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| author | Johannes Berg <johannes@sipsolutions.net> | 2008-02-25 16:27:46 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2008-03-06 15:30:46 -0500 |
| commit | d0709a65181beb787ef3f58cfe45536a2bb254c8 (patch) | |
| tree | 29e5f36583b0e0a3f11b291347e57672eab41dad /net/mac80211/wme.c | |
| parent | 5cf121c3cdb955583bf0c5d28c992b7968a4aa1a (diff) | |
| download | op-kernel-dev-d0709a65181beb787ef3f58cfe45536a2bb254c8.zip op-kernel-dev-d0709a65181beb787ef3f58cfe45536a2bb254c8.tar.gz | |
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.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/mac80211/wme.c b/net/mac80211/wme.c index 8cc036d..4e94e40 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)) { |
