[PATCH v2 net] net: sonic: return NETDEV_TX_OK if failed to map buffer

[Mao Wenan]

NETDEV_TX_BUSY really should only be used by drivers that call
netif_tx_stop_queue() at the wrong moment. If dma_map_single() is
failed to map tx DMA buffer, it might trigger an infinite loop.
This patch use NETDEV_TX_OK instead of NETDEV_TX_BUSY, and change
printk to pr_err_ratelimited.

Fixes: d9fb9f384292 ("*sonic/natsemi/ns83829: Move the National Semi-conductor 
drivers")
Signed-off-by: Mao Wenan <maowe...@huawei.com>
---
 v2: change subject and description of patch, use NETDEV_TX_OK instead of 
NETDEV_TX_BUSY.
 drivers/net/ethernet/natsemi/sonic.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/natsemi/sonic.c 
b/drivers/net/ethernet/natsemi/sonic.c
index d0a01e8f000a..18fd62fbfb64 100644
--- a/drivers/net/ethernet/natsemi/sonic.c
+++ b/drivers/net/ethernet/natsemi/sonic.c
@@ -232,9 +232,9 @@ static int sonic_send_packet(struct sk_buff *skb, struct 
net_device *dev)
 
        laddr = dma_map_single(lp->device, skb->data, length, DMA_TO_DEVICE);
        if (!laddr) {
-               printk(KERN_ERR "%s: failed to map tx DMA buffer.\n", 
dev->name);
+               pr_err_ratelimited("%s: failed to map tx DMA buffer.\n", 
dev->name);
                dev_kfree_skb(skb);
-               return NETDEV_TX_BUSY;
+               return NETDEV_TX_OK;
        }
 
        sonic_tda_put(dev, entry, SONIC_TD_STATUS, 0);       /* clear status */
-- 
2.20.1