linux-kernel - [PATCH v1 13/24] media: rkvdec: h264: Fix reference frame

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Date:   Mon, 28 Mar 2022 15:59:25 -0400
From:   Nicolas Dufresne <nicolas.dufresne@...labora.com>
To:     Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     kernel@...labora.com, Jonas Karlman <jonas@...boo.se>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v1 13/24] media: rkvdec: h264: Fix reference frame_num wrap for second field

From: Jonas Karlman <jonas@...boo.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@...boo.se>
Reviewed-by: Ezequiel Garcia <ezequiel@...labora.com>
---
 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