netdev - [PATCH RFC v1 1/7] mac80211: Add stations iterator where the iterator function may sleep

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Date:   Sat, 17 Jul 2021 22:40:51 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     linux-wireless@...r.kernel.org
Cc:     tony0620emma@...il.com, kvalo@...eaurora.org,
        johannes@...solutions.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Neo Jou <neojou@...il.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH RFC v1 1/7] 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@...glemail.com>
---
 include/net/mac80211.h | 18 ++++++++++++++++++
 net/mac80211/util.c    | 13 +++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/include/net/mac80211.h b/include/net/mac80211.h
index d8a1d09a2141..77de89690008 100644
--- a/include/net/mac80211.h
+++ b/include/net/mac80211.h
@@ -5575,6 +5575,24 @@ void ieee80211_iterate_active_interfaces_mtx(struct ieee80211_hw *hw,
 						struct ieee80211_vif *vif),
 					     void *data);
 
+/**
+ * ieee80211_iterate_stations_atomic - 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
  *
diff --git a/net/mac80211/util.c b/net/mac80211/util.c
index 05e96212b104..c6984d0464f2 100644
--- a/net/mac80211/util.c
+++ b/net/mac80211/util.c
@@ -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),
-- 
2.32.0