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authorDavid S. Miller <davem@davemloft.net>2013-12-27 13:04:33 -0500
committerDavid S. Miller <davem@davemloft.net>2013-12-27 13:04:33 -0500
commit73409f3b0ff0ae7bc1f647936b23e6d5d5dcbe28 (patch)
tree51dbcef70dc3b374e6e720aa5fde10f783301277 /include
parent37ec274e9713eafc2ba6c4471420f06cb8f68ecf (diff)
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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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/skbuff.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 6aae83890520..6f69b3f914fb 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -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)