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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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2
net/mac80211/ieee80211_i.h
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@@ -643,7 +643,9 @@ struct ieee80211_local {
struct crypto_blkcipher *wep_rx_tfm;
u32 wep_iv;
/* see iface.c */
struct list_head interfaces;
struct mutex iflist_mtx;
/*
* Key lock, protects sdata's key_list and sta_info's