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bc05d19f4b
linux/net/mac80211
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Johannes Berg bc05d19f4b mac80211: fix IBSS lockdep complaint 
Bob reported a lockdep complaint originating in
the mac80211 IBSS code due to the common work
struct patch. The reason is that the IBSS and
station mode code have different locking orders
for the cfg80211 wdev lock and the work struct
(where "locking" implies running/canceling).

Fix this by simply not canceling the work in
the IBSS code, it is not necessary since when
the REQ_RUN bit is cleared, the work will run
without effect if it runs. When the interface
is set down, it is flushed anyway, so there's
no concern about it running after memory has
been invalidated either.

This fixes
https://bugzilla.kernel.org/show_bug.cgi?id=16419

Additionally, looking into this I noticed that
there's a small window while the IBSS is torn
down in which the work may be rescheduled and
the REQ_RUN bit be set again after leave() has
cleared it when a scan finishes at exactly the
same time. Avoid that by setting the ssid_len
to zero before clearing REQ_RUN which signals
to the scan finish code that this interface is
not active.

Reported-by: Bob Copeland <me@bobcopeland.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
2010-07-21 15:13:42 -04:00
..
aes_ccm.c
aes_ccm.h
aes_cmac.c mac80211: 802.11w - Add BIP (AES-128-CMAC) 2009-01-29 16:00:02 -05:00
aes_cmac.h mac80211: 802.11w - Add BIP (AES-128-CMAC) 2009-01-29 16:00:02 -05:00
agg-rx.c mac80211: update aggregation documentation 2010-06-14 15:39:28 -04:00
agg-tx.c mac80211: update aggregation documentation 2010-06-14 15:39:28 -04:00
cfg.c mac80211: move QoS-enable to BSS info 2010-07-20 16:02:58 -04:00
cfg.h
chan.c mac80211: make a function static 2010-05-28 13:41:27 -04:00
debugfs_key.c mac80211: Use a separate CCMP PN receive counter for management frames 2010-06-15 16:00:49 -04:00
debugfs_key.h mac80211: 802.11w - Use BIP (AES-128-CMAC) 2009-01-29 16:00:03 -05:00
debugfs_netdev.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem 2010-04-15 16:21:34 -04:00
debugfs_netdev.h mac80211: reduce reliance on netdev 2009-12-21 18:38:52 -05:00
debugfs_sta.c mac80211: make TX aggregation start/stop request async 2010-06-14 15:39:27 -04:00
debugfs_sta.h
debugfs.c mac80211: reduce debugfs code size 2010-06-03 14:14:41 -04:00
debugfs.h net: Remove unnecessary returns from void function()s 2010-05-17 23:23:14 -07:00
driver-ops.h mac80211: add basic tracing to drv_get_survey 2010-06-29 14:51:23 -04:00
driver-trace.c mac80211: fix sparse warnings/errors 2009-08-04 16:43:25 -04:00
driver-trace.h mac80211: add basic tracing to drv_get_survey 2010-06-29 14:51:23 -04:00
event.c cfg80211: use proper allocation flags 2009-07-10 15:01:49 -04:00
ht.c mac80211: skip HT parsing if HW does not support HT 2010-07-16 14:03:42 -04:00
ibss.c mac80211: fix IBSS lockdep complaint 2010-07-21 15:13:42 -04:00
ieee80211_i.h mac80211: Add interface for driver to temporarily disable dynamic ps 2010-06-21 15:39:59 -04:00
iface.c mac80211: set carrier on for monitor interfaces on ieee80211_open 2010-07-20 16:02:58 -04:00
Kconfig mac82011: Allow selection of minstrel_ht as default rc algorithm 2010-06-30 15:00:53 -04:00
key.c mac80211: Use a separate CCMP PN receive counter for management frames 2010-06-15 16:00:49 -04:00
key.h mac80211: Use a separate CCMP PN receive counter for management frames 2010-06-15 16:00:49 -04:00
led.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
led.h
main.c mac80211: remove wep dependency 2010-07-08 16:35:50 -04:00
Makefile mac80211: add the minstrel_ht rate control algorithm 2010-06-02 16:12:59 -04:00
mesh_hwmp.c mac80211: use common work struct 2010-06-14 15:38:17 -04:00
mesh_pathtbl.c mac80211: use common work struct 2010-06-14 15:38:17 -04:00
mesh_plink.c mac80211: avoid scheduling while atomic in mesh_rx_plink_frame 2010-06-24 15:42:30 -04:00
mesh.c mac80211: pull mgmt frame rx into rx handler 2010-06-14 15:39:26 -04:00
mesh.h mac80211: pull mgmt frame rx into rx handler 2010-06-14 15:39:26 -04:00
michael.c
michael.h
mlme.c mac80211: refuse shared key auth when WEP is unavailable 2010-07-21 15:13:42 -04:00
offchannel.c mac80211: Fixed netif_tx_wake_all_queues in IBSS mode 2010-01-15 16:58:28 -05:00
pm.c mac80211: use common work struct 2010-06-14 15:38:17 -04:00
rate.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
rate.h mac80211: add the minstrel_ht rate control algorithm 2010-06-02 16:12:59 -04:00
rc80211_minstrel_debugfs.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-04-11 14:53:53 -07:00
rc80211_minstrel_ht_debugfs.c minstrel_ht: move minstrel_mcs_groups declaration to header file 2010-06-24 15:42:18 -04:00
rc80211_minstrel_ht.c minstrel_ht: fix check for downgrading of top2 rate 2010-07-02 13:44:40 -04:00
rc80211_minstrel_ht.h minstrel_ht: move minstrel_mcs_groups declaration to header file 2010-06-24 15:42:18 -04:00
rc80211_minstrel.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-04-11 14:53:53 -07:00
rc80211_minstrel.h minstrel: make the rate control ops reusable from another rc implementation 2010-03-10 17:44:23 -05:00
rc80211_pid_algo.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
rc80211_pid_debugfs.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
rc80211_pid.h
rx.c mac80211: use netif_receive_skb in ieee80211_rx callpath 2010-06-28 15:14:51 -04:00
scan.c mac80211: Fix compile warning in scan.c. 2010-06-21 15:39:59 -04:00
spectmgmt.c mac80211: reduce reliance on netdev 2009-12-21 18:38:52 -05:00
sta_info.c mac80211: change RX aggregation locking 2010-06-14 15:39:28 -04:00
sta_info.h mac80211: fix the for_each_sta_info macro 2010-06-28 15:16:20 -04:00
status.c mac80211: use netif_receive_skb in ieee80211_tx_status callpath 2010-06-28 15:14:51 -04:00
tkip.c mac80211: remove wep dependency 2010-07-08 16:35:50 -04:00
tkip.h mac80211: remove wep dependency 2010-07-08 16:35:50 -04:00
tx.c mac80211: make TX aggregation start/stop request async 2010-06-14 15:39:27 -04:00
util.c mac80211: move QoS-enable to BSS info 2010-07-20 16:02:58 -04:00
wep.c mac80211: improve error checking if WEP fails to init 2010-07-16 14:03:42 -04:00
wep.h mac80211: remove wep dependency 2010-07-08 16:35:50 -04:00
wme.c mac80211: fix-up build breakage in 2.6.33 2010-01-06 15:35:49 -05:00
wme.h mac80211: fix skb buffering issue 2010-01-05 16:21:40 -05:00
work.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-2.6 2010-06-17 16:21:14 -04:00
wpa.c mac80211: remove wep dependency 2010-07-08 16:35:50 -04:00
wpa.h mac80211: 802.11w - Add BIP (AES-128-CMAC) 2009-01-29 16:00:02 -05:00