - and we need to lock now for the update
flag anyway, so remove the RCU.
Fixes: 6cd536fe62ef ("cfg80211: change internal management frame registration API")
Reported-by: Markus Theil <markus.theil@tu-ilmenau.de>
Reported-and-tested-by: Kenneth R. Crudup <kenny@panix.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Link: https://lore.kernel.org/r/20200604120420.b1dc540a7e26.I55dcca56bb5bdc5d7ad66a36a0b42afd7034d8be@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless/core.c')
| -rw-r--r-- | net/wireless/core.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/wireless/core.c b/net/wireless/core.c index f0226ae9561c..c623d9bf5096 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -497,6 +497,8 @@ use_default_name: INIT_WORK(&rdev->propagate_radar_detect_wk, cfg80211_propagate_radar_detect_wk); INIT_WORK(&rdev->propagate_cac_done_wk, cfg80211_propagate_cac_done_wk); + INIT_WORK(&rdev->mgmt_registrations_update_wk, + cfg80211_mgmt_registrations_update_wk); #ifdef CONFIG_CFG80211_DEFAULT_PS rdev->wiphy.flags |= WIPHY_FLAG_PS_ON_BY_DEFAULT; @@ -1047,6 +1049,7 @@ void wiphy_unregister(struct wiphy *wiphy) flush_work(&rdev->sched_scan_stop_wk); flush_work(&rdev->propagate_radar_detect_wk); flush_work(&rdev->propagate_cac_done_wk); + flush_work(&rdev->mgmt_registrations_update_wk); #ifdef CONFIG_PM if (rdev->wiphy.wowlan_config && rdev->ops->set_wakeup) @@ -1108,7 +1111,6 @@ static void __cfg80211_unregister_wdev(struct wireless_dev *wdev, bool sync) rdev->devlist_generation++; cfg80211_mlme_purge_registrations(wdev); - flush_work(&wdev->mgmt_registrations_update_wk); switch (wdev->iftype) { case NL80211_IFTYPE_P2P_DEVICE: @@ -1253,8 +1255,6 @@ void cfg80211_init_wdev(struct cfg80211_registered_device *rdev, spin_lock_init(&wdev->event_lock); INIT_LIST_HEAD(&wdev->mgmt_registrations); spin_lock_init(&wdev->mgmt_registrations_lock); - INIT_WORK(&wdev->mgmt_registrations_update_wk, - cfg80211_mgmt_registrations_update_wk); INIT_LIST_HEAD(&wdev->pmsr_list); spin_lock_init(&wdev->pmsr_lock); INIT_WORK(&wdev->pmsr_free_wk, cfg80211_pmsr_free_wk); |