Re: [PATCH v7 07/49] media: sti: hva: Use vb2_get_buffer() instead of directly access to buffers array

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Le 19/09/2023 à 11:31, Hans Verkuil a écrit :
On 14/09/2023 15:32, Benjamin Gaignard wrote:
Use vb2_get_buffer() instead of directly access to vb2_buffer buffer array.
This could allow to change the type bufs[] field of vb2_buffer structure if
After each call to vb2_get_buffer() we need to be sure that we get
a valid pointer so check the return value of all of them.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxxxxx>
  drivers/media/platform/st/sti/hva/hva-v4l2.c | 4 ++++
  1 file changed, 4 insertions(+)

diff --git a/drivers/media/platform/st/sti/hva/hva-v4l2.c b/drivers/media/platform/st/sti/hva/hva-v4l2.c
index 3a848ca32a0e..326be09bdb55 100644
--- a/drivers/media/platform/st/sti/hva/hva-v4l2.c
+++ b/drivers/media/platform/st/sti/hva/hva-v4l2.c
@@ -577,6 +577,10 @@ static int hva_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
Above this line there is a buf->index check...

vb2_buf = vb2_get_buffer(vq, buf->index);
+		if (!vb2_buf) {
+			dev_dbg(dev, "%s buffer index %d not found\n", ctx->name, buf->index);
+			return -EINVAL;
+		}
...I think that check can be dropped since vb2_get_buffer checks that already.

No because in "media: sti: hva: Stop direct calls to queue num_buffers field" patch
I remove the above check since it use queue num_buffers field.




  		stream = to_hva_stream(to_vb2_v4l2_buffer(vb2_buf));
  		stream->bytesused = buf->bytesused;

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