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wifi: mac80211: always hold sdata lock in chanctx assign/unassign

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Due to all the multi-link handling, we now expose the fact that
the sdata/vif is locked to drivers, e.g. when the driver uses
ieee80211_set_monitor_channel(). This was true when a chanctx
is added to or removed from a link, _except_ in monitor mode
with the virtual sdata/vif. Change that, so that drivers can
make that assumption.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230619161906.a5cf7534beda.I5b51664231abee27e02f222083df7ccf88722929@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2023-06-19 16:26:49 +03:00
parent 5c1f97537b
commit 4484de23ba
2 changed files with 18 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
net/mac80211/cfg.c
View File

@ -913,24 +913,30 @@ static int ieee80211_set_monitor_channel(struct wiphy *wiphy,
if (cfg80211_chandef_identical(&local->monitor_chandef, chandef))
return 0;
mutex_lock(&local->mtx);
if (local->use_chanctx) {
sdata = wiphy_dereference(local->hw.wiphy,
local->monitor_sdata);
if (sdata) {
sdata_lock(sdata);
mutex_lock(&local->mtx);
ieee80211_link_release_channel(&sdata->deflink);
ret = ieee80211_link_use_channel(&sdata->deflink,
chandef,
IEEE80211_CHANCTX_EXCLUSIVE);
mutex_unlock(&local->mtx);
sdata_unlock(sdata);
}
} else if (local->open_count == local->monitors) {
local->_oper_chandef = *chandef;
ieee80211_hw_config(local, 0);
} else {
mutex_lock(&local->mtx);
if (local->open_count == local->monitors) {
local->_oper_chandef = *chandef;
ieee80211_hw_config(local, 0);
}
mutex_unlock(&local->mtx);
}
if (ret == 0)
local->monitor_chandef = *chandef;
mutex_unlock(&local->mtx);
return ret;
}

7
net/mac80211/iface.c
View File

@ -1133,6 +1133,7 @@ int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
wiphy_name(local->hw.wiphy));
sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
mutex_init(&sdata->wdev.mtx);
ieee80211_sdata_init(local, sdata);
@ -1157,16 +1158,19 @@ int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
rcu_assign_pointer(local->monitor_sdata, sdata);
mutex_unlock(&local->iflist_mtx);
sdata_lock(sdata);
mutex_lock(&local->mtx);
ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef,
IEEE80211_CHANCTX_EXCLUSIVE);
mutex_unlock(&local->mtx);
sdata_unlock(sdata);
if (ret) {
mutex_lock(&local->iflist_mtx);
RCU_INIT_POINTER(local->monitor_sdata, NULL);
mutex_unlock(&local->iflist_mtx);
synchronize_net();
drv_remove_interface(local, sdata);
mutex_destroy(&sdata->wdev.mtx);
kfree(sdata);
return ret;
}
@ -1202,12 +1206,15 @@ void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
synchronize_net();
sdata_lock(sdata);
mutex_lock(&local->mtx);
ieee80211_link_release_channel(&sdata->deflink);
mutex_unlock(&local->mtx);
sdata_unlock(sdata);
drv_remove_interface(local, sdata);
mutex_destroy(&sdata->wdev.mtx);
kfree(sdata);
}