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author | alex.bluesman.smirnov@gmail.com <alex.bluesman.smirnov@gmail.com> | 2012-07-10 21:22:48 +0000 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2012-07-12 07:54:46 -0700 |
commit | 33c34c5e9310622d5ed9a53d571f92824044020f (patch) | |
tree | 46be5ba0abb2f892ee99d82eb2d7268355a99688 /net/ieee802154/6lowpan.c | |
parent | abbee2effcbce55440accb0a1dd315562875efa2 (diff) | |
download | op-kernel-dev-33c34c5e9310622d5ed9a53d571f92824044020f.zip op-kernel-dev-33c34c5e9310622d5ed9a53d571f92824044020f.tar.gz |
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>
Diffstat (limited to 'net/ieee802154/6lowpan.c')
-rw-r--r-- | net/ieee802154/6lowpan.c | 39 |
1 files changed, 20 insertions, 19 deletions
diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c index 2e790fb..6871ec1 100644 --- a/net/ieee802154/6lowpan.c +++ b/net/ieee802154/6lowpan.c @@ -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); |