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net: dev_add_pack() & __dev_remove_pack() changes 

Add a small helper ptype_head() to get the head to manipulate

dev_add_pack() & __dev_remove_pack() can use a spinlock without
blocking BH, since softirq use RCU, and these functions are run from
process context only.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-09-02 03:53:46 +00:00 committed by David S. Miller
parent c688399634
commit c07b68e841
1 changed files with 15 additions and 17 deletions
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32
net/core/dev.c
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@ -371,6 +371,14 @@ static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
* --ANK (980803)
*/
static inline struct list_head *ptype_head(const struct packet_type *pt)
{
if (pt->type == htons(ETH_P_ALL))
return &ptype_all;
else
return &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
}
/**
* dev_add_pack - add packet handler
* @pt: packet type declaration
@ -386,16 +394,11 @@ static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
void dev_add_pack(struct packet_type *pt)
{
int hash;
struct list_head *head = ptype_head(pt);
spin_lock_bh(&ptype_lock);
if (pt->type == htons(ETH_P_ALL))
list_add_rcu(&pt->list, &ptype_all);
else {
hash = ntohs(pt->type) & PTYPE_HASH_MASK;
list_add_rcu(&pt->list, &ptype_base[hash]);
}
spin_unlock_bh(&ptype_lock);
spin_lock(&ptype_lock);
list_add_rcu(&pt->list, head);
spin_unlock(&ptype_lock);
}
EXPORT_SYMBOL(dev_add_pack);
@ -414,15 +417,10 @@ EXPORT_SYMBOL(dev_add_pack);
*/
void __dev_remove_pack(struct packet_type *pt)
{
struct list_head *head;
struct list_head *head = ptype_head(pt);
struct packet_type *pt1;
spin_lock_bh(&ptype_lock);
if (pt->type == htons(ETH_P_ALL))
head = &ptype_all;
else
head = &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
spin_lock(&ptype_lock);
list_for_each_entry(pt1, head, list) {
if (pt == pt1) {
@ -433,7 +431,7 @@ void __dev_remove_pack(struct packet_type *pt)
printk(KERN_WARNING "dev_remove_pack: %p not found.\n", pt);
out:
spin_unlock_bh(&ptype_lock);
spin_unlock(&ptype_lock);
}
EXPORT_SYMBOL(__dev_remove_pack);