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

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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: b7370112f519 ("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>
This commit is contained in:
Trevor Woerner 2021-10-24 13:50:02 -04:00 committed by Greg Kroah-Hartman
parent 06ccfe9b31
commit d8b6d0b5de
1 changed files with 2 additions and 3 deletions
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5
drivers/net/ethernet/nxp/lpc_eth.c
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@ -1039,9 +1039,6 @@ 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);
@ -1049,6 +1046,8 @@ 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;