linux-kernel - Re: [PATCH v4, 25/33] drm/mediatek: add clock property check before get it

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

Date:   Wed, 17 Jul 2019 15:01:48 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     <yongqiang.niu@...iatek.com>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "David Airlie" <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v4, 25/33] drm/mediatek: add clock property check before
 get it

Hi, Yongqiang:

On Tue, 2019-07-09 at 06:34 +0800, yongqiang.niu@...iatek.com wrote:
> From: Yongqiang Niu <yongqiang.niu@...iatek.com>
> 
> This patch add clock property check before get it
> 
> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_ddp.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> index c57e7ab..a9d3e27 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> @@ -668,10 +668,12 @@ static int mtk_ddp_probe(struct platform_device *pdev)
>  	for (i = 0; i < 10; i++)
>  		ddp->mutex[i].id = i;
>  
> -	ddp->clk = devm_clk_get(dev, NULL);
> -	if (IS_ERR(ddp->clk)) {
> -		dev_err(dev, "Failed to get clock\n");
> -		return PTR_ERR(ddp->clk);
> +	if (of_find_property(dev->of_node, "clocks", &i)) {
> +		ddp->clk = devm_clk_get(dev, NULL);
> +		if (IS_ERR(ddp->clk)) {
> +			dev_err(dev, "Failed to get clock\n");
> +			return PTR_ERR(ddp->clk);
> +		}

Only "mediatek,mt8133-disp-mutex" has no clock property. For other SoC,
clock property is required. So I think this exception is just for
mt8183.

Regards,
CK

>  	}
>  
>  	regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);