linux-kernel - Re: [PATCH] drm/bridge: anx7625: Fix not correct get property counts

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Message-ID: <YipJR6ERQM598/XE@ravnborg.org>
Date:   Thu, 10 Mar 2022 19:53:59 +0100
From:   Sam Ravnborg <sam@...nborg.org>
To:     Xin Ji <xji@...logixsemi.com>
Cc:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, qwen@...logixsemi.com,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        mliu@...logixsemi.com, hsinyi@...omium.org, bliang@...logixsemi.com
Subject: Re: [PATCH] drm/bridge: anx7625: Fix not correct get property counts

Hi Xin,

On Thu, Mar 10, 2022 at 05:16:53PM +0800, Xin Ji wrote:
> The property length which returns from "of_get_property", divided by
> sizeof(int) to get the total property counts.
> 
> Fixes: fd0310b6fe7d ("drm/bridge: anx7625: add MIPI DPI input feature")
> 
> Signed-off-by: Xin Ji <xji@...logixsemi.com>
> ---
>  drivers/gpu/drm/bridge/analogix/anx7625.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
> index c6a9a02ed762..87081d5b408d 100644
> --- a/drivers/gpu/drm/bridge/analogix/anx7625.c
> +++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
> @@ -1594,6 +1594,7 @@ static int anx7625_get_swing_setting(struct device *dev,
>  
>  	if (of_get_property(dev->of_node,
>  			    "analogix,lane0-swing", &num_regs)) {
> +		num_regs /= sizeof(int);

Since the property is an array maybe use: of_property_read_u8_array()

	Sam