linux-kernel - [PATCH v11 11/56] media: mediatek: jpeg: Use vb2_get_buffer() instead of directly access to buffers array

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Message-Id: <20231012114642.19040-12-benjamin.gaignard@collabora.com>
Date:   Thu, 12 Oct 2023 13:45:57 +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>,
        Bin Liu <bin.liu@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>
Subject: [PATCH v11 11/56] media: mediatek: jpeg: Use vb2_get_buffer() instead of directly access to buffers array

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
needed.
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@...labora.com>
CC: Bin Liu <bin.liu@...iatek.com>
CC: Matthias Brugger <matthias.bgg@...il.com>
---
 drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c b/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
index 7194f88edc0f..73a063b1569b 100644
--- a/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
+++ b/drivers/media/platform/mediatek/jpeg/mtk_jpeg_core.c
@@ -598,12 +598,11 @@ static int mtk_jpeg_qbuf(struct file *file, void *priv, struct v4l2_buffer *buf)
 		goto end;
 
 	vq = v4l2_m2m_get_vq(fh->m2m_ctx, buf->type);
-	if (buf->index >= vq->num_buffers) {
-		dev_err(ctx->jpeg->dev, "buffer index out of range\n");
+	vb = vb2_get_buffer(vq, buf->index);
+	if (!vb) {
+		dev_err(ctx->jpeg->dev, "buffer not found\n");
 		return -EINVAL;
 	}
-
-	vb = vq->bufs[buf->index];
 	jpeg_src_buf = mtk_jpeg_vb2_to_srcbuf(vb);
 	jpeg_src_buf->bs_size = buf->m.planes[0].bytesused;
 
-- 
2.39.2