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netns xfrm: per-netns km_waitq 

Disallow spurious wakeups in __xfrm_lookup().

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Dobriyan 2008-11-25 17:21:01 -08:00 committed by David S. Miller
parent c78371441c
commit 50a30657fd
5 changed files with 13 additions and 13 deletions
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3
include/net/netns/xfrm.h
View File

@ -2,6 +2,7 @@
#define __NETNS_XFRM_H
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/workqueue.h>
struct netns_xfrm {
@ -22,6 +23,8 @@ struct netns_xfrm {
struct work_struct state_hash_work;
struct hlist_head state_gc_list;
struct work_struct state_gc_work;
wait_queue_head_t km_waitq;
};
#endif

1
include/net/xfrm.h
View File

@ -1459,7 +1459,6 @@ extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
struct xfrm_kmaddress *k);
#endif
extern wait_queue_head_t km_waitq;
extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);

2
net/key/af_key.c
View File

@ -1411,7 +1411,7 @@ static int pfkey_acquire(struct sock *sk, struct sk_buff *skb, struct sadb_msg *
spin_lock_bh(&x->lock);
if (x->km.state == XFRM_STATE_ACQ) {
x->km.state = XFRM_STATE_ERROR;
wake_up(&km_waitq);
wake_up(&init_net.xfrm.km_waitq);
}
spin_unlock_bh(&x->lock);
xfrm_state_put(x);

4
net/xfrm/xfrm_policy.c
View File

@ -1691,11 +1691,11 @@ restart:
if (err == -EAGAIN && (flags & XFRM_LOOKUP_WAIT)) {
DECLARE_WAITQUEUE(wait, current);
add_wait_queue(&km_waitq, &wait);
add_wait_queue(&init_net.xfrm.km_waitq, &wait);
set_current_state(TASK_INTERRUPTIBLE);
schedule();
set_current_state(TASK_RUNNING);
remove_wait_queue(&km_waitq, &wait);
remove_wait_queue(&init_net.xfrm.km_waitq, &wait);
nx = xfrm_tmpl_resolve(pols, npols, fl, xfrm, family);

16
net/xfrm/xfrm_state.c
View File

@ -170,9 +170,6 @@ out_unlock:
mutex_unlock(&hash_resize_mutex);
}
DECLARE_WAIT_QUEUE_HEAD(km_waitq);
EXPORT_SYMBOL(km_waitq);
static DEFINE_RWLOCK(xfrm_state_afinfo_lock);
static struct xfrm_state_afinfo *xfrm_state_afinfo[NPROTO];
@ -399,7 +396,7 @@ static void xfrm_state_gc_task(struct work_struct *work)
hlist_for_each_entry_safe(x, entry, tmp, &gc_list, gclist)
xfrm_state_gc_destroy(x);
wake_up(&km_waitq);
wake_up(&net->xfrm.km_waitq);
}
static inline unsigned long make_jiffies(long secs)
@ -470,7 +467,7 @@ resched:
expired:
if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0) {
x->km.state = XFRM_STATE_EXPIRED;
wake_up(&km_waitq);
wake_up(&init_net.xfrm.km_waitq);
next = 2;
goto resched;
}
@ -638,7 +635,7 @@ restart:
out:
spin_unlock_bh(&xfrm_state_lock);
wake_up(&km_waitq);
wake_up(&init_net.xfrm.km_waitq);
return err;
}
EXPORT_SYMBOL(xfrm_state_flush);
@ -929,7 +926,7 @@ static void __xfrm_state_insert(struct xfrm_state *x)
if (x->replay_maxage)
mod_timer(&x->rtimer, jiffies + x->replay_maxage);
wake_up(&km_waitq);
wake_up(&init_net.xfrm.km_waitq);
init_net.xfrm.state_num++;
@ -1743,7 +1740,7 @@ void km_state_expired(struct xfrm_state *x, int hard, u32 pid)
km_state_notify(x, &c);
if (hard)
wake_up(&km_waitq);
wake_up(&init_net.xfrm.km_waitq);
}
EXPORT_SYMBOL(km_state_expired);
@ -1794,7 +1791,7 @@ void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid)
km_policy_notify(pol, dir, &c);
if (hard)
wake_up(&km_waitq);
wake_up(&init_net.xfrm.km_waitq);
}
EXPORT_SYMBOL(km_policy_expired);
@ -2089,6 +2086,7 @@ int __net_init xfrm_state_init(struct net *net)
INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
INIT_HLIST_HEAD(&net->xfrm.state_gc_list);
INIT_WORK(&net->xfrm.state_gc_work, xfrm_state_gc_task);
init_waitqueue_head(&net->xfrm.km_waitq);
return 0;
out_byspi: