diff options
| author | nikolay@redhat.com <nikolay@redhat.com> | 2013-04-22 10:12:22 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-04-25 10:03:21 +0200 |
| commit | c6cdcf6d82bc8f53e64ad59464e0114fe48e28bb (patch) | |
| tree | 3a15cd4d3dcbb1d057d7e60fe1efb1346c0ef942 /drivers/net/bonding/bond_main.c | |
| parent | bnx2x: Prevent NULL pointer dereference in kdump (diff) | |
| download | linux-c6cdcf6d82bc8f53e64ad59464e0114fe48e28bb.tar.xz linux-c6cdcf6d82bc8f53e64ad59464e0114fe48e28bb.zip | |
bonding: fix locking in enslave failure path
In commit 3c5913b53fefc9d9e15a2d0f93042766658d9f3f ("bonding:
primary_slave & curr_active_slave are not cleaned on enslave failure")
I didn't account for the use of curr_active_slave without curr_slave_lock
and since there are such users, we should hold bond->lock for writing while
setting it to NULL (in the NULL case we don't need the curr_slave_lock).
Keeping the bond lock as to avoid the extra release/acquire cycle.
Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index dbbea0eec134..7db40de1b41f 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -1915,14 +1915,16 @@ err_detach: bond_detach_slave(bond, new_slave); if (bond->primary_slave == new_slave) bond->primary_slave = NULL; - write_unlock_bh(&bond->lock); if (bond->curr_active_slave == new_slave) { + bond_change_active_slave(bond, NULL); + write_unlock_bh(&bond->lock); read_lock(&bond->lock); write_lock_bh(&bond->curr_slave_lock); - bond_change_active_slave(bond, NULL); bond_select_active_slave(bond); write_unlock_bh(&bond->curr_slave_lock); read_unlock(&bond->lock); + } else { + write_unlock_bh(&bond->lock); } slave_disable_netpoll(new_slave); |