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6lowpan: move frame allocation code to a separate function 

Separate frame allocation routine from data processing function.
This makes code more human readable and easier for understanding.

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 2012-04-25 23:35:50 +00:00 committed by David S. Miller
parent 07003408fc
commit c2e94d73ea
1 changed files with 48 additions and 33 deletions
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81
net/ieee802154/6lowpan.c
View File

@ -650,6 +650,53 @@ static void lowpan_fragment_timer_expired(unsigned long entry_addr)
kfree(entry);
}
static struct lowpan_fragment *
lowpan_alloc_new_frame(struct sk_buff *skb, u8 iphc0, u8 len, u8 tag)
{
struct lowpan_fragment *frame;
frame = kzalloc(sizeof(struct lowpan_fragment),
GFP_ATOMIC);
if (!frame)
goto frame_err;
INIT_LIST_HEAD(&frame->list);
frame->length = (iphc0 & 7) | (len << 3);
frame->tag = tag;
/* allocate buffer for frame assembling */
frame->skb = alloc_skb(frame->length +
sizeof(struct ipv6hdr), GFP_ATOMIC);
if (!frame->skb)
goto skb_err;
frame->skb->priority = skb->priority;
frame->skb->dev = skb->dev;
/* reserve headroom for uncompressed ipv6 header */
skb_reserve(frame->skb, sizeof(struct ipv6hdr));
skb_put(frame->skb, frame->length);
init_timer(&frame->timer);
/* time out is the same as for ipv6 - 60 sec */
frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
frame->timer.data = (unsigned long)frame;
frame->timer.function = lowpan_fragment_timer_expired;
add_timer(&frame->timer);
list_add_tail(&frame->list, &lowpan_fragments);
return frame;
skb_err:
kfree(frame);
frame_err:
return NULL;
}
static int
lowpan_process_data(struct sk_buff *skb)
{
@ -692,41 +739,9 @@ lowpan_process_data(struct sk_buff *skb)
/* alloc new frame structure */
if (!found) {
frame = kzalloc(sizeof(struct lowpan_fragment),
GFP_ATOMIC);
frame = lowpan_alloc_new_frame(skb, iphc0, len, tag);
if (!frame)
goto unlock_and_drop;
INIT_LIST_HEAD(&frame->list);
frame->length = (iphc0 & 7) | (len << 3);
frame->tag = tag;
/* allocate buffer for frame assembling */
frame->skb = alloc_skb(frame->length +
sizeof(struct ipv6hdr), GFP_ATOMIC);
if (!frame->skb) {
kfree(frame);
goto unlock_and_drop;
}
frame->skb->priority = skb->priority;
frame->skb->dev = skb->dev;
/* reserve headroom for uncompressed ipv6 header */
skb_reserve(frame->skb, sizeof(struct ipv6hdr));
skb_put(frame->skb, frame->length);
init_timer(&frame->timer);
/* time out is the same as for ipv6 - 60 sec */
frame->timer.expires = jiffies + LOWPAN_FRAG_TIMEOUT;
frame->timer.data = (unsigned long)frame;
frame->timer.function = lowpan_fragment_timer_expired;
add_timer(&frame->timer);
list_add_tail(&frame->list, &lowpan_fragments);
}
if ((iphc0 & LOWPAN_DISPATCH_MASK) == LOWPAN_DISPATCH_FRAG1)