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| /freebsd-11-stable/sys/dev/ath/ | ||
| H A D | if_ath_tx.c | diff 235774 Tue May 22 04:36:59 MDT 2012 adrian Fix up some corner cases with aggregation handling. I've come across a weird scenario in net80211 where two TX streams will happily attempt to setup an aggregation session together. If we're very lucky, it happens concurrently on separate CPUs and the total lack of locking in the net80211 aggregation code causes this stuff to race. Badly. So >1 call would occur to the ath(4) addba start, but only one call would complete to addba complete or timeout. The TID would thus stay paused. The real fix is to implement some proper per-node (or maybe per-TID) locking in net80211, which then could be leveraged by the ath(4) TX aggregation code. Whilst I'm at it, shuffle around the debugging messages a bit. I like to keep people on their toes. |
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