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authorJohannes Berg <johannes.berg@intel.com>2010-08-27 13:45:28 +0200
committerJohn W. Linville <linville@tuxdriver.com>2010-08-27 13:53:31 -0400
commit5b714c6a3753dad0798a70a049e15c7f6bc9446b (patch)
tree39345981014b14e881cbfbef87a4a3a74469fada /net/mac80211/offchannel.c
parentc35d02705e9c2db90a89b29142046b4ffd5a76e5 (diff)
mac80211: fix offchannel queue stop
Somebody noticed this problem, and I outlined to them how to fix it, but haven't heard back from them. So while I was adding the state field I figured I could use it to fix it. The problem, as I understand it, is that when we go offchannel while the driver has a queue stopped, the driver will likely start draining the queue and then enable it while offchannel. This in turn will enable the interface queue, and that leads to transmitting data frames on the wrong channel. Fix this by keeping track of offchannel status per interface, and not enabling the interface queues on interfaces that are offchannel when the driver enables a queue. Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/offchannel.c')
-rw-r--r--net/mac80211/offchannel.c19
1 files changed, 17 insertions, 2 deletions
diff --git a/net/mac80211/offchannel.c b/net/mac80211/offchannel.c
index c36b1911987..eeacaa59380 100644
--- a/net/mac80211/offchannel.c
+++ b/net/mac80211/offchannel.c
@@ -112,8 +112,10 @@ void ieee80211_offchannel_stop_beaconing(struct ieee80211_local *local)
* used from user space controlled off-channel operations.
*/
if (sdata->vif.type != NL80211_IFTYPE_STATION &&
- sdata->vif.type != NL80211_IFTYPE_MONITOR)
+ sdata->vif.type != NL80211_IFTYPE_MONITOR) {
+ set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
netif_tx_stop_all_queues(sdata->dev);
+ }
}
mutex_unlock(&local->iflist_mtx);
}
@@ -131,6 +133,7 @@ void ieee80211_offchannel_stop_station(struct ieee80211_local *local)
continue;
if (sdata->vif.type == NL80211_IFTYPE_STATION) {
+ set_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
netif_tx_stop_all_queues(sdata->dev);
if (sdata->u.mgd.associated)
ieee80211_offchannel_ps_enable(sdata);
@@ -155,8 +158,20 @@ void ieee80211_offchannel_return(struct ieee80211_local *local,
ieee80211_offchannel_ps_disable(sdata);
}
- if (sdata->vif.type != NL80211_IFTYPE_MONITOR)
+ if (sdata->vif.type != NL80211_IFTYPE_MONITOR) {
+ clear_bit(SDATA_STATE_OFFCHANNEL, &sdata->state);
+ /*
+ * This may wake up queues even though the driver
+ * currently has them stopped. This is not very
+ * likely, since the driver won't have gotten any
+ * (or hardly any) new packets while we weren't
+ * on the right channel, and even if it happens
+ * it will at most lead to queueing up one more
+ * packet per queue in mac80211 rather than on
+ * the interface qdisc.
+ */
netif_tx_wake_all_queues(sdata->dev);
+ }
/* re-enable beaconing */
if (enable_beaconing &&