net: correct comment on where to place transmit time stamp hook.
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: NRichard Cochran <richard.cochran@omicron.at> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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