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

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Date:   Wed, 30 Nov 2016 02:18:57 +0200
From:   Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Mugunthan V N <mugunthanvnm@...com>,
        Sekhar Nori <nsekhar@...com>, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, Dave Gerlach <d-gerlach@...com>
Subject: Re: [PATCH] net: ethernet: ti: cpsw: fix ASSERT_RTNL() warning
 during resume

On Tue, Nov 29, 2016 at 04:27:03PM -0600, Grygorii Strashko wrote:
> netif_set_real_num_tx/rx_queues() 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_resume()
> |- cpsw_ndo_open()
>   |- netif_set_real_num_tx/rx_queues()
>      |- ASSERT_RTNL();
> 
> Hence, fix it by surrounding cpsw_ndo_open() by rtnl_lock/unlock() calls.
> 
> Cc: Dave Gerlach <d-gerlach@...com>
> Cc: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
> Fixes: commit e05107e6b747 ("net: ethernet: ti: cpsw: add multi queue support")
> Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
Reviewed-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>

> ---
>  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 ae1ec6a..fd6c03b 100644
> --- a/drivers/net/ethernet/ti/cpsw.c
> +++ b/drivers/net/ethernet/ti/cpsw.c
> @@ -2944,6 +2944,8 @@ static int cpsw_resume(struct device *dev)
>  	/* 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;
>  
> @@ -2955,6 +2957,8 @@ static int cpsw_resume(struct device *dev)
>  		if (netif_running(ndev))
>  			cpsw_ndo_open(ndev);
>  	}
> +	rtnl_unlock();
> +
>  	return 0;
>  }
>  #endif
> -- 
> 2.10.1
>