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

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Message-ID: <ofpb7annntdpa7lwdscozaftvmuuat47juwn55x3p2osjsei52@bjitidem3g7d>
Date: Thu, 9 Jan 2025 15:08:45 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: 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@....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

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).


> 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@ite.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@ite.com.tw
> ---
>  drivers/gpu/drm/bridge/ite-it6505.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 

-- 
With best wishes
Dmitry