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| author | James Bottomley <JBottomley@Parallels.com> | 2013-06-26 23:08:22 -0700 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2013-06-26 23:08:22 -0700 |
| commit | a9e94ec3504ead4b87a929bc57f5aa99a6590437 (patch) | |
| tree | b6e7aaec0e844dc066e93296a85e5769542ef525 /net/mac80211/rate.c | |
| parent | 36a279686bc02d340eb213a9f2a0b67e50de64b4 (diff) | |
| parent | 2884d4230867c8a46cf701214051e923301e7429 (diff) | |
Merge tag 'fcoe1' into fixes
This patch fixes a critical bug that was introduced in 3.9
related to VLAN tagging FCoE frames.
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 0d51877efdb..d3f414fe67e 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); |