linux-kernel - Re: [PATCH] net: ethernet: ti: cpsw: fix ASSERT

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Date:   Fri, 22 May 2020 11:50:40 -0500
From:   Suman Anna <s-anna@...com>
To:     Grygorii Strashko <grygorii.strashko@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     <netdev@...r.kernel.org>, Sekhar Nori <nsekhar@...com>,
        <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH] net: ethernet: ti: cpsw: fix ASSERT_RTNL() warning during
 suspend

On 5/22/20 11:39 AM, Grygorii Strashko wrote:
> vlan_for_each() are required to be called with rtnl_lock taken, otherwise
> ASSERT_RTNL() warning will be triggered - which happens now during System
> resume from suspend:
>    cpsw_suspend()
>    |- cpsw_ndo_stop()
>      |- __hw_addr_ref_unsync_dev()
>        |- cpsw_purge_all_mc()
>           |- vlan_for_each()
>              |- ASSERT_RTNL();
> 
> Hence, fix it by surrounding cpsw_ndo_stop() by rtnl_lock/unlock() calls.
> 
> Fixes: 15180eca569b net: ethernet: ti: cpsw: fix vlan mcast

Format for this should be
Fixes: 15180eca569b ("net: ethernet: ti: cpsw: fix vlan mcast")

regards
Suman

> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
> ---
>   drivers/net/ethernet/ti/cpsw.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/net/ethernet/ti/cpsw.c b/drivers/net/ethernet/ti/cpsw.c
> index c2c5bf87da01..ffeb8633e530 100644
> --- a/drivers/net/ethernet/ti/cpsw.c
> +++ b/drivers/net/ethernet/ti/cpsw.c
> @@ -1753,11 +1753,15 @@ static int cpsw_suspend(struct device *dev)
>   	struct cpsw_common *cpsw = dev_get_drvdata(dev);
>   	int i;
>   
> +	rtnl_lock();
> +
>   	for (i = 0; i < cpsw->data.slaves; i++)
>   		if (cpsw->slaves[i].ndev)
>   			if (netif_running(cpsw->slaves[i].ndev))
>   				cpsw_ndo_stop(cpsw->slaves[i].ndev);
>   
> +	rtnl_unlock();
> +
>   	/* Select sleep pin state */
>   	pinctrl_pm_select_sleep_state(dev);
>   
>