From: Trevor Woerner Date: Sun, 24 Oct 2021 17:50:02 +0000 (-0400) Subject: net: nxp: lpc_eth.c: avoid hang when bringing interface down X-Git-Tag: v5.15~16^2~27 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=ace19b992436a257d9a793672e57abc28fe83e2e;p=platform%2Fkernel%2Flinux-starfive.git net: nxp: lpc_eth.c: avoid hang when bringing interface down 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 Acked-by: Vladimir Zapolskiy Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c index d29fe56..c910fa2 100644 --- a/drivers/net/ethernet/nxp/lpc_eth.c +++ b/drivers/net/ethernet/nxp/lpc_eth.c @@ -1015,9 +1015,6 @@ 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); @@ -1025,6 +1022,8 @@ 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;