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authorJohannes Berg <johannes.berg@intel.com>2012-09-11 17:57:42 +0200
committerJohannes Berg <johannes.berg@intel.com>2012-10-17 11:02:10 +0200
commit3448c0058327356049f140116fc6632bbfd0c122 (patch)
treed7cd9c0889c79a978a8c7bfd76dc9eefaa5f87a8 /net
parent04ecd2578e712c301fa1369d2a8f298a2b4b146a (diff)
downloadlinux-3448c0058327356049f140116fc6632bbfd0c122.tar.bz2
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>
Diffstat (limited to 'net')
-rw-r--r--net/mac80211/chan.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/net/mac80211/chan.c b/net/mac80211/chan.c
index bfaa486d928c..f84b86028a9c 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 @@ ieee80211_new_chanctx(struct ieee80211_local *local,
}
}
- list_add(&ctx->list, &local->chanctx_list);
+ list_add_rcu(&ctx->list, &local->chanctx_list);
return ctx;
}
@@ -153,7 +154,7 @@ static void ieee80211_free_chanctx(struct ieee80211_local *local,
drv_remove_chanctx(local, ctx);
}
- list_del(&ctx->list);
+ list_del_rcu(&ctx->list);
kfree_rcu(ctx, rcu_head);
}
@@ -379,3 +380,20 @@ void ieee80211_vif_release_channel(struct ieee80211_sub_if_data *sdata)
__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);