diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2009-05-13 21:02:50 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-05-19 09:16:00 +0400 |
| commit | 496a60cdcd5d0d884dddf6c3b4ea912923a70f13 (patch) | |
| tree | dd7c3e4e61d4c4bead3c7bd3db17401431e6d87e | |
| parent | 26574401fef6766f6c3ca25b5c13febe662d2a32 (diff) | |
| download | linux-496a60cdcd5d0d884dddf6c3b4ea912923a70f13.tar.xz | |
net: FIX bonding sysfs rtnl_lock deadlock
Sysfs files for a network device can not unconditionally take the
rtnl_lock as the bonding sysfs files do. If someone accesses those
sysfs files while the network device is being unregistered with the
rtnl_lock held we will deadlock.
So use trylock and restart_syscall to avoid this problem.
Signed-off-by: Eric W. Biederman <ebiederm@aristanetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/bonding/bond_sysfs.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c index d28731535226..3a1b7b04eb79 100644 --- a/drivers/net/bonding/bond_sysfs.c +++ b/drivers/net/bonding/bond_sysfs.c @@ -251,7 +251,8 @@ static ssize_t bonding_store_slaves(struct device *d, /* Note: We can't hold bond->lock here, as bond_create grabs it. */ - rtnl_lock(); + if (!rtnl_trylock()) + return restart_syscall(); down_write(&(bonding_rwsem)); sscanf(buffer, "%16s", command); /* IFNAMSIZ*/ @@ -1171,7 +1172,8 @@ static ssize_t bonding_store_primary(struct device *d, struct slave *slave; struct bonding *bond = to_bond(d); - rtnl_lock(); + if (!rtnl_trylock()) + return restart_syscall(); read_lock(&bond->lock); write_lock_bh(&bond->curr_slave_lock); @@ -1288,7 +1290,8 @@ static ssize_t bonding_store_active_slave(struct device *d, struct slave *new_active = NULL; struct bonding *bond = to_bond(d); - rtnl_lock(); + if (!rtnl_trylock()) + return restart_syscall(); read_lock(&bond->lock); write_lock_bh(&bond->curr_slave_lock); |