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net80211: do not allow to unload rate control module if it is still in use.

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Keep 'nrefs' counter up-to-date, so 'kldunload wlan_amrr' with 1+ active
wlan(4) interface will not lead to kernel panic.

MFC after:	5 days
This commit is contained in:
Andriy Voskoboinyk 2017-07-23 22:38:00 +00:00
parent f1b21e2c92
commit 810490a0e2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=321401
2 changed files with 7 additions and 1 deletions
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3
sys/net80211/ieee80211_amrr.c
View File

@ -117,6 +117,7 @@ amrr_init(struct ieee80211vap *vap)
KASSERT(vap->iv_rs == NULL, ("%s called multiple times", __func__));
nrefs++; /* XXX locking */
amrr = vap->iv_rs = IEEE80211_MALLOC(sizeof(struct ieee80211_amrr),
M_80211_RATECTL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
if (amrr == NULL) {
@ -133,6 +134,8 @@ static void
amrr_deinit(struct ieee80211vap *vap)
{
IEEE80211_FREE(vap->iv_rs, M_80211_RATECTL);
KASSERT(nrefs > 0, ("imbalanced attach/detach"));
nrefs--; /* XXX locking */
}
/*

5
sys/net80211/ieee80211_rssadapt.c
View File

@ -130,7 +130,8 @@ rssadapt_init(struct ieee80211vap *vap)
KASSERT(vap->iv_rs == NULL, ("%s: iv_rs already initialized",
__func__));
nrefs++; /* XXX locking */
vap->iv_rs = rs = IEEE80211_MALLOC(sizeof(struct ieee80211_rssadapt),
M_80211_RATECTL, IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
if (rs == NULL) {
@ -146,6 +147,8 @@ static void
rssadapt_deinit(struct ieee80211vap *vap)
{
IEEE80211_FREE(vap->iv_rs, M_80211_RATECTL);
KASSERT(nrefs > 0, ("imbalanced attach/detach"));
nrefs--; /* XXX locking */
}
static void