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net: correct comment on where to place transmit time stamp hook.

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The comment for the skb_tx_timestamp() function suggests calling it just
after a buffer is released to the hardware for transmission. However,
for drivers that free the buffer in an ISR, this produces a race between
the time stamp code and the ISR. This commit changes the comment to advise
placing the call just before handing the buffer over to the hardware.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Cochran 2011-06-19 03:31:39 +00:00 committed by David S. Miller
parent fd112f2e15
commit 4ff75b7cf3
1 changed files with 1 additions and 2 deletions
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3
include/linux/skbuff.h
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@ -2023,8 +2023,7 @@ static inline void sw_tx_timestamp(struct sk_buff *skb)
* skb_tx_timestamp() - Driver hook for transmit timestamping
*
* Ethernet MAC Drivers should call this function in their hard_xmit()
* function as soon as possible after giving the sk_buff to the MAC
* hardware, but before freeing the sk_buff.
* function immediately before giving the sk_buff to the MAC hardware.
*
* @skb: A socket buffer.
*/