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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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5
include/net/mac80211.h
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@ -928,9 +928,8 @@ enum ieee80211_hw_flags {
* @workqueue: single threaded workqueue available for driver use,
* allocated by mac80211 on registration and flushed when an
* interface is removed.
* NOTICE: All work performed on this workqueue should NEVER
* acquire the RTNL lock (i.e. Don't use the function
* ieee80211_iterate_active_interfaces())
* NOTICE: All work performed on this workqueue must not
* acquire the RTNL lock.
*
* @priv: pointer to private area that was allocated for driver use
* along with this structure.