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authorJohannes Berg <johannes@sipsolutions.net>2008-02-25 16:27:46 +0100
committerJohn W. Linville <linville@tuxdriver.com>2008-03-06 15:30:46 -0500
commitd0709a65181beb787ef3f58cfe45536a2bb254c8 (patch)
tree29e5f36583b0e0a3f11b291347e57672eab41dad /net/mac80211/wme.c
parent5cf121c3cdb955583bf0c5d28c992b7968a4aa1a (diff)
downloadlinux-d0709a65181beb787ef3f58cfe45536a2bb254c8.tar.bz2
mac80211: RCU-ify STA info structure access
This makes access to the STA hash table/list use RCU to protect against freeing of items. However, it's not a true RCU, the copy step is missing: whenever somebody changes a STA item it is simply updated. This is an existing race condition that is now somewhat understandable. This patch also fixes the race key freeing vs. STA destruction by making sure that sta_info_destroy() is always called under RTNL and frees the key. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/wme.c')
-rw-r--r--net/mac80211/wme.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/net/mac80211/wme.c b/net/mac80211/wme.c
index 8cc036decc82..4e94e4026e78 100644
--- a/net/mac80211/wme.c
+++ b/net/mac80211/wme.c
@@ -153,6 +153,7 @@ static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
if (pkt_data->flags & IEEE80211_TXPD_REQUEUE) {
queue = pkt_data->queue;
+ rcu_read_lock();
sta = sta_info_get(local, hdr->addr1);
tid = skb->priority & QOS_CONTROL_TAG1D_MASK;
if (sta) {
@@ -164,8 +165,8 @@ static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
} else {
pkt_data->flags &= ~IEEE80211_TXPD_AMPDU;
}
- sta_info_put(sta);
}
+ rcu_read_unlock();
skb_queue_tail(&q->requeued[queue], skb);
qd->q.qlen++;
return 0;
@@ -187,6 +188,8 @@ static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
p++;
*p = 0;
+ rcu_read_lock();
+
sta = sta_info_get(local, hdr->addr1);
if (sta) {
int ampdu_queue = sta->tid_to_tx_q[tid];
@@ -197,8 +200,9 @@ static int wme_qdiscop_enqueue(struct sk_buff *skb, struct Qdisc* qd)
} else {
pkt_data->flags &= ~IEEE80211_TXPD_AMPDU;
}
- sta_info_put(sta);
}
+
+ rcu_read_unlock();
}
if (unlikely(queue >= local->hw.queues)) {