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net: Add some clarification to skb_tx_timestamp() comment. 

We've seen so many instances of people invoking skb_tx_timestamp()
after the device already has been given the packet, that it's worth
being a little bit more verbose and explicit in this comment.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2013-12-27 13:04:33 -05:00
parent 37ec274e97
commit 73409f3b0f
1 changed files with 4 additions and 0 deletions
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4
include/linux/skbuff.h
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@ -2531,6 +2531,10 @@ static inline void sw_tx_timestamp(struct sk_buff *skb)
* Ethernet MAC Drivers should call this function in their hard_xmit()
* function immediately before giving the sk_buff to the MAC hardware.
*
* Specifically, one should make absolutely sure that this function is
* called before TX completion of this packet can trigger. Otherwise
* the packet could potentially already be freed.
*
* @skb: A socket buffer.
*/
static inline void skb_tx_timestamp(struct sk_buff *skb)