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| author | Johannes Berg <johannes@sipsolutions.net> | 2009-08-17 12:25:37 +0200 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2009-08-20 11:35:56 -0400 |
| commit | 0ff6ce7b36199f67f709c750e9a2a66659a4babe (patch) | |
| tree | 3b023b960e010b7ce84d35d8e9b516f5cb285f77 /scripts/genksyms | |
| parent | 96909e97716de1d86e6e24d6aabce09980372771 (diff) | |
| download | linux-0ff6ce7b36199f67f709c750e9a2a66659a4babe.tar.bz2 | |
cfg80211: fix deadlock
When removing an interface with nl80211, cfg80211 will
deadlock in the netdev notifier because we're already
holding rdev->mtx and try to acquire it again to verify
the scan has been done.
This bug was introduced by my patch
"cfg80211: check for and abort dangling scan requests".
To fix this, move the dangling scan request check into
wiphy_unregister(). This will not be able to catch all
cases right away, but if the scan problem happens with
a manual ifdown or so it will be possible to remedy it
by removing the module/device.
Additionally, add comments about the deadlock scenario.
Reported-by: Christian Lamparter <chunkeey@web.de>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Tested-by: Christian Lamparter <chunkeey@web.de>
Tested-by: Kalle Valo <kalle.valo@iki.fi>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'scripts/genksyms')
0 files changed, 0 insertions, 0 deletions