net: mvneta - Fixed recv() when multiple packets have arrived.

This patch fixes a problem in the mvneta driver where if more than
one packet arrives between calls to mvneta_recv(), the additional
descriptors will be marked as free even though only one descriptor
has been read and processed from the receive queue.  This causes
the additional packet(s) to be delayed until the next packet arrives.
>From this point on all packets will be delayed because the receive
queue will contain unprocessed packets but the hardware shows no
busy descriptors.

Signed-off-by: Jason Brown <jason.brown@apcon.com>
Reviewed-by: Stefan Roese <sr@denx.de>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

diff --git a/drivers/net/mvneta.c b/drivers/net/mvneta.c
index f1be9521a916ba97b183d68a918f52f990699779..83e31537688163a155e97687e7706570c5e5c7e0 100644 (file)
--- a/drivers/net/mvneta.c
+++ b/drivers/net/mvneta.c
@@ -1654,7 +1654,11 @@ static int mvneta_recv(struct udevice *dev, int flags, uchar **packetp)
                 */
                *packetp = data;
 
-               mvneta_rxq_desc_num_update(pp, rxq, rx_done, rx_done);
+               /*
+                * Only mark one descriptor as free
+                * since only one was processed
+                */
+               mvneta_rxq_desc_num_update(pp, rxq, 1, 1);
        }
 
        return rx_bytes;