linux/net/8021q
Debabrata Banerjee c9fbd71f73 netpoll: allow cleanup to be synchronous
This fixes a problem introduced by:
commit 2cde6acd49 ("netpoll: Fix __netpoll_rcu_free so that it can hold the rtnl lock")

When using netconsole on a bond, __netpoll_cleanup can asynchronously
recurse multiple times, each __netpoll_free_async call can result in
more __netpoll_free_async's. This means there is now a race between
cleanup_work queues on multiple netpoll_info's on multiple devices and
the configuration of a new netpoll. For example if a netconsole is set
to enable 0, reconfigured, and enable 1 immediately, this netconsole
will likely not work.

Given the reason for __netpoll_free_async is it can be called when rtnl
is not locked, if it is locked, we should be able to execute
synchronously. It appears to be locked everywhere it's called from.

Generalize the design pattern from the teaming driver for current
callers of __netpoll_free_async.

CC: Neil Horman <nhorman@tuxdriver.com>
CC: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Debabrata Banerjee <dbanerje@akamai.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-10-19 17:01:43 -07:00
..
Kconfig 8021q: update description 2014-01-21 17:01:25 -08:00
Makefile net: remove blank lines at end of file 2018-07-24 14:10:43 -07:00
vlan.c Merge ra.kernel.org:/pub/scm/linux/kernel/git/davem/net 2018-07-03 10:29:26 +09:00
vlan.h vlan: Add extack messages for link create 2018-05-17 17:08:55 -04:00
vlan_core.c vlan: vlan_hw_filter_capable() can be static 2018-03-31 23:20:48 -04:00
vlan_dev.c netpoll: allow cleanup to be synchronous 2018-10-19 17:01:43 -07:00
vlan_gvrp.c net: vlan: prepare for 802.1ad support 2013-04-19 14:45:27 -04:00
vlan_mvrp.c net: vlan: prepare for 802.1ad support 2013-04-19 14:45:27 -04:00
vlan_netlink.c vlan: Add extack messages for link create 2018-05-17 17:08:55 -04:00
vlanproc.c proc: introduce proc_create_net{,_data} 2018-05-16 07:24:30 +02:00
vlanproc.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00