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| author | Debabrata Banerjee <dbanerje@akamai.com> | 2018-10-18 17:18:26 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-10-20 02:01:43 +0200 |
| commit | c9fbd71f73094311b31ee703a918e9e0df502cef (patch) | |
| tree | 1f3d85463e83f066e5aa7e335d70382f0fc23dba /net/dsa/slave.c | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (diff) | |
| download | linux-c9fbd71f73094311b31ee703a918e9e0df502cef.tar.xz linux-c9fbd71f73094311b31ee703a918e9e0df502cef.zip | |
netpoll: allow cleanup to be synchronous
This fixes a problem introduced by:
commit 2cde6acd49da ("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>
Diffstat (limited to 'net/dsa/slave.c')
| -rw-r--r-- | net/dsa/slave.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/dsa/slave.c b/net/dsa/slave.c index 5428ef529019..7d0c19e7edcf 100644 --- a/net/dsa/slave.c +++ b/net/dsa/slave.c @@ -722,7 +722,7 @@ static void dsa_slave_netpoll_cleanup(struct net_device *dev) p->netpoll = NULL; - __netpoll_free_async(netpoll); + __netpoll_free(netpoll); } static void dsa_slave_poll_controller(struct net_device *dev) |