net: bcmgenet: fix off-by-one in incrementing read pointer

Commit b629be5c8399d7c423b92135eb43a86c924d1cbc ("net: bcmgenet: check
harder for out of memory conditions") moved the increment of the local
read pointer *before* reading from the hardware descriptor using
dmadesc_get_length_status(), which creates an off-by-one situation.

Fix this by moving again the read_ptr increment after we have read the
hardware descriptor to get both the control block and the read pointer
back in sync.

Fixes: b629be5c8399 ("net: bcmgenet: check harder for out of memory conditions")
Signed-off-by: Jaedon Shin <jaedon.shin@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Petri Gynther <pgynther@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index fff2634b6f34..fdc9ec09e453 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -1285,11 +1285,6 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_priv *priv,
                 cb = &priv->rx_cbs[priv->rx_read_ptr];
                 skb = cb->skb;
 
-                rxpktprocessed++;
-
-                priv->rx_read_ptr++;
-                priv->rx_read_ptr &= (priv->num_rx_bds - 1);
-
                 /* We do not have a backing SKB, so we do not have a
                  * corresponding DMA mapping for this incoming packet since
                  * bcmgenet_rx_refill always either has both skb and mapping or
@@ -1404,6 +1399,10 @@ refill:
                 err = bcmgenet_rx_refill(priv, cb);
                 if (err)
                         netif_err(priv, rx_err, dev, "Rx refill failed\n");
+
+                rxpktprocessed++;
+                priv->rx_read_ptr++;
+                priv->rx_read_ptr &= (priv->num_rx_bds - 1);
         }
 
         return rxpktprocessed;