Re: [PATCH v15 30/56] media: test-drivers: Stop direct calls to queue num_buffers field

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Le 10/11/2023 à 10:35, Andrzej Pietrasiewicz a écrit :
Hi Benjamin,

W dniu 9.11.2023 o 17:34, Benjamin Gaignard pisze:
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.
If 'min_buffers_needed' is set remove useless checks in queue setup
functions.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxxxxx>
CC: Daniel Almeida <daniel.almeida@xxxxxxxxxxxxx>
---
  drivers/media/test-drivers/visl/visl-dec.c         | 4 ++--
  drivers/media/test-drivers/vivid/vivid-meta-cap.c  | 3 ---
  drivers/media/test-drivers/vivid/vivid-meta-out.c  | 5 +++--
  drivers/media/test-drivers/vivid/vivid-touch-cap.c | 5 +++--
  drivers/media/test-drivers/vivid/vivid-vbi-cap.c   | 3 ---
  drivers/media/test-drivers/vivid/vivid-vbi-out.c   | 3 ---
  drivers/media/test-drivers/vivid/vivid-vid-cap.c   | 3 ---
  drivers/media/test-drivers/vivid/vivid-vid-out.c   | 5 +----
  8 files changed, 9 insertions(+), 22 deletions(-)

diff --git a/drivers/media/test-drivers/visl/visl-dec.c b/drivers/media/test-drivers/visl/visl-dec.c
index ba20ea998d19..4672dc5e52bb 100644
--- a/drivers/media/test-drivers/visl/visl-dec.c
+++ b/drivers/media/test-drivers/visl/visl-dec.c
@@ -287,7 +287,7 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
      frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
        len = 0;
-    for (i = 0; i < out_q->num_buffers; i++) {
+    for (i = 0; i < vb2_get_num_buffers(out_q); i++) {
          char entry[] = "index: %u, state: %s, request_fd: %d, ";
          u32 old_len = len;
          struct vb2_buffer *vb2;
@@ -347,7 +347,7 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
      frame_dprintk(ctx->dev, run->dst->sequence, "%s\n", buf);
        len = 0;
-    for (i = 0; i < cap_q->num_buffers; i++) {
+    for (i = 0; i < vb2_get_num_buffers(cap_q); i++) {
          u32 old_len = len;
          struct vb2_buffer *vb2;
          char *q_status;
diff --git a/drivers/media/test-drivers/vivid/vivid-meta-cap.c b/drivers/media/test-drivers/vivid/vivid-meta-cap.c
index 780f96860a6d..0a718d037e59 100644
--- a/drivers/media/test-drivers/vivid/vivid-meta-cap.c
+++ b/drivers/media/test-drivers/vivid/vivid-meta-cap.c
@@ -30,9 +30,6 @@ static int meta_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
          sizes[0] = size;
      }
  -    if (vq->num_buffers + *nbuffers < 2)
-        *nbuffers = 2 - vq->num_buffers;
-
      *nplanes = 1;
      return 0;
  }
diff --git a/drivers/media/test-drivers/vivid/vivid-meta-out.c b/drivers/media/test-drivers/vivid/vivid-meta-out.c
index 95835b52b58f..4a569a6e58be 100644
--- a/drivers/media/test-drivers/vivid/vivid-meta-out.c
+++ b/drivers/media/test-drivers/vivid/vivid-meta-out.c
@@ -18,6 +18,7 @@ static int meta_out_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
                  struct device *alloc_devs[])
  {
      struct vivid_dev *dev = vb2_get_drv_priv(vq);
+    unsigned int q_num_bufs = vb2_get_num_buffers(vq);
      unsigned int size =  sizeof(struct vivid_meta_out_buf);
        if (!vivid_is_webcam(dev))
@@ -30,8 +31,8 @@ static int meta_out_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
          sizes[0] = size;
      }
  -    if (vq->num_buffers + *nbuffers < 2)
-        *nbuffers = 2 - vq->num_buffers;
+    if (q_num_bufs + *nbuffers < 2)
+        *nbuffers = 2 - q_num_bufs;
        *nplanes = 1;
      return 0;
diff --git a/drivers/media/test-drivers/vivid/vivid-touch-cap.c b/drivers/media/test-drivers/vivid/vivid-touch-cap.c
index c7f6e23df51e..4b3c6ea0afde 100644
--- a/drivers/media/test-drivers/vivid/vivid-touch-cap.c
+++ b/drivers/media/test-drivers/vivid/vivid-touch-cap.c
@@ -13,6 +13,7 @@ static int touch_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
                   struct device *alloc_devs[])
  {
      struct vivid_dev *dev = vb2_get_drv_priv(vq);
+    unsigned int q_num_bufs = vb2_get_num_buffers(vq);
      struct v4l2_pix_format *f = &dev->tch_format;
      unsigned int size = f->sizeimage;
  @@ -23,8 +24,8 @@ static int touch_cap_queue_setup(struct vb2_queue *vq, unsigned int *nbuffers,
          sizes[0] = size;
      }
  -    if (vq->num_buffers + *nbuffers < 2)
-        *nbuffers = 2 - vq->num_buffers;
+    if (q_num_bufs + *nbuffers < 2)
+        *nbuffers = 2 - q_num_bufs;
        *nplanes = 1;
      return 0;
diff --git a/drivers/media/test-drivers/vivid/vivid-vbi-cap.c b/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
index b65b02eeeb97..3840b3a664ac 100644
--- a/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
+++ b/drivers/media/test-drivers/vivid/vivid-vbi-cap.c
@@ -134,9 +134,6 @@ static int vbi_cap_queue_setup(struct vb2_queue *vq,
        sizes[0] = size;
  -    if (vq->num_buffers + *nbuffers < 2)
-        *nbuffers = 2 - vq->num_buffers;
-
      *nplanes = 1;
      return 0;
  }
diff --git a/drivers/media/test-drivers/vivid/vivid-vbi-out.c b/drivers/media/test-drivers/vivid/vivid-vbi-out.c
index cd56476902a2..434a10676417 100644
--- a/drivers/media/test-drivers/vivid/vivid-vbi-out.c
+++ b/drivers/media/test-drivers/vivid/vivid-vbi-out.c
@@ -30,9 +30,6 @@ static int vbi_out_queue_setup(struct vb2_queue *vq,
        sizes[0] = size;
  -    if (vq->num_buffers + *nbuffers < 2)
-        *nbuffers = 2 - vq->num_buffers;
-
      *nplanes = 1;
      return 0;
  }
diff --git a/drivers/media/test-drivers/vivid/vivid-vid-cap.c b/drivers/media/test-drivers/vivid/vivid-vid-cap.c
index 3a06df35a2d7..2804975fe278 100644
--- a/drivers/media/test-drivers/vivid/vivid-vid-cap.c
+++ b/drivers/media/test-drivers/vivid/vivid-vid-cap.c
@@ -117,9 +117,6 @@ static int vid_cap_queue_setup(struct vb2_queue *vq,
                      dev->fmt_cap->data_offset[p];
      }
  -    if (vq->num_buffers + *nbuffers < 2)
-        *nbuffers = 2 - vq->num_buffers;
-
      *nplanes = buffers;
        dprintk(dev, 1, "%s: count=%d\n", __func__, *nbuffers);

here the format specifier for "*nbuffers" is "%d"...

diff --git a/drivers/media/test-drivers/vivid/vivid-vid-out.c b/drivers/media/test-drivers/vivid/vivid-vid-out.c
index 184a6df2c29f..1653b2988f7e 100644
--- a/drivers/media/test-drivers/vivid/vivid-vid-out.c
+++ b/drivers/media/test-drivers/vivid/vivid-vid-out.c
@@ -73,12 +73,9 @@ static int vid_out_queue_setup(struct vb2_queue *vq,
                         vfmt->data_offset[p] : size;
      }
  -    if (vq->num_buffers + *nbuffers < 2)
-        *nbuffers = 2 - vq->num_buffers;
-
      *nplanes = planes;
  -    dprintk(dev, 1, "%s: count=%d\n", __func__, *nbuffers);
+    dprintk(dev, 1, "%s: count=%u\n", __func__, *nbuffers);

... but here you change it to "%u". Is there a reason for these two to be
different? I didn't notice it in the previous version but now it stands out
clearly. Probably you changed to %u because of the type returned by
vb2_get_num_buffers(). And, actually, *nbuffers _is_ unsigned, too.

Like you said *nbuffers is unsigned so %u sound for me.
The goal of this patch was to avoid vq->num_buffers usage not to clean up all the
file.
That could be done in other patch since there is lot to do here.

Regards,
Benjamin


Regards,

Andrzej

      for (p = 0; p < planes; p++)
          dprintk(dev, 1, "%s: size[%u]=%u\n", __func__, p, sizes[p]);
      return 0;





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