linux-kernel - [PATCH v2] media: mediatek: vcodec: Return NULL if no vdec

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Message-ID: <20230703035905.28247-1-irui.wang@mediatek.com>
Date:   Mon, 3 Jul 2023 11:59:05 +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 v2] media: mediatek: vcodec: Return NULL if no vdec_fb is found

"fb_use_list" is used to store used or referenced frame buffers for
vp9 stateful decoder. "NULL" should be returned when getting target
frame buffer failed from "fb_use_list", not a random unexpected one.

Signed-off-by: Irui Wang <irui.wang@...iatek.com>
---
changed with v1:
- remove the added flag variable.
- update commit message.
---
 drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

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..a27a109d8d14 100644
--- a/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c
+++ b/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c
@@ -226,10 +226,11 @@ static struct vdec_fb *vp9_rm_from_fb_use_list(struct vdec_vp9_inst
 		if (fb->base_y.va == addr) {
 			list_move_tail(&node->list,
 				       &inst->available_fb_node_list);
-			break;
+			return fb;
 		}
 	}
-	return fb;
+
+	return NULL;
 }
 
 static void vp9_add_to_fb_free_list(struct vdec_vp9_inst *inst,
-- 
2.18.0