linux-kernel - [PATCH v8 41/53] media: usb: usbtv: Set min_buffers

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Date:   Wed, 27 Sep 2023 17:35:46 +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 41/53] media: usb: usbtv: Set min_buffers_needed to 2

vb2 queue_setup checks for a minimum number of buffers so set
min_buffers_needed to 2 and remove the useless check in
usbtv_queue_setup().

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
---
 drivers/media/usb/usbtv/usbtv-video.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/media/usb/usbtv/usbtv-video.c b/drivers/media/usb/usbtv/usbtv-video.c
index 1e30e05953dc..0e9e860be47f 100644
--- a/drivers/media/usb/usbtv/usbtv-video.c
+++ b/drivers/media/usb/usbtv/usbtv-video.c
@@ -727,8 +727,6 @@ static int usbtv_queue_setup(struct vb2_queue *vq,
 	struct usbtv *usbtv = vb2_get_drv_priv(vq);
 	unsigned size = USBTV_CHUNK * usbtv->n_chunks * 2 * sizeof(u32);
 
-	if (vq->num_buffers + *nbuffers < 2)
-		*nbuffers = 2 - vq->num_buffers;
 	if (*nplanes)
 		return sizes[0] < size ? -EINVAL : 0;
 	*nplanes = 1;
@@ -892,6 +890,7 @@ int usbtv_video_init(struct usbtv *usbtv)
 	/* videobuf2 structure */
 	usbtv->vb2q.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 	usbtv->vb2q.io_modes = VB2_MMAP | VB2_USERPTR | VB2_READ;
+	usbtv->vb2q.min_buffers_needed = 2;
 	usbtv->vb2q.drv_priv = usbtv;
 	usbtv->vb2q.buf_struct_size = sizeof(struct usbtv_buf);
 	usbtv->vb2q.ops = &usbtv_vb2_ops;
-- 
2.39.2