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| author | John Fastabend <john.r.fastabend@intel.com> | 2010-11-16 06:31:39 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-11-17 12:27:46 -0800 |
| commit | 9ea19481db31d614f729f346bdcf28e4e60ff14a (patch) | |
| tree | d92a2c8984a7538cdd05694b02fd5028ffaed0b0 /net/core/net-sysfs.c | |
| parent | 5811662b15db018c740c57d037523683fd3e6123 (diff) | |
| download | kernel-common-9ea19481db31d614f729f346bdcf28e4e60ff14a.tar.gz kernel-common-9ea19481db31d614f729f346bdcf28e4e60ff14a.tar.bz2 kernel-common-9ea19481db31d614f729f346bdcf28e4e60ff14a.zip | |
net: zero kobject in rx_queue_release
netif_set_real_num_rx_queues() can decrement and increment
the number of rx queues. For example ixgbe does this as
features and offloads are toggled. Presumably this could
also happen across down/up on most devices if the available
resources changed (cpu offlined).
The kobject needs to be zero'd in this case so that the
state is not preserved across kobject_put()/kobject_init_and_add().
This resolves the following error report.
ixgbe 0000:03:00.0: eth2: NIC Link is Up 10 Gbps, Flow Control: RX/TX
kobject (ffff880324b83210): tried to init an initialized object, something is seriously wrong.
Pid: 1972, comm: lldpad Not tainted 2.6.37-rc18021qaz+ #169
Call Trace:
[<ffffffff8121c940>] kobject_init+0x3a/0x83
[<ffffffff8121cf77>] kobject_init_and_add+0x23/0x57
[<ffffffff8107b800>] ? mark_lock+0x21/0x267
[<ffffffff813c6d11>] net_rx_queue_update_kobjects+0x63/0xc6
[<ffffffff813b5e0e>] netif_set_real_num_rx_queues+0x5f/0x78
[<ffffffffa0261d49>] ixgbe_set_num_queues+0x1c6/0x1ca [ixgbe]
[<ffffffffa0262509>] ixgbe_init_interrupt_scheme+0x1e/0x79c [ixgbe]
[<ffffffffa0274596>] ixgbe_dcbnl_set_state+0x167/0x189 [ixgbe]
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/net-sysfs.c')
| -rw-r--r-- | net/core/net-sysfs.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/net/core/net-sysfs.c b/net/core/net-sysfs.c index 3ba526b56fe3..7abeb7ceaa4c 100644 --- a/net/core/net-sysfs.c +++ b/net/core/net-sysfs.c @@ -711,13 +711,18 @@ static void rx_queue_release(struct kobject *kobj) map = rcu_dereference_raw(queue->rps_map); - if (map) + if (map) { + RCU_INIT_POINTER(queue->rps_map, NULL); call_rcu(&map->rcu, rps_map_release); + } flow_table = rcu_dereference_raw(queue->rps_flow_table); - if (flow_table) + if (flow_table) { + RCU_INIT_POINTER(queue->rps_flow_table, NULL); call_rcu(&flow_table->rcu, rps_dev_flow_table_release); + } + memset(kobj, 0, sizeof(*kobj)); dev_put(queue->dev); } |