linux-kernel - [PATCH v12 14/56] media: sti: hva: Use vb2_get_buffer() instead of directly access to buffers array

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Date:   Tue, 17 Oct 2023 16:47:14 +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>,
        Jean-Christophe Trotin <jean-christophe.trotin@...s.st.com>
Subject: [PATCH v12 14/56] media: sti: hva: Use vb2_get_buffer() instead of directly access to buffers array

Use vb2_get_buffer() instead of direct access to the vb2_queue bufs array.
This allows us to change the type of the bufs in the future.
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.
Remove index range test since it is done by vb2_get_buffer().

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
CC: Jean-Christophe Trotin <jean-christophe.trotin@...s.st.com>
---
 drivers/media/platform/st/sti/hva/hva-v4l2.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/st/sti/hva/hva-v4l2.c b/drivers/media/platform/st/sti/hva/hva-v4l2.c
index 3a848ca32a0e..cfe83e9dc01b 100644
--- a/drivers/media/platform/st/sti/hva/hva-v4l2.c
+++ b/drivers/media/platform/st/sti/hva/hva-v4l2.c
@@ -569,14 +569,11 @@ static int hva_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
 		struct vb2_buffer *vb2_buf;
 
 		vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, buf->type);
-
-		if (buf->index >= vq->num_buffers) {
-			dev_dbg(dev, "%s buffer index %d out of range (%d)\n",
-				ctx->name, buf->index, vq->num_buffers);
+		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;
 		}
-
-		vb2_buf = vb2_get_buffer(vq, buf->index);
 		stream = to_hva_stream(to_vb2_v4l2_buffer(vb2_buf));
 		stream->bytesused = buf->bytesused;
 	}
-- 
2.39.2