Hi Eric,

hmm, I think you are right.

First 6LoWPAN implementation was developed as a part of MAC layer and
code was based on this layer approach. But now 6lowpan is
MAC-independent, it's just a netif_rx hook and looks like I missed
this moment during migration.

sorry for confusion.

With best regards,
Alexander

2011/9/1 Eric Dumazet <eric.duma...@gmail.com>:
> Le jeudi 01 septembre 2011 à 16:54 +0400, Alexander Smirnov a écrit :
>> This patch fixes 2 issues in lowpan_skb_deliver function:
>> 1. Check for return status of skb_copy call;
>> 2. Use skb_copy with proper GFP flag depending on context.
>>
>> Signed-off-by: Alexander Smirnov <alex.bluesman.smir...@gmail.com>
>> ---
>>  net/ieee802154/6lowpan.c |   18 +++++++++++++++---
>>  1 files changed, 15 insertions(+), 3 deletions(-)
>>
>> diff --git a/net/ieee802154/6lowpan.c b/net/ieee802154/6lowpan.c
>> index cf304cc..16100be 100644
>> --- a/net/ieee802154/6lowpan.c
>> +++ b/net/ieee802154/6lowpan.c
>> @@ -477,9 +477,15 @@ static int lowpan_skb_deliver(struct sk_buff *skb, 
>> struct ipv6hdr *hdr)
>>       struct sk_buff *new;
>>       struct lowpan_dev_record *entry;
>>       int stat = NET_RX_SUCCESS;
>> +     gfp_t mask;
>>
>> -     new = skb_copy_expand(skb, sizeof(struct ipv6hdr), skb_tailroom(skb),
>> -                                                             GFP_KERNEL);
>> +     if (in_interrupt())
>> +             mask = GFP_ATOMIC;
>> +     else
>> +             mask = GFP_KERNEL;
>
> I am not sure to understand if lowpan_skb_deliver() can be called in
> pure process context. I feel we are in softirq handler or we have
> disabled BH, so GFP_ATOMIC is the only choice.
>
> If you are unsure, you could use following helper :
>
>        mask = gfp_any();
>
>> +
>> +     new = skb_copy_expand(skb, sizeof(struct ipv6hdr),
>> +                                     skb_tailroom(skb), mask);
>>       kfree_skb(skb);
>>
>
>

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