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6lowpan: rework fragment-deleting routine 

6lowpan module starts collecting incomming frames and fragments
right after lowpan_module_init() therefor it will be better to
clean unfinished fragments in lowpan_cleanup_module() function
instead of doing it when link goes down.

Changed spinlocks type to prevent deadlock with expired timer event
and removed unused one.

Signed-off-by: Alexander Smirnov <alex.bluesman.smirnov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
alex.bluesman.smirnov@gmail.com 2012-07-10 21:22:48 +00:00 committed by David S. Miller
parent abbee2effc
commit 33c34c5e93
1 changed files with 20 additions and 19 deletions
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39
net/ieee802154/6lowpan.c
View File

@ -113,7 +113,6 @@ struct lowpan_dev_record {
struct lowpan_fragment {
struct sk_buff *skb; /* skb to be assembled */
spinlock_t lock; /* concurency lock */
u16 length; /* length to be assemled */
u32 bytes_rcv; /* bytes received */
u16 tag; /* current fragment tag */
@ -637,10 +636,7 @@ static void lowpan_fragment_timer_expired(unsigned long entry_addr)
pr_debug("timer expired for frame with tag %d\n", entry->tag);
spin_lock(&flist_lock);
list_del(&entry->list);
spin_unlock(&flist_lock);
dev_kfree_skb(entry->skb);
kfree(entry);
}
@ -727,7 +723,7 @@ lowpan_process_data(struct sk_buff *skb)
* check if frame assembling with the same tag is
* already in progress
*/
spin_lock(&flist_lock);
spin_lock_bh(&flist_lock);
list_for_each_entry(frame, &lowpan_fragments, list)
if (frame->tag == tag) {
@ -761,9 +757,9 @@ lowpan_process_data(struct sk_buff *skb)
if ((frame->bytes_rcv == frame->length) &&
frame->timer.expires > jiffies) {
/* if timer haven't expired - first of all delete it */
del_timer(&frame->timer);
del_timer_sync(&frame->timer);
list_del(&frame->list);
spin_unlock(&flist_lock);
spin_unlock_bh(&flist_lock);
dev_kfree_skb(skb);
skb = frame->skb;
@ -774,7 +770,7 @@ lowpan_process_data(struct sk_buff *skb)
break;
}
spin_unlock(&flist_lock);
spin_unlock_bh(&flist_lock);
return kfree_skb(skb), 0;
}
@ -929,7 +925,7 @@ lowpan_process_data(struct sk_buff *skb)
return lowpan_skb_deliver(skb, &hdr);
unlock_and_drop:
spin_unlock(&flist_lock);
spin_unlock_bh(&flist_lock);
drop:
kfree_skb(skb);
return -EINVAL;
@ -1196,19 +1192,9 @@ static void lowpan_dellink(struct net_device *dev, struct list_head *head)
struct lowpan_dev_info *lowpan_dev = lowpan_dev_info(dev);
struct net_device *real_dev = lowpan_dev->real_dev;
struct lowpan_dev_record *entry, *tmp;
struct lowpan_fragment *frame, *tframe;
ASSERT_RTNL();
spin_lock(&flist_lock);
list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) {
del_timer(&frame->timer);
list_del(&frame->list);
dev_kfree_skb(frame->skb);
kfree(frame);
}
spin_unlock(&flist_lock);
mutex_lock(&lowpan_dev_info(dev)->dev_list_mtx);
list_for_each_entry_safe(entry, tmp, &lowpan_devices, list) {
if (entry->ldev == dev) {
@ -1264,9 +1250,24 @@ out:
static void __exit lowpan_cleanup_module(void)
{
struct lowpan_fragment *frame, *tframe;
lowpan_netlink_fini();
dev_remove_pack(&lowpan_packet_type);
/* Now 6lowpan packet_type is removed, so no new fragments are
* expected on RX, therefore that's the time to clean incomplete
* fragments.
*/
spin_lock_bh(&flist_lock);
list_for_each_entry_safe(frame, tframe, &lowpan_fragments, list) {
del_timer_sync(&frame->timer);
list_del(&frame->list);
dev_kfree_skb(frame->skb);
kfree(frame);
}
spin_unlock_bh(&flist_lock);
}
module_init(lowpan_init_module);