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authorJohannes Berg <johannes.berg@intel.com>2010-06-10 10:21:38 +0200
committerJohn W. Linville <linville@tuxdriver.com>2010-06-14 15:39:27 -0400
commita87f736d942c86255e3088c606f0e3eab6bbf784 (patch)
tree74d3d63dca9fc982fcb7c165247d6924c021b4ef /net/mac80211/debugfs_sta.c
parentc1475ca99edcc7216ddc45838ab2c3281c14ba22 (diff)
downloadblackbird-op-linux-a87f736d942c86255e3088c606f0e3eab6bbf784.tar.gz
blackbird-op-linux-a87f736d942c86255e3088c606f0e3eab6bbf784.zip
mac80211: use RCU for RX aggregation
Currently we allocate some memory for each RX aggregation session and additionally keep a flag indicating whether or not it is valid. By using RCU to protect the pointer and making sure that the memory is fully set up before it becomes visible to the RX path, we can remove the need for the bool that indicates validity, as well as for locking on the RX path since it is always synchronised against itself, and we can guarantee that all other modifications are done when the structure is not visible to the RX path. The net result is that since we remove locking requirements from the RX path, we can in the future use any kind of lock for the setup and teardown code paths. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/debugfs_sta.c')
-rw-r--r--net/mac80211/debugfs_sta.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/mac80211/debugfs_sta.c b/net/mac80211/debugfs_sta.c
index 576e024715e3..95c1ea47ad35 100644
--- a/net/mac80211/debugfs_sta.c
+++ b/net/mac80211/debugfs_sta.c
@@ -125,12 +125,12 @@ static ssize_t sta_agg_status_read(struct file *file, char __user *userbuf,
for (i = 0; i < STA_TID_NUM; i++) {
p += scnprintf(p, sizeof(buf) + buf - p, "%02d", i);
p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x",
- sta->ampdu_mlme.tid_active_rx[i]);
+ !!sta->ampdu_mlme.tid_rx[i]);
p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.2x",
- sta->ampdu_mlme.tid_active_rx[i] ?
+ sta->ampdu_mlme.tid_rx[i] ?
sta->ampdu_mlme.tid_rx[i]->dialog_token : 0);
p += scnprintf(p, sizeof(buf) + buf - p, "\t%#.3x",
- sta->ampdu_mlme.tid_active_rx[i] ?
+ sta->ampdu_mlme.tid_rx[i] ?
sta->ampdu_mlme.tid_rx[i]->ssn : 0);
p += scnprintf(p, sizeof(buf) + buf - p, "\t\t%x",
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