net: ethoc: enable NAPI before poll may be scheduled

[ Upstream commit d220b942a4b6a0640aee78841608f4aa5e8e185e ]

ethoc_reset enables device interrupts, ethoc_interrupt may schedule a
NAPI poll before NAPI is enabled in the ethoc_open, which results in
device being unable to send or receive anything until it's closed and
reopened. In case the device is flooded with ingress packets it may be
unable to recover at all.
Move napi_enable above ethoc_reset in the ethoc_open to fix that.

Fixes: a1702857724f ("net: Add support for the OpenCores 10/100 Mbps Ethernet MAC.")
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Reviewed-by: Tobias Klauser <tklauser@distanz.ch>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/ethoc.c b/drivers/net/ethernet/ethoc.c
index c044667a0a25ec6e5973f4ba1d15c4eb54b829d2..e31199f3048caf388d382d753e4b5b513eda6e34 100644 (file)
--- a/drivers/net/ethernet/ethoc.c
+++ b/drivers/net/ethernet/ethoc.c
@@ -710,6 +710,8 @@ static int ethoc_open(struct net_device *dev)
        if (ret)
                return ret;
 
+       napi_enable(&priv->napi);
+
        ethoc_init_ring(priv, dev->mem_start);
        ethoc_reset(priv);
 
@@ -722,7 +724,6 @@ static int ethoc_open(struct net_device *dev)
        }
 
        phy_start(dev->phydev);
-       napi_enable(&priv->napi);
 
        if (netif_msg_ifup(priv)) {
                dev_info(&dev->dev, "I/O: %08lx Memory: %08lx-%08lx\n",