diff options
| author |   Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de> | 2013-01-11 10:19:51 +0100 |
|---|---|---|
| committer |   Antonio Quartulli <ordex@autistici.org> | 2013-01-19 21:18:12 +0800 |
| commit | 5bc44dc8458cbac08c664f2f337326bf87cc924b (patch) | |
| tree | 05828c0b6a6f00138a539c0ce39e3ea0b109dbce /net/batman-adv/hard-interface.c | |
| parent | batman-adv: rename random32() to prandom_u32() (diff) | |
| download | linux-dev-5bc44dc8458cbac08c664f2f337326bf87cc924b.tar.xz linux-dev-5bc44dc8458cbac08c664f2f337326bf87cc924b.zip | |
batman-adv: postpone sysfs removal when unregistering
When processing the unregister notify for a hard interface, removing
the sysfs files may lead to a circular deadlock (rtnl mutex <->
s_active).
To overcome this problem, postpone the sysfs removal in a worker.
Reported-by: Sasha Levin <sasha.levin@oracle.com>
Reported-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <siwu@hrz.tu-chemnitz.de>
Signed-off-by: Marek Lindner <lindner_marek@yahoo.de>
Signed-off-by: Antonio Quartulli <ordex@autistici.org>
Diffstat (limited to 'net/batman-adv/hard-interface.c')
| -rw-r--r-- | net/batman-adv/hard-interface.c | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/net/batman-adv/hard-interface.c b/net/batman-adv/hard-interface.c index f1d37cd81815..cb3191fe60fc 100644 --- a/net/batman-adv/hard-interface.c +++ b/net/batman-adv/hard-interface.c @@ -457,6 +457,24 @@ out: batadv_hardif_free_ref(primary_if); } +/** + * batadv_hardif_remove_interface_finish - cleans up the remains of a hardif + * @work: work queue item + * + * Free the parts of the hard interface which can not be removed under + * rtnl lock (to prevent deadlock situations). + */ +static void batadv_hardif_remove_interface_finish(struct work_struct *work) +{ + struct batadv_hard_iface *hard_iface; + + hard_iface = container_of(work, struct batadv_hard_iface, + cleanup_work); + + batadv_sysfs_del_hardif(&hard_iface->hardif_obj); + batadv_hardif_free_ref(hard_iface); +} + static struct batadv_hard_iface * batadv_hardif_add_interface(struct net_device *net_dev) { @@ -484,6 +502,9 @@ batadv_hardif_add_interface(struct net_device *net_dev) hard_iface->soft_iface = NULL; hard_iface->if_status = BATADV_IF_NOT_IN_USE; INIT_LIST_HEAD(&hard_iface->list); + INIT_WORK(&hard_iface->cleanup_work, + batadv_hardif_remove_interface_finish); + /* extra reference for return */ atomic_set(&hard_iface->refcount, 2); @@ -518,8 +539,7 @@ static void batadv_hardif_remove_interface(struct batadv_hard_iface *hard_iface) return; hard_iface->if_status = BATADV_IF_TO_BE_REMOVED; - batadv_sysfs_del_hardif(&hard_iface->hardif_obj); - batadv_hardif_free_ref(hard_iface); + queue_work(batadv_event_workqueue, &hard_iface->cleanup_work); } void batadv_hardif_remove_interfaces(void) |