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authorMartin Blumenstingl <martin.blumenstingl@googlemail.com>2021-12-28 22:14:53 +0100
committerJohannes Berg <johannes.berg@intel.com>2022-01-04 15:47:15 +0100
commitacb99b9b2a08f439a13eafffd2a59b798d983462 (patch)
tree4c6e2bd002d5bd4203cebac0806dc945c8e125fe /include/net
parent04be6d337d37400ad5b3d5f27ca87645ee5a18a3 (diff)
downloadlinux-acb99b9b2a08f439a13eafffd2a59b798d983462.tar.bz2
mac80211: Add stations iterator where the iterator function may sleep
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>
Diffstat (limited to 'include/net')
-rw-r--r--include/net/mac80211.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index 8907338d52b5..c50221d7e82c 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -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
@@ -5628,6 +5631,24 @@ void ieee80211_iterate_active_interfaces_mtx(struct ieee80211_hw *hw,
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
*
* This function iterates over all stations associated with a given