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mac80211: disable beacons before removing the associated interface 

When downing interfaces, it's a good idea to tell the driver to
stop sending beacons; that way the driver doesn't need special
code in ops->remove_interface() when it should already handle the
case in bss_info_changed().

This fixes a potential crash with at least ath5k since the vif
pointer will be nullified while beacon interrupts are still active.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Bob Copeland 2009-07-29 10:13:03 +02:00 committed by John W. Linville
parent ad2f34b41f
commit 97af743207
3 changed files with 16 additions and 1 deletions
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10
net/mac80211/iface.c
View File

@ -522,6 +522,16 @@ static int ieee80211_stop(struct net_device *dev)
ieee80211_scan_completed(&local->hw, true);
}
/*
* Disable beaconing for AP and mesh, IBSS can't
* still be joined to a network at this point.
*/
if (sdata->vif.type == NL80211_IFTYPE_AP ||
sdata->vif.type == NL80211_IFTYPE_MESH_POINT) {
ieee80211_bss_info_change_notify(sdata,
BSS_CHANGED_BEACON_ENABLED);
}
conf.vif = &sdata->vif;
conf.type = sdata->vif.type;
conf.mac_addr = dev->dev_addr;

3
net/mac80211/main.c
View File

@ -198,7 +198,8 @@ void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
}
if (changed & BSS_CHANGED_BEACON_ENABLED) {
if (test_bit(SCAN_SW_SCANNING, &local->scanning)) {
if (local->quiescing || !netif_running(sdata->dev) ||
test_bit(SCAN_SW_SCANNING, &local->scanning)) {
sdata->vif.bss_conf.enable_beacon = false;
} else {
/*

4
net/mac80211/pm.c
View File

@ -96,6 +96,10 @@ int __ieee80211_suspend(struct ieee80211_hw *hw)
if (!netif_running(sdata->dev))
continue;
/* disable beaconing */
ieee80211_bss_info_change_notify(sdata,
BSS_CHANGED_BEACON_ENABLED);
conf.vif = &sdata->vif;
conf.type = sdata->vif.type;
conf.mac_addr = sdata->dev->dev_addr;