media: rtl2832_sdr: assign vb2 lock before vb2_queue_init

Commit c780d01 ("media: vb2: vb2_core_queue_init(): sanity check lock
and wait_prepare/finish") added a sanity check to ensure that if there are
no wait_prepare/finish callbacks set by the driver, then the vb2_queue lock
must be set, since otherwise the vb2 core cannot do correct locking.

The rtl2832_sdr.c triggered this warning: it turns out that while the
driver does set this lock, it sets it too late. So move it up to before
the vb2_queue_init() call.

Reported-by: Arthur Marsh <arthur.marsh@internode.on.net>
Closes: https://lore.kernel.org/linux-media/20241211042355.8479-1-user@am64/
Fixes: 8fcd279 ("media: rtl2832_sdr: drop vb2_ops_wait_prepare/finish")
Cc: stable@vger.kernel.org
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

drivers/media/dvb-frontends/rtl2832_sdr.c

@@ -1363,6 +1363,7 @@ static int rtl2832_sdr_probe(struct platform_device *pdev)
 	dev->vb_queue.ops = &rtl2832_sdr_vb2_ops;
 	dev->vb_queue.mem_ops = &vb2_vmalloc_memops;
 	dev->vb_queue.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
+	dev->vb_queue.lock = &dev->vb_queue_lock;
 	ret = vb2_queue_init(&dev->vb_queue);
 	if (ret) {
 		dev_err(&pdev->dev, "Could not initialize vb2 queue\n");
@@ -1421,7 +1422,6 @@ static int rtl2832_sdr_probe(struct platform_device *pdev)
 	/* Init video_device structure */
 	dev->vdev = rtl2832_sdr_template;
 	dev->vdev.queue = &dev->vb_queue;
-	dev->vdev.queue->lock = &dev->vb_queue_lock;
 	video_set_drvdata(&dev->vdev, dev);
 
 	/* Register the v4l2_device structure */