From: Trevor Woerner <twoerner@gmail.com> To: linux-kernel@vger.kernel.org Cc: Vladimir Zapolskiy <vz@mleia.com>, "David S. Miller" <davem@davemloft.net>, Jakub Kicinski <kuba@kernel.org>, linux-arm-kernel@lists.infradead.org (moderated list:ARM/LPC32XX SOC SUPPORT), netdev@vger.kernel.org (open list:NETWORKING DRIVERS) Subject: [PATCH] net: nxp: lpc_eth.c: avoid hang when bringing interface down Date: Sun, 24 Oct 2021 13:50:02 -0400 [thread overview] Message-ID: <20211024175003.7879-1-twoerner@gmail.com> (raw) 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. Signed-off-by: Trevor Woerner <twoerner@gmail.com> --- drivers/net/ethernet/nxp/lpc_eth.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c index d29fe562b3de..c910fa2f40a4 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; -- 2.30.0.rc0
WARNING: multiple messages have this Message-ID (diff)
From: Trevor Woerner <twoerner@gmail.com> To: linux-kernel@vger.kernel.org Cc: Vladimir Zapolskiy <vz@mleia.com>, "David S. Miller" <davem@davemloft.net>, Jakub Kicinski <kuba@kernel.org>, linux-arm-kernel@lists.infradead.org (moderated list:ARM/LPC32XX SOC SUPPORT), netdev@vger.kernel.org (open list:NETWORKING DRIVERS) Subject: [PATCH] net: nxp: lpc_eth.c: avoid hang when bringing interface down Date: Sun, 24 Oct 2021 13:50:02 -0400 [thread overview] Message-ID: <20211024175003.7879-1-twoerner@gmail.com> (raw) 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. Signed-off-by: Trevor Woerner <twoerner@gmail.com> --- drivers/net/ethernet/nxp/lpc_eth.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/net/ethernet/nxp/lpc_eth.c b/drivers/net/ethernet/nxp/lpc_eth.c index d29fe562b3de..c910fa2f40a4 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; -- 2.30.0.rc0 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2021-10-24 17:50 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-10-24 17:50 Trevor Woerner [this message] 2021-10-24 17:50 ` [PATCH] net: nxp: lpc_eth.c: avoid hang when bringing interface down Trevor Woerner 2021-10-24 19:55 ` Vladimir Zapolskiy 2021-10-24 19:55 ` Vladimir Zapolskiy 2021-10-25 14:50 ` patchwork-bot+netdevbpf 2021-10-25 14:50 ` patchwork-bot+netdevbpf
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