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mac80211: Add stations iterator where the iterator function may sleep

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ieee80211_iterate_active_interfaces() and
ieee80211_iterate_active_interfaces_atomic() already exist, where the
former allows the iterator function to sleep. Add
ieee80211_iterate_stations() which is similar to
ieee80211_iterate_stations_atomic() but allows the iterator to sleep.
This is needed for adding SDIO support to the rtw88 driver. Some
interators there are reading or writing registers. With the SDIO ops
(sdio_readb, sdio_writeb and friends) this means that the iterator
function may sleep.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Link: https://lore.kernel.org/r/20211228211501.468981-2-martin.blumenstingl@googlemail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Martin Blumenstingl 2021-12-28 22:14:53 +01:00 committed by Johannes Berg
parent 04be6d337d
commit acb99b9b2a
2 changed files with 34 additions and 0 deletions
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21
include/net/mac80211.h
View File

@ -5614,6 +5614,9 @@ void ieee80211_iterate_active_interfaces_atomic(struct ieee80211_hw *hw,
* This function iterates over the interfaces associated with a given
* hardware that are currently active and calls the callback for them.
* This version can only be used while holding the wiphy mutex.
* The driver must not call this with a lock held that it can also take in
* response to callbacks from mac80211, and it must not call this within
* callbacks made by mac80211 - both would result in deadlocks.
*
* @hw: the hardware struct of which the interfaces should be iterated over
* @iter_flags: iteration flags, see &enum ieee80211_interface_iteration_flags
@ -5627,6 +5630,24 @@ void ieee80211_iterate_active_interfaces_mtx(struct ieee80211_hw *hw,
struct ieee80211_vif *vif),
void *data);
/**
* ieee80211_iterate_stations - 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 function allows the iterator function to sleep, when the iterator
* function is atomic @ieee80211_iterate_stations_atomic can be used.
*
* @hw: the hardware struct of which the interfaces should be iterated over
* @iterator: the iterator function to call, cannot sleep
* @data: first argument of the iterator function
*/
void ieee80211_iterate_stations(struct ieee80211_hw *hw,
void (*iterator)(void *data,
struct ieee80211_sta *sta),
void *data);
/**
* ieee80211_iterate_stations_atomic - iterate stations
*

13
net/mac80211/util.c
View File

@ -862,6 +862,19 @@ static void __iterate_stations(struct ieee80211_local *local,
}
}
void ieee80211_iterate_stations(struct ieee80211_hw *hw,
void (*iterator)(void *data,
struct ieee80211_sta *sta),
void *data)
{
struct ieee80211_local *local = hw_to_local(hw);
mutex_lock(&local->sta_mtx);
__iterate_stations(local, iterator, data);
mutex_unlock(&local->sta_mtx);
}
EXPORT_SYMBOL_GPL(ieee80211_iterate_stations);
void ieee80211_iterate_stations_atomic(struct ieee80211_hw *hw,
void (*iterator)(void *data,
struct ieee80211_sta *sta),