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[NET]: Document ->hard_start_xmit() locking in comments.

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Signed-off-by: David S. Miller <davem@davemloft.net>
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Ben Greear 2005-04-24 20:12:36 -07:00 committed by David S. Miller
parent db75307979
commit af191367a7
1 changed files with 13 additions and 0 deletions
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13
net/core/dev.c
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@ -1214,6 +1214,19 @@ int __skb_linearize(struct sk_buff *skb, int gfp_mask)
* A negative errno code is returned on a failure. A success does not * A negative errno code is returned on a failure. A success does not
* guarantee the frame will be transmitted as it may be dropped due * guarantee the frame will be transmitted as it may be dropped due
* to congestion or traffic shaping. * to congestion or traffic shaping.
*
* -----------------------------------------------------------------------------------
* I notice this method can also return errors from the queue disciplines,
* including NET_XMIT_DROP, which is a positive value. So, errors can also
* be positive.
*
* Regardless of the return value, the skb is consumed, so it is currently
* difficult to retry a send to this method. (You can bump the ref count
* before sending to hold a reference for retry if you are careful.)
*
* When calling this method, interrupts MUST be enabled. This is because
* the BH enable code must have IRQs enabled so that it will not deadlock.
* --BLG
*/ */
int dev_queue_xmit(struct sk_buff *skb) int dev_queue_xmit(struct sk_buff *skb)