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mac80211: add interface list lock

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Using only the RTNL has a number of problems, most notably that
ieee80211_iterate_active_interfaces() and other interface list
traversals cannot be done from the internal workqueue because it
needs to be flushed under the RTNL.

This patch introduces a new mutex that protects the interface list
against modifications. A more detailed explanation is part of the
code change.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
2009-01-23 22:54:03 +01:00
committed by John W. Linville
parent 506d03f97d
commit c771c9d8da
5 changed files with 40 additions and 5 deletions
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3
net/mac80211/main.c
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@@ -758,6 +758,7 @@ struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
local->hw.conf.radio_enabled = true;
INIT_LIST_HEAD(&local->interfaces);
mutex_init(&local->iflist_mtx);
spin_lock_init(&local->key_lock);
@@ -1008,6 +1009,8 @@ void ieee80211_free_hw(struct ieee80211_hw *hw)
{
struct ieee80211_local *local = hw_to_local(hw);
mutex_destroy(&local->iflist_mtx);
wiphy_free(local->hw.wiphy);
}
EXPORT_SYMBOL(ieee80211_free_hw);