net: nxp: lpc_eth.c: avoid hang when bringing interface down

commit ace19b992436a257d9a793672e57abc28fe83e2e upstream.

A hard hang is observed whenever the ethernet interface is brought
down. If the PHY is stopped before the LPC core block is reset,
the SoC will hang. Comparing lpc_eth_close() and lpc_eth_open() I
re-arranged the ordering of the functions calls in lpc_eth_close() to
reset the hardware before stopping the PHY.
Fixes: 75aecfae9131 ("lpc32xx: Added ethernet driver")
Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Acked-by: Vladimir Zapolskiy <vz@mleia.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/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c
index 1d59ef367a85cee120a09e8a843aee28a754b4c4..3b177421651f1bf186530df862c47c89168b5f7f 100644 (file)
--- a/drivers/net/ethernet/nxp/lpc_eth.c
+++ b/drivers/net/ethernet/nxp/lpc_eth.c
@@ -1007,9 +1007,6 @@ static int lpc_eth_close(struct net_device *ndev)
        napi_disable(&pldat->napi);
        netif_stop_queue(ndev);
 
-       if (ndev->phydev)
-               phy_stop(ndev->phydev);
-
        spin_lock_irqsave(&pldat->lock, flags);
        __lpc_eth_reset(pldat);
        netif_carrier_off(ndev);
@@ -1017,6 +1014,8 @@ static int lpc_eth_close(struct net_device *ndev)
        writel(0, LPC_ENET_MAC2(pldat->net_base));
        spin_unlock_irqrestore(&pldat->lock, flags);
 
+       if (ndev->phydev)
+               phy_stop(ndev->phydev);
        clk_disable_unprepare(pldat->clk);
 
        return 0;