media: sample: v4l: Stop direct calls to queue num_buffers field

Use vb2_get_num_buffers() to avoid using queue num_buffers field directly.
This allows us to change how the number of buffers is computed in the
future.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

diff --git a/samples/v4l/v4l2-pci-skeleton.c b/samples/v4l/v4l2-pci-skeleton.c
index a61f94d..a65aa9d 100644 (file)
--- a/samples/v4l/v4l2-pci-skeleton.c
+++ b/samples/v4l/v4l2-pci-skeleton.c
@@ -155,6 +155,7 @@ static int queue_setup(struct vb2_queue *vq,
                       unsigned int sizes[], struct device *alloc_devs[])
 {
        struct skeleton *skel = vb2_get_drv_priv(vq);
+       unsigned int q_num_bufs = vb2_get_num_buffers(vq);
 
        skel->field = skel->format.field;
        if (skel->field == V4L2_FIELD_ALTERNATE) {
@@ -167,8 +168,8 @@ static int queue_setup(struct vb2_queue *vq,
                skel->field = V4L2_FIELD_TOP;
        }
 
-       if (vq->num_buffers + *nbuffers < 3)
-               *nbuffers = 3 - vq->num_buffers;
+       if (q_num_bufs + *nbuffers < 3)
+               *nbuffers = 3 - q_num_bufs;
 
        if (*nplanes)
                return sizes[0] < skel->format.sizeimage ? -EINVAL : 0;