Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Tue, 29 Mar 2022 17:17:01 +0200
From:   Sebastian Fricke <sebastian.fricke@collabora.com>
To:     Nicolas Dufresne <nicolas.dufresne@collabora.com>
Cc:     Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        kernel@collabora.com, Jonas Karlman <jonas@kwiboo.se>,
        Ezequiel Garcia <ezequiel@collabora.com>,
        linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org,
        linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 13/24] media: rkvdec: h264: Fix reference frame_num
 wrap for second field
Message-ID: <20220329151701.nt3fem5cd2nwmerp@basti-XPS-13-9310>
References: <20220328195936.82552-1-nicolas.dufresne@collabora.com>
 <20220328195936.82552-14-nicolas.dufresne@collabora.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Disposition: inline
In-Reply-To: <20220328195936.82552-14-nicolas.dufresne@collabora.com>
Precedence: bulk

Hey Nicolas,

On 28.03.2022 15:59, Nicolas Dufresne wrote:
>From: Jonas Karlman <jonas@kwiboo.se>
>
>When decoding the second field in a complementary field pair the second
>field is sharing the same frame_num with the first field.
>
>Currently the frame_num for the first field is wrapped when it matches the
>field being decoded, this cause issues to decode the second field in a
>complementary field pair.
>
>Fix this by using inclusive comparison, less than or equal.
>
>Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
>Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com>
Reviewed-by: Sebastian Fricke <sebastian.fricke@collabora.com>

Greetings,
Sebastian

>---
> drivers/staging/media/rkvdec/rkvdec-h264.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/staging/media/rkvdec/rkvdec-h264.c b/drivers/staging/media/rkvdec/rkvdec-h264.c
>index dff89732ddd0..842d8cd80e90 100644
>--- a/drivers/staging/media/rkvdec/rkvdec-h264.c
>+++ b/drivers/staging/media/rkvdec/rkvdec-h264.c
>@@ -752,7 +752,7 @@ static void assemble_hw_rps(struct rkvdec_ctx *ctx,
> 			continue;
>
> 		if (dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM ||
>-		    dpb[i].frame_num < dec_params->frame_num) {
>+		    dpb[i].frame_num <= dec_params->frame_num) {
> 			p[i] = dpb[i].frame_num;
> 			continue;
> 		}
>-- 
>2.34.1
>