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From:   Yunfei Dong <yunfei.dong@mediatek.com>
To:     Yunfei Dong <yunfei.dong@mediatek.com>,
        Chen-Yu Tsai <wenst@chromium.org>,
        Nicolas Dufresne <nicolas@ndufresne.ca>,
        Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        Benjamin Gaignard <benjamin.gaignard@collabora.com>,
        Tiffany Lin <tiffany.lin@mediatek.com>
CC:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Hsin-Yi Wang <hsinyi@chromium.org>,
        Fritz Koenig <frkoenig@chromium.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        Steve Cho <stevecho@chromium.org>,
        <linux-media@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-mediatek@lists.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@mediatek.com>
Subject: [PATCH v3,5/7] media: mediatek: vcodec: remove unused lat_buf
Date:   Thu, 12 Jan 2023 12:11:38 +0800
Message-ID: <20230112041140.833-6-yunfei.dong@mediatek.com>
In-Reply-To: <20230112041140.833-1-yunfei.dong@mediatek.com>
References: <20230112041140.833-1-yunfei.dong@mediatek.com>
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Remove unused lat_buf from core list, or leading to core list access
NULL point.

Fixes: 365e4ba01df4 ("media: mtk-vcodec: Add work queue for core hardware decode")
Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
---
 .../platform/mediatek/vcodec/vdec_msg_queue.c  | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c b/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c
index ce7c82e38103..cdc539a46cb9 100644
--- a/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c
+++ b/drivers/media/platform/mediatek/vcodec/vdec_msg_queue.c
@@ -177,7 +177,7 @@ bool vdec_msg_queue_wait_lat_buf_full(struct vdec_msg_queue *msg_queue)
 	struct vdec_lat_buf *buf, *tmp;
 	struct list_head *list_core[3];
 	struct vdec_msg_queue_ctx *core_ctx;
-	int ret, i, in_core_count = 0;
+	int ret, i, in_core_count = 0, count = 0;
 	long timeout_jiff;
 
 	core_ctx = &msg_queue->ctx->dev->msg_queue_core_ctx;
@@ -204,8 +204,20 @@ bool vdec_msg_queue_wait_lat_buf_full(struct vdec_msg_queue *msg_queue)
 			       msg_queue->lat_ctx.ready_num);
 		return true;
 	}
-	mtk_v4l2_err("failed with lat buf isn't full: %d",
-		     msg_queue->lat_ctx.ready_num);
+
+	spin_lock(&core_ctx->ready_lock);
+	list_for_each_entry_safe(buf, tmp, &core_ctx->ready_queue, core_list) {
+		if (buf && buf->ctx == msg_queue->ctx) {
+			count++;
+			list_del(&buf->core_list);
+		}
+	}
+	spin_unlock(&core_ctx->ready_lock);
+
+	mtk_v4l2_err("failed with lat buf isn't full: list(%d %d) count:%d",
+		     atomic_read(&msg_queue->lat_list_cnt),
+		     atomic_read(&msg_queue->core_list_cnt), count);
+
 	return false;
 }
 
-- 
2.18.0