linux-kernel - Re: [PATCH net v2] stmmac: dwmac-mediatek: fix clock issue

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <a748f941c39d46f749dfcd17e881b07242f5bfaf.camel@mediatek.com>
Date:   Fri, 8 Jul 2022 16:32:57 +0800
From:   Biao Huang <biao.huang@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        David Miller <davem@...emloft.net>
CC:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        "Eric Dumazet" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "Paolo Abeni" <pabeni@...hat.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        <netdev@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <macpaul.lin@...iatek.com>
Subject: Re: [PATCH net v2] stmmac: dwmac-mediatek: fix clock issue

Dear Matthias,

	Thanks for your comments.

Best Regards!
Biao
On Fri, 2022-07-08 at 10:17 +0200, Matthias Brugger wrote:
> 
> On 08/07/2022 09:56, Biao Huang wrote:
> > Since clocks are handled in mediatek_dwmac_clks_config(),
> > remove the clocks configuration in init()/exit(), and
> > invoke mediatek_dwmac_clks_config instead.
> > 
> > This issue is found in suspend/resume test.
> > 
> > Fixes: 3186bdad97d5 ("stmmac: dwmac-mediatek: add platform level
> > clocks management")
> > Signed-off-by: Biao Huang <biao.huang@...iatek.com>
> > ---
> >   .../ethernet/stmicro/stmmac/dwmac-mediatek.c  | 32 ++++++------
> > -------
> >   1 file changed, 10 insertions(+), 22 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> > b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> > index 6ff88df58767..6d82cf2658e0 100644
> > --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> > +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c
> > @@ -576,32 +576,12 @@ static int mediatek_dwmac_init(struct
> > platform_device *pdev, void *priv)
> >   		}
> >   	}
> >   
> > -	ret = clk_bulk_prepare_enable(variant->num_clks, plat->clks);
> > -	if (ret) {
> > -		dev_err(plat->dev, "failed to enable clks, err = %d\n",
> > ret);
> > -		return ret;
> > -	}
> > -
> > -	ret = clk_prepare_enable(plat->rmii_internal_clk);
> > -	if (ret) {
> > -		dev_err(plat->dev, "failed to enable rmii internal clk,
> > err = %d\n", ret);
> > -		goto err_clk;
> > -	}
> > -
> >   	return 0;
> > -
> > -err_clk:
> > -	clk_bulk_disable_unprepare(variant->num_clks, plat->clks);
> > -	return ret;
> >   }
> >   
> >   static void mediatek_dwmac_exit(struct platform_device *pdev,
> > void *priv)
> >   {
> > -	struct mediatek_dwmac_plat_data *plat = priv;
> > -	const struct mediatek_dwmac_variant *variant = plat->variant;
> > -
> > -	clk_disable_unprepare(plat->rmii_internal_clk);
> > -	clk_bulk_disable_unprepare(variant->num_clks, plat->clks);
> > +	/* nothing to do now */
> 
> We can just leave the function pointer point to NULL, that get
> checked before 
> calling exit.
OK, I'll delete this function, 
and delete the exit assignment: 
	plat->exit = mediatek_dwmac_exit;
it should be ok since plat is allocated by devm_kzalloc.
> 
> Regards,
> Matthias
> 
> >   }
> >   
> >   static int mediatek_dwmac_clks_config(void *priv, bool enabled)
> > @@ -712,13 +692,21 @@ static int mediatek_dwmac_probe(struct
> > platform_device *pdev)
> >   	mediatek_dwmac_common_data(pdev, plat_dat, priv_plat);
> >   	mediatek_dwmac_init(pdev, priv_plat);
> >   
> > +	ret = mediatek_dwmac_clks_config(priv_plat, true);
> > +	if (ret)
> > +		return ret;
> > +
> >   	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
> >   	if (ret) {
> >   		stmmac_remove_config_dt(pdev, plat_dat);
> > -		return ret;
> > +		goto err_drv_probe;
> >   	}
> >   
> >   	return 0;
> > +
> > +err_drv_probe:
> > +	mediatek_dwmac_clks_config(priv_plat, false);
> > +	return ret;
> >   }
> >   
> >   static const struct of_device_id mediatek_dwmac_match[] = {