linux-kernel - [PATCH v8 25/53] media: pci: cx18: Set correct value to min_buffers

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Date:   Wed, 27 Sep 2023 17:35:30 +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 25/53] media: pci: cx18: Set correct value to min_buffers_needed field

Set queue min_buffers_needed field to 3 and remove the useless
check.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
---
 drivers/media/pci/cx18/cx18-streams.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/media/pci/cx18/cx18-streams.c b/drivers/media/pci/cx18/cx18-streams.c
index 597472754c4c..6ed2c9fb882c 100644
--- a/drivers/media/pci/cx18/cx18-streams.c
+++ b/drivers/media/pci/cx18/cx18-streams.c
@@ -117,13 +117,6 @@ static int cx18_queue_setup(struct vb2_queue *vq,
 	else
 		szimage = cx->cxhdl.height * 720 * 2;
 
-	/*
-	 * Let's request at least three buffers: two for the
-	 * DMA engine and one for userspace.
-	 */
-	if (vq->num_buffers + *nbuffers < 3)
-		*nbuffers = 3 - vq->num_buffers;
-
 	if (*nplanes) {
 		if (*nplanes != 1 || sizes[0] < szimage)
 			return -EINVAL;
@@ -286,7 +279,11 @@ static int cx18_stream_init(struct cx18 *cx, int type)
 		s->vidq.ops = &cx18_vb2_qops;
 		s->vidq.mem_ops = &vb2_vmalloc_memops;
 		s->vidq.timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC;
-		s->vidq.min_buffers_needed = 2;
+		/*
+		 * Let's request at least three buffers: two for the
+		 * DMA engine and one for userspace.
+		 */
+		s->vidq.min_buffers_needed = 3;
 		s->vidq.gfp_flags = GFP_DMA32;
 		s->vidq.dev = &cx->pci_dev->dev;
 		s->vidq.lock = &cx->serialize_lock;
-- 
2.39.2