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Ingo Molnar 0bf52b9817 net: Fix spinlock use in alloc_netdev_mq() ... -tip testing found this lockdep warning: [ 2.272010] calling net_dev_init+0x0/0x164 @ 1 [ 2.276033] device class 'net': registering [ 2.280191] INFO: trying to register non-static key. [ 2.284005] the code is fine but needs lockdep annotation. [ 2.284005] turning off the locking correctness validator. [ 2.284005] Pid: 1, comm: swapper Not tainted 2.6.31-rc5-tip #1145 [ 2.284005] Call Trace: [ 2.284005] [<7958eb4e>] ? printk+0xf/0x11 [ 2.284005] [<7904f83c>] __lock_acquire+0x11b/0x622 [ 2.284005] [<7908c9b7>] ? alloc_debug_processing+0xf9/0x144 [ 2.284005] [<7904e2be>] ? mark_held_locks+0x3a/0x52 [ 2.284005] [<7908dbc4>] ? kmem_cache_alloc+0xa8/0x13f [ 2.284005] [<7904e475>] ? trace_hardirqs_on_caller+0xa2/0xc3 [ 2.284005] [<7904fdf6>] lock_acquire+0xb3/0xd0 [ 2.284005] [<79489678>] ? alloc_netdev_mq+0xf5/0x1ad [ 2.284005] [<79591514>] _spin_lock_bh+0x2d/0x5d [ 2.284005] [<79489678>] ? alloc_netdev_mq+0xf5/0x1ad [ 2.284005] [<79489678>] alloc_netdev_mq+0xf5/0x1ad [ 2.284005] [<793a38f2>] ? loopback_setup+0x0/0x74 [ 2.284005] [<798eecd0>] loopback_net_init+0x20/0x5d [ 2.284005] [<79483efb>] register_pernet_device+0x23/0x4b [ 2.284005] [<798f5c9f>] net_dev_init+0x115/0x164 [ 2.284005] [<7900104f>] do_one_initcall+0x4a/0x11a [ 2.284005] [<798f5b8a>] ? net_dev_init+0x0/0x164 [ 2.284005] [<79066f6d>] ? register_irq_proc+0x8c/0xa8 [ 2.284005] [<798cc29a>] do_basic_setup+0x42/0x52 [ 2.284005] [<798cc30a>] kernel_init+0x60/0xa1 [ 2.284005] [<798cc2aa>] ? kernel_init+0x0/0xa1 [ 2.284005] [<79003e03>] kernel_thread_helper+0x7/0x10 [ 2.284078] device: 'lo': device_add [ 2.288248] initcall net_dev_init+0x0/0x164 returned 0 after 11718 usecs [ 2.292010] calling neigh_init+0x0/0x66 @ 1 [ 2.296010] initcall neigh_init+0x0/0x66 returned 0 after 0 usecs it's using an zero-initialized spinlock. This is a side-effect of: dev_unicast_init(dev); in alloc_netdev_mq() making use of dev->addr_list_lock. The device has just been allocated freshly, it's not accessible anywhere yet so no locking is needed at all - in fact it's wrong to lock it here (the lock isnt initialized yet). This bug was introduced via: | commit a6ac65db23 | Date: Thu Jul 30 01:06:12 2009 +0000 | | net: restore the original spinlock to protect unicast list Signed-off-by: Ingo Molnar <mingo@elte.hu> Acked-by: Jiri Pirko <jpirko@redhat.com> Tested-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: David S. Miller <davem@davemloft.net>		16 years ago
..
Makefile	Network Drop Monitor: Adding Build changes to enable drop monitor	16 years ago
datagram.c	net: adding memory barrier to the poll and receive callbacks	16 years ago
dev.c	net: Fix spinlock use in alloc_netdev_mq()	16 years ago
dev_mcast.c	…
drop_monitor.c	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6	16 years ago
dst.c	…
ethtool.c	core: remove pointless conditional before kfree()	16 years ago
fib_rules.c	net: Remove unused parameter from fill method in fib_rules_ops.	16 years ago
filter.c	…
flow.c	…
gen_estimator.c	pkt_sched: gen_estimator: Fix signed integers right-shifts.	16 years ago
gen_stats.c	…
iovec.c	net: Fix memcpy_toiovecend() to use the right offset	16 years ago
kmap_skb.h	…
link_watch.c	…
neighbour.c	neigh: fix state transition INCOMPLETE->FAILED via Netlink request	16 years ago
net-sysfs.c	net: Remove bogus reference to BUS_ID_SIZE in sysfs code.	16 years ago
net-sysfs.h	…
net-traces.c	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6	16 years ago
net_namespace.c	net: net_assign_generic() fix	16 years ago
netevent.c	…
netpoll.c	netpoll: Fix carrier detection for drivers that are using phylib	16 years ago
pktgen.c	net pkgen.c:fix no need for check	16 years ago
request_sock.c	…
rtnetlink.c	netlink: change nlmsg_notify() return value logic	16 years ago
scm.c	…
skb_dma_map.c	net: skb_shared_info optimization	16 years ago
skbuff.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6	16 years ago
sock.c	Fix error return for setsockopt(SO_TIMESTAMPING)	16 years ago
stream.c	tcp: tcp_prequeue() can use keyed wakeups	16 years ago
sysctl_net_core.c	sysctl: fix sparse warning: Should it be static?	16 years ago
user_dma.c	net/core/user_dma.c: Use frag list abstraction interfaces.	16 years ago
utils.c	net: core: remove unneeded include in net/core/utils.c.	16 years ago