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mac80211: Add RTNL warning for workqueue

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The workqueue provided by mac80211 should not be used for
scheduled tasks that acquire the RTNL lock. This could be done
when the driver uses the function ieee80211_iterate_active_interfaces()
within the scheduled work. Such behavior will end in locking
dependencies problems when an interface is being removed.

This patch will add a notification about the RTNL locking and
the mac80211 workqueue to prevent driver developers from
blindly using it.

Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Ivo van Doorn 2008-06-24 19:23:36 +02:00 committed by John W. Linville
parent f37d08bddc
commit 428da76523
1 changed files with 5 additions and 2 deletions
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7
include/net/mac80211.h
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@ -738,8 +738,11 @@ enum ieee80211_hw_flags {
* @conf: &struct ieee80211_conf, device configuration, don't use.
*
* @workqueue: single threaded workqueue available for driver use,
* allocated by mac80211 on registration and flushed on
* unregistration.
* 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())
*
* @priv: pointer to private area that was allocated for driver use
* along with this structure.