netdev - RE: [PATCH] LF-2678 net: ethernet: stmmac: delete the eee_ctrl

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Date:   Wed, 2 Dec 2020 09:12:28 +0000
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     Joakim Zhang <qiangqing.zhang@....com>,
        "peppe.cavallaro@...com" <peppe.cavallaro@...com>,
        "alexandre.torgue@...com" <alexandre.torgue@...com>,
        "joabreu@...opsys.com" <joabreu@...opsys.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH] LF-2678 net: ethernet: stmmac: delete the eee_ctrl_timer
 after napi disabled


Hi,

Please ignore this patch due to wrongly send out. Sorry.

Best Regards,
Joakim Zhang

> -----Original Message-----
> From: Joakim Zhang <qiangqing.zhang@....com>
> Sent: 2020年12月2日 17:00
> To: peppe.cavallaro@...com; alexandre.torgue@...com;
> joabreu@...opsys.com
> Cc: davem@...emloft.net; kuba@...nel.org; netdev@...r.kernel.org;
> dl-linux-imx <linux-imx@....com>
> Subject: [PATCH] LF-2678 net: ethernet: stmmac: delete the eee_ctrl_timer
> after napi disabled
> 
> From: Fugang Duan <fugang.duan@....com>
> 
> There have chance to re-enable the eee_ctrl_timer and fire the timer in napi
> callback after delete the timer in .stmmac_release(), which introduces to
> access eee registers in the timer function after clocks are disabled then causes
> system hang.
> 
> It is safe to delete the timer after napi disabled and disable lpi mode.
> 
> Tested-by: Joakim Zhang <qiangqing.zhang@....com>
> Reviewed-by: Joakim Zhang <qiangqing.zhang@....com>
> Signed-off-by: Fugang Duan <fugang.duan@....com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index cc1f17b170f0..7e655fa34589 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -2933,9 +2933,6 @@ static int stmmac_release(struct net_device *dev)
>  	struct platform_device *pdev = to_platform_device(priv->device);
>  	u32 chan;
> 
> -	if (priv->eee_enabled)
> -		del_timer_sync(&priv->eee_ctrl_timer);
> -
>  	if (device_may_wakeup(priv->device))
>  		phylink_speed_down(priv->phylink, false);
>  	/* Stop and disconnect the PHY */
> @@ -2954,6 +2951,11 @@ static int stmmac_release(struct net_device *dev)
>  	if (priv->lpi_irq > 0)
>  		free_irq(priv->lpi_irq, dev);
> 
> +	if (priv->eee_enabled) {
> +		priv->tx_path_in_lpi_mode = false;
> +		del_timer_sync(&priv->eee_ctrl_timer);
> +	}
> +
>  	/* Stop TX/RX DMA and clear the descriptors */
>  	stmmac_stop_all_dma(priv);
> 
> @@ -5224,6 +5226,11 @@ int stmmac_suspend(struct device *dev)
>  	for (chan = 0; chan < priv->plat->tx_queues_to_use; chan++)
>  		del_timer_sync(&priv->tx_queue[chan].txtimer);
> 
> +	if (priv->eee_enabled) {
> +		priv->tx_path_in_lpi_mode = false;
> +		del_timer_sync(&priv->eee_ctrl_timer);
> +	}
> +
>  	/* Stop TX/RX DMA */
>  	stmmac_stop_all_dma(priv);
> 
> --
> 2.17.1