diff options
| author | Ralf Baechle DL5RB <ralf@linux-mips.org> | 2006-07-04 06:30:18 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2006-07-04 06:30:18 +0400 |
| commit | 006f68b84fe19fc5015a8cf838a10d75f91f0218 (patch) | |
| tree | 2c9377778e4e09bb8d10084341207ba1352f600a /net/ax25/ax25_route.c | |
| parent | 8dc22d2b642f8a6f14ef8878777a05311e5d1d7e (diff) | |
| download | linux-006f68b84fe19fc5015a8cf838a10d75f91f0218.tar.xz | |
[AX.25]: Reference counting for AX.25 routes.
In the past routes could be freed even though the were possibly in use ...
Signed-off-by: Ralf Baechle DL5RB <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ax25/ax25_route.c')
| -rw-r--r-- | net/ax25/ax25_route.c | 49 |
1 files changed, 8 insertions, 41 deletions
diff --git a/net/ax25/ax25_route.c b/net/ax25/ax25_route.c index 5ac98250797b..51b7bdaf27eb 100644 --- a/net/ax25/ax25_route.c +++ b/net/ax25/ax25_route.c @@ -41,8 +41,6 @@ static ax25_route *ax25_route_list; static DEFINE_RWLOCK(ax25_route_lock); -static ax25_route *ax25_get_route(ax25_address *, struct net_device *); - void ax25_rt_device_down(struct net_device *dev) { ax25_route *s, *t, *ax25_rt; @@ -115,7 +113,7 @@ static int ax25_rt_add(struct ax25_routes_struct *route) return -ENOMEM; } - atomic_set(&ax25_rt->ref, 0); + atomic_set(&ax25_rt->refcount, 1); ax25_rt->callsign = route->dest_addr; ax25_rt->dev = ax25_dev->dev; ax25_rt->digipeat = NULL; @@ -140,23 +138,10 @@ static int ax25_rt_add(struct ax25_routes_struct *route) return 0; } -static void ax25_rt_destroy(ax25_route *ax25_rt) +void __ax25_put_route(ax25_route *ax25_rt) { - if (atomic_read(&ax25_rt->ref) == 0) { - kfree(ax25_rt->digipeat); - kfree(ax25_rt); - return; - } - - /* - * Uh... Route is still in use; we can't yet destroy it. Retry later. - */ - init_timer(&ax25_rt->timer); - ax25_rt->timer.data = (unsigned long) ax25_rt; - ax25_rt->timer.function = (void *) ax25_rt_destroy; - ax25_rt->timer.expires = jiffies + 5 * HZ; - - add_timer(&ax25_rt->timer); + kfree(ax25_rt->digipeat); + kfree(ax25_rt); } static int ax25_rt_del(struct ax25_routes_struct *route) @@ -177,12 +162,12 @@ static int ax25_rt_del(struct ax25_routes_struct *route) ax25cmp(&route->dest_addr, &s->callsign) == 0) { if (ax25_route_list == s) { ax25_route_list = s->next; - ax25_rt_destroy(s); + ax25_put_route(s); } else { for (t = ax25_route_list; t != NULL; t = t->next) { if (t->next == s) { t->next = s->next; - ax25_rt_destroy(s); + ax25_put_route(s); break; } } @@ -362,7 +347,7 @@ struct file_operations ax25_route_fops = { * * Only routes with a reference count of zero can be destroyed. */ -static ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev) +ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev) { ax25_route *ax25_spe_rt = NULL; ax25_route *ax25_def_rt = NULL; @@ -392,7 +377,7 @@ static ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev) ax25_rt = ax25_spe_rt; if (ax25_rt != NULL) - atomic_inc(&ax25_rt->ref); + ax25_hold_route(ax25_rt); read_unlock(&ax25_route_lock); @@ -467,24 +452,6 @@ put: return 0; } -ax25_route *ax25_rt_find_route(ax25_route * route, ax25_address *addr, - struct net_device *dev) -{ - ax25_route *ax25_rt; - - if ((ax25_rt = ax25_get_route(addr, dev))) - return ax25_rt; - - route->next = NULL; - atomic_set(&route->ref, 1); - route->callsign = *addr; - route->dev = dev; - route->digipeat = NULL; - route->ip_mode = ' '; - - return route; -} - struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src, ax25_address *dest, ax25_digi *digi) { |