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| author | Felix Fietkau <nbd@openwrt.org> | 2013-05-03 10:01:03 +0200 |
|---|---|---|
| committer | Johannes Berg <johannes.berg@intel.com> | 2013-05-16 22:38:05 +0200 |
| commit | f6b3d85f7f6d66f890862d763b2ed092c5dd4322 (patch) | |
| tree | 3e6ca47a09a6ee3418aa2ab14d14d3534c2b9279 /net/mac80211/rate.c | |
| parent | 3670946fe2e942bcb09ec9bbc587bf305f9f97da (diff) | |
| download | op-kernel-dev-f6b3d85f7f6d66f890862d763b2ed092c5dd4322.zip op-kernel-dev-f6b3d85f7f6d66f890862d763b2ed092c5dd4322.tar.gz | |
mac80211: fix spurious RCU warning and update documentation
Document rx vs tx status concurrency requirements.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/mac80211/rate.c')
| -rw-r--r-- | net/mac80211/rate.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/net/mac80211/rate.c b/net/mac80211/rate.c index 0d51877..d3f414f 100644 --- a/net/mac80211/rate.c +++ b/net/mac80211/rate.c @@ -688,8 +688,15 @@ int rate_control_set_rates(struct ieee80211_hw *hw, struct ieee80211_sta *pubsta, struct ieee80211_sta_rates *rates) { - struct ieee80211_sta_rates *old = rcu_dereference(pubsta->rates); + struct ieee80211_sta_rates *old; + /* + * mac80211 guarantees that this function will not be called + * concurrently, so the following RCU access is safe, even without + * extra locking. This can not be checked easily, so we just set + * the condition to true. + */ + old = rcu_dereference_protected(pubsta->rates, true); rcu_assign_pointer(pubsta->rates, rates); if (old) kfree_rcu(old, rcu_head); |
