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| author | Tonghao Zhang <xiangxia.m.yue@gmail.com> | 2020-08-05 15:19:11 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-08-05 12:11:46 -0700 |
| commit | 5845589ed652da9b65833044bd2d0bcb1d676ed0 (patch) | |
| tree | 61d9d9096654cafb960c283ef02a1487d7a2ddc5 /net/openvswitch | |
| parent | a0dced17ad9dc08b1b25e0065b54c97a318e6e8b (diff) | |
| download | lwn-5845589ed652da9b65833044bd2d0bcb1d676ed0.tar.gz lwn-5845589ed652da9b65833044bd2d0bcb1d676ed0.zip | |
net: openvswitch: silence suspicious RCU usage warning
ovs_flow_tbl_destroy always is called from RCU callback
or error path. It is no need to check if rcu_read_lock
or lockdep_ovsl_is_held was held.
ovs_dp_cmd_fill_info always is called with ovs_mutex,
So use the rcu_dereference_ovsl instead of rcu_dereference
in ovs_flow_tbl_masks_cache_size.
Fixes: 9bf24f594c6a ("net: openvswitch: make masks cache size configurable")
Cc: Eelco Chaudron <echaudro@redhat.com>
Reported-by: syzbot+c0eb9e7cdde04e4eb4be@syzkaller.appspotmail.com
Reported-by: syzbot+f612c02823acb02ff9bc@syzkaller.appspotmail.com
Signed-off-by: Tonghao Zhang <xiangxia.m.yue@gmail.com>
Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/openvswitch')
| -rw-r--r-- | net/openvswitch/flow_table.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c index 6527d84c3ea6..8c12675cbb67 100644 --- a/net/openvswitch/flow_table.c +++ b/net/openvswitch/flow_table.c @@ -518,8 +518,8 @@ void ovs_flow_tbl_destroy(struct flow_table *table) { struct table_instance *ti = rcu_dereference_raw(table->ti); struct table_instance *ufid_ti = rcu_dereference_raw(table->ufid_ti); - struct mask_cache *mc = rcu_dereference(table->mask_cache); - struct mask_array *ma = rcu_dereference_ovsl(table->mask_array); + struct mask_cache *mc = rcu_dereference_raw(table->mask_cache); + struct mask_array *ma = rcu_dereference_raw(table->mask_array); call_rcu(&mc->rcu, mask_cache_rcu_cb); call_rcu(&ma->rcu, mask_array_rcu_cb); @@ -937,7 +937,7 @@ int ovs_flow_tbl_num_masks(const struct flow_table *table) u32 ovs_flow_tbl_masks_cache_size(const struct flow_table *table) { - struct mask_cache *mc = rcu_dereference(table->mask_cache); + struct mask_cache *mc = rcu_dereference_ovsl(table->mask_cache); return READ_ONCE(mc->cache_size); } |