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mac80211: fix spurious RCU warning and update documentation

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Document rx vs tx status concurrency requirements.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Felix Fietkau
2013-05-03 10:01:03 +02:00
committed by Johannes Berg
parent 3670946fe2
commit f6b3d85f7f
2 changed files with 16 additions and 5 deletions
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9
net/mac80211/rate.c
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@@ -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);