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inetis enet: disallow transmit when the queue is full

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Andrew Webster 2016-01-21 18:45:46 -06:00 committed by Gregory Nutt
parent a3f8be04ac
commit c1a8443416
1 changed files with 10 additions and 0 deletions
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10
arch/arm/src/kinetis/kinetis_enet.c
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@ -347,6 +347,16 @@ static int kinetis_transmit(FAR struct kinetis_driver_s *priv)
struct enet_desc_s *txdesc;
uint32_t regval;
/* Since this can be called from kinetis_receive, it is possible that
* the transmit queue is full, so check for that now. If this is the
* case, the outgoing packet will be dropped (e.g. an ARP reply)
*/
if (kinetics_txringfull(priv))
{
return -EBUSY;
}
/* When we get here the TX descriptor should show that the previous
* transfer has completed. If we get here, then we are committed to
* sending a packet; Higher level logic must have assured that there is