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mac80211: make ieee80211_iterate_active_interfaces not need rtnl 

Interface iteration in mac80211 can be done without holding any
locks because I converted it to RCU. Initially, I thought this
wouldn't be needed for ieee80211_iterate_active_interfaces but
it's turning out that multi-BSS AP support can be much simpler
in a driver if ieee80211_iterate_active_interfaces can be called
without holding locks. This converts it to use RCU, it adds a
requirement that the callback it invokes cannot sleep.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg 2007-11-28 10:55:32 +01:00 committed by David S. Miller
parent 76ee65bfaa
commit e38bad4766
2 changed files with 5 additions and 5 deletions
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3
include/net/mac80211.h
View File

@ -1411,10 +1411,9 @@ void ieee80211_scan_completed(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.
* Must be called under RTNL.
*
* @hw: the hardware struct of which the interfaces should be iterated over
* @iterator: the iterator function to call
* @iterator: the iterator function to call, cannot sleep
* @data: first argument of the iterator function
*/
void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,

7
net/mac80211/util.c
View File

@ -482,10 +482,9 @@ void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,
struct ieee80211_local *local = hw_to_local(hw);
struct ieee80211_sub_if_data *sdata;
ASSERT_RTNL();
rcu_read_lock();
/* we hold the RTNL here so can safely walk the list */
list_for_each_entry(sdata, &local->interfaces, list) {
list_for_each_entry_rcu(sdata, &local->interfaces, list) {
switch (sdata->type) {
case IEEE80211_IF_TYPE_INVALID:
case IEEE80211_IF_TYPE_MNTR:
@ -503,5 +502,7 @@ void ieee80211_iterate_active_interfaces(struct ieee80211_hw *hw,
iterator(data, sdata->dev->dev_addr,
sdata->dev->ifindex);
}
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(ieee80211_iterate_active_interfaces);