mac80211: add channel context iterator
Drivers may need to iterate the active channel
contexts, export an iterator function to allow
that. To make it possible, use RCU-safe list
functions.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index bfaa486..f84b860 100644
--- a/net/mac80211/chan.c
+++ b/net/mac80211/chan.c
@@ -3,6 +3,7 @@
*/
#include <linux/nl80211.h>
+#include <linux/export.h>
#include <net/cfg80211.h>
#include "ieee80211_i.h"
#include "driver-ops.h"
@@ -134,7 +135,7 @@
}
}
- list_add(&ctx->list, &local->chanctx_list);
+ list_add_rcu(&ctx->list, &local->chanctx_list);
return ctx;
}
@@ -153,7 +154,7 @@
drv_remove_chanctx(local, ctx);
}
- list_del(&ctx->list);
+ list_del_rcu(&ctx->list);
kfree_rcu(ctx, rcu_head);
}
@@ -379,3 +380,20 @@
__ieee80211_vif_release_channel(sdata);
mutex_unlock(&sdata->local->chanctx_mtx);
}
+
+void ieee80211_iter_chan_contexts_atomic(
+ struct ieee80211_hw *hw,
+ void (*iter)(struct ieee80211_hw *hw,
+ struct ieee80211_chanctx_conf *chanctx_conf,
+ void *data),
+ void *iter_data)
+{
+ struct ieee80211_local *local = hw_to_local(hw);
+ struct ieee80211_chanctx *ctx;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(ctx, &local->chanctx_list, list)
+ iter(hw, &ctx->conf, iter_data);
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(ieee80211_iter_chan_contexts_atomic);
