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Subject[Patch] (revised) net/xfrm/xfrm_policy.c: replace timer with delayed_work
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As suggested by Herbert Xu, using workqueue is better than timer
for net/xfrm/xfrm_policy.c, so replace them with delayed_work.
And due to this change, we have to disable BH when trying to
lock.

Note that, this patch is not fully tested, so should be
in -mm first.

Signed-off-by: WANG Cong <wangcong@zeuux.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David Miller <davem@davemloft.net>

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index d1350bc..ba1bb24 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -457,7 +457,7 @@ struct xfrm_policy
/* This lock only affects elements except for entry. */
rwlock_t lock;
atomic_t refcnt;
- struct timer_list timer;
+ struct delayed_work work;

u32 priority;
u32 index;
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index cae9fd8..2ed14e0 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -154,15 +154,16 @@ static inline unsigned long make_jiffies(long secs)
return secs*HZ;
}

-static void xfrm_policy_timer(unsigned long data)
+static void xfrm_policy_worker(struct work_struct *w)
{
- struct xfrm_policy *xp = (struct xfrm_policy*)data;
+ struct xfrm_policy *xp =
+ container_of((struct delayed_work *)w, struct xfrm_policy, work);
unsigned long now = get_seconds();
long next = LONG_MAX;
int warn = 0;
int dir;

- read_lock(&xp->lock);
+ read_lock_bh(&xp->lock);

if (xp->dead)
goto out;
@@ -209,16 +210,16 @@ static void xfrm_policy_timer(unsigned long data)
if (warn)
km_policy_expired(xp, dir, 0, 0);
if (next != LONG_MAX &&
- !mod_timer(&xp->timer, jiffies + make_jiffies(next)))
+ !schedule_delayed_work(&xp->work, make_jiffies(next)))
xfrm_pol_hold(xp);

out:
- read_unlock(&xp->lock);
+ read_unlock_bh(&xp->lock);
xfrm_pol_put(xp);
return;

expired:
- read_unlock(&xp->lock);
+ read_unlock_bh(&xp->lock);
if (!xfrm_policy_delete(xp, dir))
km_policy_expired(xp, dir, 1, 0);
xfrm_pol_put(xp);
@@ -236,13 +237,12 @@ struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp)
policy = kzalloc(sizeof(struct xfrm_policy), gfp);

if (policy) {
+ INIT_DELAYED_WORK(&policy->work, xfrm_policy_worker);
INIT_LIST_HEAD(&policy->bytype);
INIT_HLIST_NODE(&policy->bydst);
INIT_HLIST_NODE(&policy->byidx);
rwlock_init(&policy->lock);
atomic_set(&policy->refcnt, 1);
- setup_timer(&policy->timer, xfrm_policy_timer,
- (unsigned long)policy);
}
return policy;
}
@@ -256,7 +256,7 @@ void xfrm_policy_destroy(struct xfrm_policy *policy)

BUG_ON(policy->bundles);

- if (del_timer(&policy->timer))
+ if (cancel_delayed_work(&policy->work))
BUG();

write_lock_bh(&xfrm_policy_lock);
@@ -277,7 +277,7 @@ static void xfrm_policy_gc_kill(struct xfrm_policy *policy)
dst_free(dst);
}

- if (del_timer(&policy->timer))
+ if (cancel_delayed_work(&policy->work))
atomic_dec(&policy->refcnt);

if (atomic_read(&policy->refcnt) > 1)
@@ -615,7 +615,7 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
hlist_add_head(&policy->byidx, xfrm_policy_byidx+idx_hash(policy->index));
policy->curlft.add_time = get_seconds();
policy->curlft.use_time = 0;
- if (!mod_timer(&policy->timer, jiffies + HZ))
+ if (!schedule_delayed_work(&policy->work, HZ))
xfrm_pol_hold(policy);
list_add_tail(&policy->bytype, &xfrm_policy_bytype[policy->type]);
write_unlock_bh(&xfrm_policy_lock);

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