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Wrap the rate control re-init code in a lock, to serialise it with

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concurrent updates from any completing transmits in other threads.

This was exposed when doing power save work - net80211 is constantly
doing reassociations and it's causing the rate control state to get
blanked out.  This could cause the rate control code to assert.

This should be MFCed to stable/10 as it's a stability fix.

Tested:

* AR5416, STA

MFC after:	7 days
This commit is contained in:
Adrian Chadd 2014-04-23 05:19:45 +00:00
parent 2809a6dfa4
commit 656380e725
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=264798
1 changed files with 2 additions and 0 deletions
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sys/dev/ath/if_ath.c
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@ -5567,7 +5567,9 @@ ath_newassoc(struct ieee80211_node *ni, int isnew)
an->an_mcastrix = ath_tx_findrix(sc, tp->mcastrate);
an->an_mgmtrix = ath_tx_findrix(sc, tp->mgmtrate);
ATH_NODE_LOCK(an);
ath_rate_newassoc(sc, an, isnew);
ATH_NODE_UNLOCK(an);
if (isnew &&
(vap->iv_flags & IEEE80211_F_PRIVACY) == 0 && sc->sc_hasclrkey &&