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Marcel Holtmann a67e899cf3 Bluetooth: Fix issue with sysfs handling for connections 
Due to a semantic changes in flush_workqueue() the current approach of
synchronizing the sysfs handling for connections doesn't work anymore. The
whole approach is actually fully broken and based on assumptions that are
no longer valid.

With the introduction of Simple Pairing support, the creation of low-level
ACL links got changed. This change invalidates the reason why in the past
two independent work queues have been used for adding/removing sysfs
devices. The adding of the actual sysfs device is now postponed until the
host controller successfully assigns an unique handle to that link. So
the real synchronization happens inside the controller and not the host.

The only left-over problem is that some internals of the sysfs device
handling are not initialized ahead of time. This leaves potential access
to invalid data and can cause various NULL pointer dereferences. To fix
this a new function makes sure that all sysfs details are initialized
when an connection attempt is made. The actual sysfs device is only
registered when the connection has been successfully established. To
avoid a race condition with the registration, the check if a device is
registered has been moved into the removal work.

As an extra protection two flush_work() calls are left in place to
make sure a previous add/del work has been completed first.

Based on a report by Marc Pignat <marc.pignat@hevs.ch>

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Tested-by: Justin P. Mattock <justinmattock@gmail.com>
Tested-by: Roger Quadros <ext-roger.quadros@nokia.com>
Tested-by: Marc Pignat <marc.pignat@hevs.ch>
 		2009-05-04 14:29:02 -07:00
..
9p 9p: fix sparse warnings 2008-10-22 18:54:47 -05:00
bluetooth Bluetooth: Fix issue with sysfs handling for connections 2009-05-04 14:29:02 -07:00
irda irda: Add irda_skb_cb qdisc related padding 2008-12-17 15:44:58 -08:00
iucv [S390] iucv: Locking free version of iucv_message_(receive|send) 2008-12-25 13:39:04 +01:00
netfilter netfilter: nf_nat: add support for persistent mappings 2009-04-16 18:33:01 +02:00
netns netfilter: nf_conntrack: use SLAB_DESTROY_BY_RCU and get rid of call_rcu() 2009-03-25 21:05:46 +01:00
phonet Phonet: use per-namespace devices list 2009-01-26 21:03:35 -08:00
sctp sctp: Clean up TEST_FRAME hacks. 2009-03-21 13:41:09 -07:00
tc_act pkt_action: add new action skbedit 2008-09-12 16:30:20 -07:00
tipc tipc: Remove unneeded parameter to tipc_createport_raw() 2008-07-14 22:42:19 -07:00
act_api.h [NET_SCHED]: act_api: use PTR_ERR in tcf_action_init/tcf_action_get 2008-01-28 15:11:17 -08:00
addrconf.h ipv6: Fix conflict resolutions during ipv6 binding 2009-03-24 19:49:11 -07:00
af_rxrpc.h
…
af_unix.h net: Fix soft lockups/OOM issues w/ unix garbage collector 2008-11-26 15:32:27 -08:00
ah.h
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arp.h [NETFILTER]: ebtables: remove casts, use consts 2008-01-31 19:27:33 -08:00
atmclip.h clip: convert to internal network_device_stats 2009-01-21 14:01:59 -08:00
ax25.h [AX25] ax25_ds_timer: use mod_timer instead of add_timer 2008-02-12 17:53:34 -08:00
ax88796.h ax88796: Add method to take MAC from platform data 2009-03-24 23:32:03 -07:00
cfg80211.h cfg80211: add feature to hold bss 2009-03-27 20:13:13 -04:00
checksum.h include/net net/ - csum_partial - remove unnecessary casts 2008-11-19 15:44:53 -08:00
cipso_ipv4.h netlabel: Label incoming TCP connections correctly in SELinux 2009-03-28 15:01:36 +11:00
compat.h net: Use standard structures for generic socket address structures. 2008-07-19 22:35:47 -07:00
datalink.h
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dcbnl.h net: fix DCB setstate to return success/failure 2008-12-21 20:09:50 -08:00
dn.h decnet: compile fix for removal of byteorder wrapper 2008-11-27 23:04:13 -08:00
dn_dev.h
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dn_fib.h decnet: remove private wrappers of endian helpers 2008-11-27 00:12:47 -08:00
dn_neigh.h
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dn_nsp.h
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dn_route.h
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dsa.h dsa: add switch chip cascading support 2009-03-21 19:06:54 -07:00
dsfield.h
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dst.h netns xfrm: lookup in netns 2008-11-25 17:35:18 -08:00
esp.h [IPSEC]: Use crypto_aead and authenc in ESP 2008-01-31 19:27:02 -08:00
ethoc.h net: Add support for the OpenCores 10/100 Mbps Ethernet MAC. 2009-03-27 00:16:21 -07:00
fib_rules.h net: add fib_rules_ops to flush_cache method 2008-07-05 19:01:28 -07:00
flow.h netns xfrm: lookup in netns 2008-11-25 17:35:18 -08:00
garp.h vlan: Add GVRP support 2008-07-05 21:26:57 -07:00
gen_stats.h pkt_sched: gen_estimator: Optimize gen_estimator_active() 2008-11-26 15:24:32 -08:00
genetlink.h netlink: Improve returned error codes 2008-06-03 16:36:54 -07:00
icmp.h mib: put icmpmsg statistics on struct net 2008-07-18 04:04:22 -07:00
ieee80211_radiotap.h wireless: radiotap updates 2009-03-27 20:12:52 -04:00
if_inet6.h ipv6: reorder struct inet6_ifaddr to remove padding on 64 bit builds 2009-03-21 13:29:05 -07:00
inet6_connection_sock.h
…
inet6_hashtables.h inet: Don't lookup the socket if there's a socket attached to the skb 2008-10-07 12:41:01 -07:00
inet_common.h [NETNS]: Inet control socket should not hold a namespace. 2008-04-03 14:28:30 -07:00
inet_connection_sock.h net: more #ifdef CONFIG_COMPAT 2008-08-28 02:53:51 -07:00
inet_ecn.h net: replace __constant_{endian} uses in net headers 2009-02-14 22:58:35 -08:00
inet_frag.h inet fragments: fix sparse warning: context imbalance 2009-02-26 23:13:35 -08:00
inet_hashtables.h net: move bsockets outside of read only beginning of struct inet_hashinfo 2009-02-01 12:31:33 -08:00
inet_sock.h tcp: Port redirection support for TCP 2008-10-01 07:46:49 -07:00
inet_timewait_sock.h net: Convert TCP & DCCP hash tables to use RCU / hlist_nulls 2008-11-16 19:40:17 -08:00
inetpeer.h net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ip.h ip: support for TX timestamps on UDP and RAW sockets 2009-02-15 22:43:38 -08:00
ip6_checksum.h
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ip6_fib.h [NETNS][IPV6] rt6_info - move rt6_info structure inside the namespace 2008-03-04 13:48:30 -08:00
ip6_route.h netns: Add network namespace argument to rt6_fill_node() and ipv6_dev_get_saddr() 2008-08-14 15:33:21 -07:00
ip6_tunnel.h net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ip_fib.h [IPV4]: Fix compile error building without CONFIG_FS_PROC 2008-02-05 02:54:16 -08:00
ip_vs.h net: replace __constant_{endian} uses in net headers 2009-02-14 22:58:35 -08:00
ipcomp.h ipsec: ipcomp - Merge IPComp implementations 2008-07-25 02:54:40 -07:00
ipconfig.h net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ipip.h inet: Make tunnel RX/TX byte counters more consistent 2008-10-09 12:03:17 -07:00
ipv6.h net: replace __constant_{endian} uses in net headers 2009-02-14 22:58:35 -08:00
ipx.h net: replace __constant_{endian} uses in net headers 2009-02-14 22:58:35 -08:00
iw_handler.h wext: Emit event stream entries correctly when compat. 2008-06-16 18:50:49 -07:00
lapb.h
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lib80211.h wireless: missing include in lib80211.h 2008-11-21 11:42:55 -05:00
llc.h [LLC]: station source mac address 2008-03-28 16:28:36 -07:00
llc_c_ac.h
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llc_c_ev.h
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llc_c_st.h
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llc_conn.h
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llc_if.h [LLC]: Kill static inline llc_addrany 2008-02-29 11:46:17 -08:00
llc_pdu.h [LLC]: skb allocation size for responses 2008-03-31 21:02:47 -07:00
llc_s_ac.h
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llc_s_ev.h
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llc_s_st.h
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llc_sap.h [LLC]: skb allocation size for responses 2008-03-31 21:02:47 -07:00
mac80211.h mac80211/iwlwifi: move virtual A-MDPU queue bookkeeping to iwlwifi 2009-03-27 20:13:23 -04:00
mip6.h [IPV6] MIP6: Use our standard definitions for paddings. 2008-04-12 13:43:22 +09:00
ndisc.h ipv6: Fix sporadic sendmsg -EINVAL when sending to multicast groups. 2009-01-04 16:04:39 -08:00
neighbour.h net: Cleanup of neighbour code 2008-11-12 00:54:54 -08:00
net_namespace.h netns: Remove net_alive 2009-03-03 01:14:27 -08:00
netdma.h net_dma: convert to dma_find_channel 2009-01-06 11:38:15 -07:00
netevent.h
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netlabel.h netlabel: Cleanup the Smack/NetLabel code to fix incoming TCP connections 2009-03-28 15:01:37 +11:00
netlink.h netlink: add nla_policy_len() 2009-03-25 18:26:30 +01:00
netrom.h netrom: convert to internal net_device_stats 2009-01-21 14:02:01 -08:00
nexthop.h
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p8022.h
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pkt_cls.h ematch: simpler tcf_em_unregister() 2008-11-16 23:01:49 -08:00
pkt_sched.h pkt_sched: sch_hfsc: sch_htb: Add non-work-conserving warning handler. 2009-02-01 01:12:42 -08:00
protocol.h ipv6: Add GRO support 2009-01-08 10:40:57 -08:00
psnap.h snap: use const for descriptor 2009-03-21 19:06:50 -07:00
raw.h [RAW]: Add raw_hashinfo member on struct proto. 2008-03-22 16:56:51 -07:00
rawv6.h
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red.h
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request_sock.h net: Fix memory leak in the proto_register function 2008-11-21 16:45:22 -08:00
rose.h rose: improving AX25 routing frames via ROSE network 2008-06-17 17:08:32 -07:00
route.h ipv4: Conditionally enable transparent flow flag when connecting 2008-10-01 07:35:39 -07:00
rtnetlink.h [RTNL]: Introduce the rtnl_kill_links helper. 2008-04-16 00:46:52 -07:00
sch_generic.h net: reorder struct Qdisc for better SMP performance 2009-03-20 01:33:32 -07:00
scm.h Merge branch 'master' into next 2008-11-14 11:29:12 +11:00
slhc_vj.h
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snmp.h net: remove CVS keywords 2008-06-11 21:00:38 -07:00
sock.h Merge branch 'master' of /home/davem/src/GIT/linux-2.6/ 2009-02-24 03:50:29 -08:00
stp.h net: Add STP demux layer 2008-07-05 21:25:39 -07:00
tcp.h tcp: Fix tcp_prequeue() to get correct rto_min value 2009-05-04 11:11:01 -07:00
tcp_states.h
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timewait_sock.h net: Fix memory leak in the proto_register function 2008-11-21 16:45:22 -08:00
transp_v6.h net: replace __constant_{endian} uses in net headers 2009-02-14 22:58:35 -08:00
udp.h ipv6: Fix NULL pointer dereference with time-wait sockets 2009-04-11 01:53:06 -07:00
udplite.h udp: introduce struct udp_table and multiple spinlocks 2008-10-29 01:41:45 -07:00
wext.h wext: Dispatch and handle compat ioctls entirely in net/wireless/wext.c 2008-06-16 18:32:46 -07:00
wimax.h wimax: fix typo in kernel-doc for debugfs_dentry in struct wimax_dev 2009-01-11 00:06:32 -08:00
wireless.h cfg80211: Add AP beacon regulatory hints 2009-02-27 14:52:59 -05:00
x25.h
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x25device.h
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xfrm.h netns xfrm: per-netns sysctls 2008-11-25 18:00:48 -08:00