linux-kernel - [PATCH] media: mediatek: vcodec: Add a flag to indicate vdec

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Date:   Sat, 1 Jul 2023 17:05:21 +0800
From:   Irui Wang <irui.wang@...iatek.com>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     Yunfei Dong <yunfei.dong@...iatek.com>,
        Maoguang Meng <maoguang.meng@...iatek.com>,
        Irui Wang <irui.wang@...iatek.com>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        <linux-media@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: [PATCH] media: mediatek: vcodec: Add a flag to indicate vdec_fb finding status

"fb_use_list" is vp9 stateful decoder driver to store current
used or referenced frame buffer, and "fb_free_list" is used to
store current available to be freed frame buffer. When the
target frame buffer cannot be found in "fb_use_list", "NULL"
should be returned to prevent unexpected frame buffer from being
placed into "fb_free_list".

Signed-off-by: Irui Wang <irui.wang@...iatek.com>
---
 drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c b/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c
index 70b8383f7c8e..e77d5a2452c1 100644
--- a/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c
+++ b/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c
@@ -220,15 +220,21 @@ static struct vdec_fb *vp9_rm_from_fb_use_list(struct vdec_vp9_inst
 {
 	struct vdec_fb *fb = NULL;
 	struct vdec_fb_node *node;
+	bool found = false;
 
 	list_for_each_entry(node, &inst->fb_use_list, list) {
 		fb = (struct vdec_fb *)node->fb;
 		if (fb->base_y.va == addr) {
 			list_move_tail(&node->list,
 				       &inst->available_fb_node_list);
+			found = true;
 			break;
 		}
 	}
+
+	if (!found)
+		fb = NULL;
+
 	return fb;
 }
 
-- 
2.25.1