linux-kernel - [PATCH] media: amphion: add lock around vdec_g

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Date:   Tue,  1 Nov 2022 16:04:20 +0800
From:   Ming Qian <ming.qian@....com>
To:     mchehab@...nel.org, hverkuil-cisco@...all.nl
Cc:     shawnguo@...nel.org, robh+dt@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        xiahong.bao@....com, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH] media: amphion: add lock around vdec_g_fmt

the capture format may be changed when
sequence header is parsed,
it may be read and write in the same time,
add lock around vdec_g_fmt to synchronize it

Fixes: 6de8d628df6e ("media: amphion: add v4l2 m2m vpu decoder stateful driver")
Signed-off-by: Ming Qian <ming.qian@....com>
---
 drivers/media/platform/amphion/vdec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/media/platform/amphion/vdec.c b/drivers/media/platform/amphion/vdec.c
index 0d7676eee5ea..87f9f8e90ab1 100644
--- a/drivers/media/platform/amphion/vdec.c
+++ b/drivers/media/platform/amphion/vdec.c
@@ -314,6 +314,7 @@ static int vdec_g_fmt(struct file *file, void *fh, struct v4l2_format *f)
 	struct vpu_format *cur_fmt;
 	int i;
 
+	vpu_inst_lock(inst);
 	cur_fmt = vpu_get_format(inst, f->type);
 
 	pixmp->pixelformat = cur_fmt->pixfmt;
@@ -331,6 +332,7 @@ static int vdec_g_fmt(struct file *file, void *fh, struct v4l2_format *f)
 	f->fmt.pix_mp.xfer_func = vdec->codec_info.transfer_chars;
 	f->fmt.pix_mp.ycbcr_enc = vdec->codec_info.matrix_coeffs;
 	f->fmt.pix_mp.quantization = vdec->codec_info.full_range;
+	vpu_inst_unlock(inst);
 
 	return 0;
 }
-- 
2.38.1