linux-kernel - Re: [PATCH] net: stmmac: dwmac-sun8i: Use reset exclusive

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Message-ID: <20170825144832.3w6izhri5vstbndp@flea.lan>
Date:   Fri, 25 Aug 2017 16:48:32 +0200
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Corentin Labbe <clabbe.montjoie@...il.com>
Cc:     peppe.cavallaro@...com, alexandre.torgue@...com, wens@...e.org,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: stmmac: dwmac-sun8i: Use reset exclusive

On Fri, Aug 25, 2017 at 04:38:05PM +0200, Corentin Labbe wrote:
> The current dwmac_sun8i module cannot be rmmod/modprobe due to that
> the reset controller was not released when removed.
> 
> This patch remove ambiguity, by using of_reset_control_get_exclusive and
> add the missing reset_control_put().
> 
> Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> index fffd6d5fc907..675a09629d85 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-sun8i.c
> @@ -782,6 +782,7 @@ static int sun8i_dwmac_unpower_internal_phy(struct sunxi_priv_data *gmac)
>  
>  	clk_disable_unprepare(gmac->ephy_clk);
>  	reset_control_assert(gmac->rst_ephy);
> +	reset_control_put(gmac->rst_ephy);
>  	return 0;
>  }
>  
> @@ -942,7 +943,7 @@ static int sun8i_dwmac_probe(struct platform_device *pdev)
>  			return -EINVAL;
>  		}
>  
> -		gmac->rst_ephy = of_reset_control_get(plat_dat->phy_node, NULL);
> +		gmac->rst_ephy = of_reset_control_get_exclusive(plat_dat->phy_node, NULL);

Why not just use devm_reset_control_get?

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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