linux-kernel - RE: [PATCH v3] drm/bridge: it6505: fix HDCP V match check is not performed correctly

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Message-ID: <71b5a3243edc4765a4529d1254d7b7bc@ite.com.tw>
Date: Fri, 10 Jan 2025 02:00:35 +0000
From: <Hermes.Wu@....com.tw>
To: <dmitry.baryshkov@...aro.org>
CC: <andrzej.hajda@...el.com>, <neil.armstrong@...aro.org>, <rfoss@...nel.org>,
        <Laurent.pinchart@...asonboard.com>, <jonas@...boo.se>,
        <jernej.skrabec@...il.com>, <maarten.lankhorst@...ux.intel.com>,
        <mripard@...nel.org>, <tzimmermann@...e.de>, <airlied@...il.com>,
        <simona@...ll.ch>, <angelogioacchino.delregno@...labora.com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <Pet.Weng@....com.tw>, <Kenneth.Hung@....com.tw>,
        <treapking@...omium.org>
Subject: RE: [PATCH v3] drm/bridge: it6505: fix HDCP V match check is not
 performed correctly

hi


-----Original Message-----
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org> 
Sent: Thursday, January 9, 2025 9:09 PM
To: Hermes Wu (吳佳宏) <Hermes.Wu@....com.tw>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>; Neil Armstrong <neil.armstrong@...aro.org>; Robert Foss <rfoss@...nel.org>; Laurent Pinchart <Laurent.pinchart@...asonboard.com>; Jonas Karlman <jonas@...boo.se>; Jernej Skrabec <jernej.skrabec@...il.com>; Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>; Maxime Ripard <mripard@...nel.org>; Thomas Zimmermann <tzimmermann@...e.de>; David Airlie <airlied@...il.com>; Simona Vetter <simona@...ll.ch>; AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>; dri-devel@...ts.freedesktop.org; linux-kernel@...r.kernel.org; Pet Weng (翁玉芬) <Pet.Weng@....com.tw>; Kenneth Hung (洪家倫) <Kenneth.Hung@....com.tw>; treapking@...omium.org
Subject: Re: [PATCH v3] drm/bridge: it6505: fix HDCP V match check is not performed correctly

On Thu, Jan 09, 2025 at 02:40:08PM +0800, Hermes Wu via B4 Relay wrote:
> From: Hermes Wu <Hermes.wu@....com.tw>
> 
> The loop of V compare is expected to iterate for 5 times which compare 
> V array form av[0][] to av[4][].
> It should check loop counter reach the last statement "i == 5"
> before return true
> 
> Fixes: 0989c02c7a5c ("drm/bridge: it6505: fix HDCP CTS compare V 
> matching")
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>Excuse me, where did you get that from?? I didn't r-b it (yet).

Sorry,

I think I just missing understanding about this tag.
I thought it should add if someone give advice to a path.

So I add it before you r-b it,

> Signed-off-by: Hermes Wu <Hermes.wu@....com.tw>
> ---
> Changes in v3:
> - The V value compare loop from i = 0 to i = 4 and shall exit with i == 5 
>   if all V element matches
> - Link to v2: 
> https://lore.kernel.org/r/20250109-fix-hdcp-v-comp-v2-1-7dce0a59523f@i
> te.com.tw
> 
> Changes in v2:
> - pull the check of statment "i" out of V value check loop
> - Link to v1: 
> https://lore.kernel.org/r/20250108-fix-hdcp-v-comp-v1-1-9404811825cd@i
> te.com.tw
> ---
>  drivers/gpu/drm/bridge/ite-it6505.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
>--
>With best wishes
>Dmitry

Br.
Hermes