#1917: WDS related race condition with UASPD_TRIG
----------------------------------+-----------------------------------------
Reporter: [EMAIL PROTECTED] | Type: defect
Status: new | Priority: minor
Component: madwifi: other | Version: v0.9.4
Keywords: | Patch_attached: 0
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I found another deadlock in 0.9.4.
Here is the stack trace. Since this happens in the interrupt handler, it
kills the machine. So this is hand written, not cut and paste:
{{{
node_cleanup
ath_node_cleanup
node_free
_ieee80211_free_node
ieee80211_free_node
ath_tx_processq
ath_tx_tasklets
tasklet_action
...
}}}
ieee80211_free_node() locks ic.
node_cleanup also locks ni->ni_ic, in the following code fragment:
{{{
if (ni->ni_flags & IEEE80211_NODE_UAPSD_TRIG) {
ni->ni_flags &= ~IEEE80211_NODE_UAPSD_TRIG;
IEEE80211_LOCK_IRQ(ni->ni_ic);
ni->ni_ic->ic_uapsdmaxtriggers--;
IEEE80211_UNLOCK_IRQ(ni->ni_ic);
}}}
--
Ticket URL: <http://madwifi.org/ticket/1917>
madwifi.org <http://madwifi.org/>
Multiband Atheros Driver for Wireless Fidelity
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