@@ -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);
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> --- drivers/net/bonding/bond_sysfs.c | 9 ++++++--- 1 files changed, 6 insertions(+), 3 deletions(-)