tree 1defae1fef6cdff58ae0420d4d269d721e5de364
parent d8c17e159758c2a4f8c3319fe8a6cf313f7a6733
author Johannes Berg <johannes@sipsolutions.net> 1207225865 +0200
committer John W. Linville <linville@tuxdriver.com> 1207687481 -0400

mac80211: fix possible sta-debugfs work lockup

Because we queue the sta-debugfs-adding work on our mac80211
workqueue (which needs to be flushed under RTNL) and that work
needs the RTNL, it can currently deadlock, thanks to Reinette
Chatre for pointing out the lockdep warning about this.

This patch fixes it by moving this work to the common kernel
workqueue (using schedule_work) and canceling it as appropriate.

It also fixes a related problem: When a STA is pinned by the
debugfs adding work and sta_info_flush() runs concurrently
it is not guaranteed that all STAs are removed from the driver
before the corresponding interface is removed which may lead
to bugs.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>