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net: Fix bridgeing sysfs handling of rtnl_lock

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Holding rtnl_lock when we are unregistering the sysfs files can
deadlock if we unconditionally take rtnl_lock in a sysfs file.  So fix
it with the now familiar patter of: rtnl_trylock and syscall_restart()

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 17:00:41 +00:00 committed by David S. Miller
parent 9b8adb5ea0
commit af38f29895
2 changed files with 4 additions and 2 deletions
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3
net/bridge/br_sysfs_br.c
View file

@ -172,7 +172,8 @@ static ssize_t store_stp_state(struct device *d,
if (endp == buf)
return -EINVAL;
rtnl_lock();
if (!rtnl_trylock())
return restart_syscall();
br_stp_set_enabled(br, val);
rtnl_unlock();

3
net/bridge/br_sysfs_if.c
View file

@ -189,7 +189,8 @@ static ssize_t brport_store(struct kobject * kobj,
val = simple_strtoul(buf, &endp, 0);
if (endp != buf) {
rtnl_lock();
if (!rtnl_trylock())
return restart_syscall();
if (p->dev && p->br && brport_attr->store) {
spin_lock_bh(&p->br->lock);
ret = brport_attr->store(p, val);