linux-kernel - [PATCH v8 40/53] media: usb: hackrf: Set min_buffers

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Date:   Wed, 27 Sep 2023 17:35:45 +0200
From:   Benjamin Gaignard <benjamin.gaignard@...labora.com>
To:     mchehab@...nel.org, tfiga@...omium.org, m.szyprowski@...sung.com,
        ming.qian@....com, ezequiel@...guardiasur.com.ar,
        p.zabel@...gutronix.de, gregkh@...uxfoundation.org,
        hverkuil-cisco@...all.nl, nicolas.dufresne@...labora.com
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, linux-staging@...ts.linux.dev,
        kernel@...labora.com,
        Benjamin Gaignard <benjamin.gaignard@...labora.com>
Subject: [PATCH v8 40/53] media: usb: hackrf: Set min_buffers_needed to 8

vb2 queue_setup checks for a minimum number of buffers so set
min_buffers_needed to 8 and remove the useless check in
hackrf_queue_setup().

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
---
 drivers/media/usb/hackrf/hackrf.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/media/usb/hackrf/hackrf.c b/drivers/media/usb/hackrf/hackrf.c
index 3e535be2c520..2e856b20aa21 100644
--- a/drivers/media/usb/hackrf/hackrf.c
+++ b/drivers/media/usb/hackrf/hackrf.c
@@ -754,15 +754,10 @@ static int hackrf_queue_setup(struct vb2_queue *vq,
 {
 	struct hackrf_dev *dev = vb2_get_drv_priv(vq);
 
-	dev_dbg(dev->dev, "nbuffers=%d\n", *nbuffers);
-
-	/* Need at least 8 buffers */
-	if (vq->num_buffers + *nbuffers < 8)
-		*nbuffers = 8 - vq->num_buffers;
 	*nplanes = 1;
 	sizes[0] = PAGE_ALIGN(dev->buffersize);
 
-	dev_dbg(dev->dev, "nbuffers=%d sizes[0]=%d\n", *nbuffers, sizes[0]);
+	dev_dbg(dev->dev, "nbuffers=%u sizes[0]=%d\n", vb2_get_num_buffers(vq), sizes[0]);
 	return 0;
 }
 
@@ -1392,6 +1387,8 @@ static int hackrf_probe(struct usb_interface *intf,
 	dev->rx_vb2_queue.type = V4L2_BUF_TYPE_SDR_CAPTURE;
 	dev->rx_vb2_queue.io_modes = VB2_MMAP | VB2_USERPTR | VB2_DMABUF |
 				     VB2_READ;
+	/* Need at least 8 buffers */
+	dev->rx_vb2_queue.min_buffers_needed = 8;
 	dev->rx_vb2_queue.ops = &hackrf_vb2_ops;
 	dev->rx_vb2_queue.mem_ops = &vb2_vmalloc_memops;
 	dev->rx_vb2_queue.drv_priv = dev;
-- 
2.39.2