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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>
This commit is contained in:
Eric W. Biederman 2009-05-13 17:02:50 +00:00 committed by David S. Miller
parent 26574401fe
commit 496a60cdcd
1 changed files with 6 additions and 3 deletions
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9
drivers/net/bonding/bond_sysfs.c
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@ -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);