On Wed, 2014-09-10 at 16:06 -0400, Alexander Duyck wrote:
> The code for cloning the skb for an acknowledgement was checking to see if
> the cloned skb was shared and if it was it was then freeing the original
> skb. Since a clone should never really be shared I suspect that the
> intention was to avoid freeing the clone if the original was shared. As
> such I am updating the code so that if the original is shared we free the
> original and use the clone. This avoids unnecessary work in the next
> section where we would be cloning the skb if the original is shared.
Thanks, yeah, I admit that this is clearly fishy.
> @@ -2087,7 +2087,7 @@ netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff
> *skb,
> if (id >= 0) {
> info_id = id;
> info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
Luckily, we practically always go into this path.
> - } else if (skb_shared(skb)) {
> + } else if (skb_shared(orig_skb)) {
> kfree_skb(orig_skb);
> } else {
> kfree_skb(skb);
We have a clone already so we could just remove the whole "else if" I
think, but I'm guessing my intent was to keep it accounted to the socket
where possible rather than freeing the original in all cases.
So yeah, I think this makes sense. Maybe we should add a comment to the
if though to explain this?
johannes
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