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: 6de8d628 ("media: amphion: add v4l2 m2m vpu decoder stateful driver")
Signed-off-by: Ming Qian <ming.qian@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/amphion/vdec.c

@@ -286,6 +286,7 @@ 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;
@@ -303,6 +304,7 @@ 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;
 }