linux-kernel - [PATCH 5/5] media: mediatek: vcodec: Fix encoder multi-instance deadlock

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Message-ID: <20220716093808.29894-6-irui.wang@mediatek.com>
Date:   Sat, 16 Jul 2022 17:38:08 +0800
From:   Irui Wang <irui.wang@...iatek.com>
To:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tzung-Bi Shih <tzungbi@...omium.org>,
        <angelogioacchino.delregno@...labora.com>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>
CC:     Yong Wu <yong.wu@...iatek.com>,
        Maoguang Meng <maoguang.meng@...iatek.com>,
        Longfei Wang <longfei.wang@...iatek.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        Irui Wang <irui.wang@...iatek.com>,
        <linux-media@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>,
        <linux-mediatek@...ts.infradead.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: [PATCH 5/5] media: mediatek: vcodec: Fix encoder multi-instance deadlock

The vb2_queue lock can be set by encoder context, the deadlock
may occur when running multi-instance encoding if use device
mutex lock.

Signed-off-by: Irui Wang <irui.wang@...iatek.com>
---
 drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h     | 3 +++
 drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c     | 6 +++---
 drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c | 1 +
 3 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h
index ab80e1b1979e..25fe539e6db5 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_drv.h
@@ -324,6 +324,9 @@ struct mtk_vcodec_ctx {
 	int hw_id;
 
 	struct vdec_msg_queue msg_queue;
+
+	/*q_mutex: vb2_queue mutex*/
+	struct mutex q_mutex;
 };
 
 /*
diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
index c310bb1dbbcf..63e7fe958406 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
@@ -1300,7 +1300,7 @@ void mtk_vcodec_enc_set_default_params(struct mtk_vcodec_ctx *ctx)
 {
 	struct mtk_q_data *q_data;
 
-	ctx->m2m_ctx->q_lock = &ctx->dev->dev_mutex;
+	ctx->m2m_ctx->q_lock = &ctx->q_mutex;
 	ctx->fh.m2m_ctx = ctx->m2m_ctx;
 	ctx->fh.ctrl_handler = &ctx->ctrl_hdl;
 	INIT_WORK(&ctx->encode_work, mtk_venc_worker);
@@ -1435,7 +1435,7 @@ int mtk_vcodec_enc_queue_init(void *priv, struct vb2_queue *src_vq,
 	src_vq->ops		= &mtk_venc_vb2_ops;
 	src_vq->mem_ops		= &vb2_dma_contig_memops;
 	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
-	src_vq->lock		= &ctx->dev->dev_mutex;
+	src_vq->lock		= &ctx->q_mutex;
 	src_vq->dev		= &ctx->dev->plat_dev->dev;
 
 	ret = vb2_queue_init(src_vq);
@@ -1449,7 +1449,7 @@ int mtk_vcodec_enc_queue_init(void *priv, struct vb2_queue *src_vq,
 	dst_vq->ops		= &mtk_venc_vb2_ops;
 	dst_vq->mem_ops		= &vb2_dma_contig_memops;
 	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
-	dst_vq->lock		= &ctx->dev->dev_mutex;
+	dst_vq->lock		= &ctx->q_mutex;
 	dst_vq->dev		= &ctx->dev->plat_dev->dev;
 
 	return vb2_queue_init(dst_vq);
diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c
index 6b0688b4872d..782563e636e4 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc_drv.c
@@ -130,6 +130,7 @@ static int fops_vcodec_open(struct file *file)
 	INIT_LIST_HEAD(&ctx->list);
 	ctx->dev = dev;
 	init_waitqueue_head(&ctx->queue[0]);
+	mutex_init(&ctx->q_mutex);
 
 	ctx->type = MTK_INST_ENCODER;
 	ret = mtk_vcodec_enc_ctrls_setup(ctx);
-- 
2.18.0