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wifi: mac80211: Add non-atomic station iterator

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Drivers may at times want to iterate their stations with a function
which requires some non-atomic operations.

ieee80211_iterate_stations_mtx() introduces an API to iterate stations
while holding that wiphy's mutex. This allows the iterating function to
do non-atomic operations safely.

Signed-off-by: Rory Little <rory@candelatech.com>
Link: https://patch.msgid.link/20240806004024.2014080-2-rory@candelatech.com
[unify internal list iteration functions]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Rory Little 2024-08-05 17:40:23 -07:00 committed by Johannes Berg
parent 6a1a6f2dba
commit 7c3b69eade
2 changed files with 33 additions and 1 deletions
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18
include/net/mac80211.h
View File

@ -6243,6 +6243,24 @@ void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
void (*iterator)(void *data,
struct ieee80211_sta *sta),
void *data);
/**
* ieee80211_iterate_stations_mtx - iterate stations
*
* This function iterates over all stations associated with a given
* hardware that are currently uploaded to the driver and calls the callback
* function for them. This version can only be used while holding the wiphy
* mutex.
*
* @hw: the hardware struct of which the interfaces should be iterated over
* @iterator: the iterator function to call
* @data: first argument of the iterator function
*/
void ieee80211_iterate_stations_mtx(struct ieee80211_hw *hw,
void (*iterator)(void *data,
struct ieee80211_sta *sta),
void *data);
/**
* ieee80211_queue_work - add work onto the mac80211 workqueue
*

16
net/mac80211/util.c
View File

@ -833,7 +833,8 @@ static void __iterate_stations(struct ieee80211_local *local,
{
struct sta_info *sta;
list_for_each_entry_rcu(sta, &local->sta_list, list) {
list_for_each_entry_rcu(sta, &local->sta_list, list,
lockdep_is_held(&local->hw.wiphy->mtx)) {
if (!sta->uploaded)
continue;
@ -854,6 +855,19 @@ void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
}
EXPORT_SYMBOL_GPL(ieee80211_iterate_stations_atomic);
void ieee80211_iterate_stations_mtx(struct ieee80211_hw *hw,
void (*iterator)(void *data,
struct ieee80211_sta *sta),
void *data)
{
struct ieee80211_local *local = hw_to_local(hw);
lockdep_assert_wiphy(local->hw.wiphy);
__iterate_stations(local, iterator, data);
}
EXPORT_SYMBOL_GPL(ieee80211_iterate_stations_mtx);
struct ieee80211_vif *wdev_to_ieee80211_vif(struct wireless_dev *wdev)
{
struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);