[ATM]: Clip timer race.
By inspection, the clip idle timer code is racy on SMP.
Here is a safe version of timer management.
Untested, I don't have ATM hardware.
Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/atm/clip.c b/net/atm/clip.c
index 5841c30..b1f12f6 100644
--- a/net/atm/clip.c
+++ b/net/atm/clip.c
@@ -54,8 +54,6 @@
static struct atm_vcc *atmarpd;
static struct neigh_table clip_tbl;
static struct timer_list idle_timer;
-static int start_timer = 1;
-
static int to_atmarpd(enum atmarp_ctrl_type type,int itf,unsigned long ip)
{
@@ -725,13 +723,8 @@
return -EADDRINUSE;
}
- if (start_timer) {
- start_timer = 0;
- init_timer(&idle_timer);
- idle_timer.expires = jiffies+CLIP_CHECK_INTERVAL*HZ;
- idle_timer.function = idle_timer_check;
- add_timer(&idle_timer);
- }
+ mod_timer(&idle_timer, jiffies+CLIP_CHECK_INTERVAL*HZ);
+
atmarpd = vcc;
set_bit(ATM_VF_META,&vcc->flags);
set_bit(ATM_VF_READY,&vcc->flags);
@@ -1002,6 +995,8 @@
register_netdevice_notifier(&clip_dev_notifier);
register_inetaddr_notifier(&clip_inet_notifier);
+ setup_timer(&idle_timer, idle_timer_check, 0);
+
#ifdef CONFIG_PROC_FS
{
struct proc_dir_entry *p;
@@ -1029,8 +1024,7 @@
/* First, stop the idle timer, so it stops banging
* on the table.
*/
- if (start_timer == 0)
- del_timer(&idle_timer);
+ del_timer_sync(&idle_timer);
/* Next, purge the table, so that the device
* unregister loop below does not hang due to