Re: [PATCH] net: ethernet: ti: cpsw: Fix suspend/resume break

[Ivan Khoronzhuk <ivan.khoronzhuk@xxxxxxxxxx>]

On Sat, Jun 22, 2019 at 04:01:40PM +0530, Keerthy wrote:

Hi Keerty,

> Commit bfe59032bd6127ee190edb30be9381a01765b958 ("net: ethernet:
> ti: cpsw: use cpsw as drv data")changes
> the driver data to struct cpsw_common *cpsw. This is done
> only in probe/remove but the suspend/resume functions are
> still left with struct net_device *ndev. Hence fix both
> suspend & resume also to fetch the updated driver data.
>
> Fixes: bfe59032bd6127ee1 ("net: ethernet: ti: cpsw: use cpsw as drv data")
> Signed-off-by: Keerthy <j-keerthy@xxxxxx>
> ---
> drivers/net/ethernet/ti/cpsw.c | 36 +++++++++++-----------------------
> 1 file changed, 11 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> index 7bdd287074fc..2aeaad15e20e 100644
> --- a/drivers/net/ethernet/ti/cpsw.c
> +++ b/drivers/net/ethernet/ti/cpsw.c
> @@ -2590,20 +2590,12 @@ static int cpsw_remove(struct platform_device *pdev)
> #ifdef CONFIG_PM_SLEEP
> static int cpsw_suspend(struct device *dev)
> {
> -	struct net_device	*ndev = dev_get_drvdata(dev);
> -	struct cpsw_common	*cpsw = ndev_to_cpsw(ndev);
> -
> -	if (cpsw->data.dual_emac) {
> -		int i;
> +	struct cpsw_common *cpsw = dev_get_drvdata(dev);
> +	int i;
>
> -		for (i = 0; i < cpsw->data.slaves; i++) {
> -			if (netif_running(cpsw->slaves[i].ndev))
> -				cpsw_ndo_stop(cpsw->slaves[i].ndev);
> -		}
> -	} else {
> -		if (netif_running(ndev))
> -			cpsw_ndo_stop(ndev);
> -	}
> +	for (i = 0; i < cpsw->data.slaves; i++)
> +		if (netif_running(cpsw->slaves[i].ndev))
Seems I've missed to add this, but in your fix potential issue in switch mode.
ndev is not necessarily present for slave, you need to check on ndev != null
before using it, if you still remove cpsw->data.dual_emac ofc.

Thanks.

> +			cpsw_ndo_stop(cpsw->slaves[i].ndev);
>
> 	/* Select sleep pin state */
> 	pinctrl_pm_select_sleep_state(dev);
> @@ -2613,25 +2605,19 @@ static int cpsw_suspend(struct device *dev)
>
> static int cpsw_resume(struct device *dev)
> {
> -	struct net_device	*ndev = dev_get_drvdata(dev);
> -	struct cpsw_common	*cpsw = ndev_to_cpsw(ndev);
> +	struct cpsw_common *cpsw = dev_get_drvdata(dev);
> +	int i;
>
> 	/* Select default pin state */
> 	pinctrl_pm_select_default_state(dev);
>
> 	/* shut up ASSERT_RTNL() warning in netif_set_real_num_tx/rx_queues */
> 	rtnl_lock();
> -	if (cpsw->data.dual_emac) {
> -		int i;
>
> -		for (i = 0; i < cpsw->data.slaves; i++) {
> -			if (netif_running(cpsw->slaves[i].ndev))
> -				cpsw_ndo_open(cpsw->slaves[i].ndev);
> -		}
> -	} else {
> -		if (netif_running(ndev))
> -			cpsw_ndo_open(ndev);
> -	}
> +	for (i = 0; i < cpsw->data.slaves; i++)
> +		if (netif_running(cpsw->slaves[i].ndev))
> +			cpsw_ndo_open(cpsw->slaves[i].ndev);
> +
same here

> 	rtnl_unlock();
>
> 	return 0;
> --
> 2.17.1

--
Regards,
Ivan Khoronzhuk