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I got a warining report:
br_sysfs_addbr: can't create group bridge4/bridge
------------[ cut here ]------------
sysfs group 'bridge' not found for kobject 'bridge4'
WARNING: CPU: 2 PID: 9004 at fs/sysfs/group.c:279 sysfs_remove_group fs/sysfs/group.c:279 [inline]
WARNING: CPU: 2 PID: 9004 at fs/sysfs/group.c:279 sysfs_remove_group+0x153/0x1b0 fs/sysfs/group.c:270
Modules linked in: iptable_nat
...
Call Trace:
br_dev_delete+0x112/0x190 net/bridge/br_if.c:384
br_dev_newlink net/bridge/br_netlink.c:1381 [inline]
br_dev_newlink+0xdb/0x100 net/bridge/br_netlink.c:1362
__rtnl_newlink+0xe11/0x13f0 net/core/rtnetlink.c:3441
rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3500
rtnetlink_rcv_msg+0x385/0x980 net/core/rtnetlink.c:5562
netlink_rcv_skb+0x134/0x3d0 net/netlink/af_netlink.c:2494
netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline]
netlink_unicast+0x4a0/0x6a0 net/netlink/af_netlink.c:1330
netlink_sendmsg+0x793/0xc80 net/netlink/af_netlink.c:1919
sock_sendmsg_nosec net/socket.c:651 [inline]
sock_sendmsg+0x139/0x170 net/socket.c:671
____sys_sendmsg+0x658/0x7d0 net/socket.c:2353
___sys_sendmsg+0xf8/0x170 net/socket.c:2407
__sys_sendmsg+0xd3/0x190 net/socket.c:2440
do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xa9
In br_device_event(), if the bridge sysfs fails to be added,
br_device_event() should return error. This can prevent warining
when removing bridge sysfs that do not exist.
Fixes: bb900b27a2 ("bridge: allow creating bridge devices with netlink")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wang Hai <wanghai38@huawei.com>
Tested-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Acked-by: Nikolay Aleksandrov <nikolay@nvidia.com>
Link: https://lore.kernel.org/r/20201211122921.40386-1-wanghai38@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
989a1db06e