net: sonic: return NETDEV_TX_OK if failed to map buffer

BugLink: https://bugs.launchpad.net/bugs/1863019
[ Upstream commit 6e1cdedcf0362fed3aedfe051d46bd7ee2a85fe1 ]

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 <maowenan@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/net/ethernet/natsemi/sonic.c b/drivers/net/ethernet/natsemi/sonic.c
index 23821540ab078de3aafcb07c781e7f5ebc932299..11f472fd5d477fc3b0f061cdacac87397dd7401e 100644 (file)
--- a/drivers/net/ethernet/natsemi/sonic.c
+++ b/drivers/net/ethernet/natsemi/sonic.c
@@ -221,9 +221,9 @@ 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 */