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net80211: fix possible panic when wlan(4) interface is destroyed.

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If this is the last running vap wait until device will be powered off
(fixes panic when 'ifconfig wlan0 destroy' is executed for running iwn(4)
interface).

Tested with:
 - Intel 6205, STA mode.
 - RTL8188EU, STA / IBSS modes.
 - RTL8821AU, STA / HOSTAP modes.
This commit is contained in:
Andriy Voskoboinyk 2017-03-24 22:29:51 +00:00
parent 4e501eb7cc
commit e2db307ebc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=315917
1 changed files with 1 additions and 0 deletions
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sys/net80211/ieee80211.c
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@ -728,6 +728,7 @@ ieee80211_vap_detach(struct ieee80211vap *vap)
ieee80211_draintask(ic, &vap->iv_nstate_task);
ieee80211_draintask(ic, &vap->iv_swbmiss_task);
ieee80211_draintask(ic, &vap->iv_wme_task);
ieee80211_draintask(ic, &ic->ic_parent_task);
/* XXX band-aid until ifnet handles this for us */
taskqueue_drain(taskqueue_swi, &ifp->if_linktask);