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

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Message-ID: <20170830102136.GA21940@Red>
Date:   Wed, 30 Aug 2017 12:21:36 +0200
From:   Corentin Labbe <clabbe.montjoie@...il.com>
To:     Maxime Ripard <maxime.ripard@...e-electrons.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 07:12:33PM +0200, Maxime Ripard wrote:
> On Fri, Aug 25, 2017 at 05:17:33PM +0200, Corentin Labbe wrote:
> > On Fri, Aug 25, 2017 at 04:48:32PM +0200, Maxime Ripard wrote:
> > > 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?
> > > 
> > 
> > Because there no devm_ functions with of_
> 
> devm_reset_control_get uses of_reset_control_get internally.

Hello

You are right.
But since the ephy reset is in a child node, devm_ does not find it.

Regards