linux-kernel - [PATCH v10 10/54] media: dvb-core: Use vb2_get_buffer() instead of directly access to buffers array

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Message-Id: <20231003080704.43911-11-benjamin.gaignard@collabora.com>
Date:   Tue,  3 Oct 2023 10:06:19 +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>
Subject: [PATCH v10 10/54] media: dvb-core: 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>
---
 drivers/media/dvb-core/dvb_vb2.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/media/dvb-core/dvb_vb2.c b/drivers/media/dvb-core/dvb_vb2.c
index b322ef179f05..3a966fdf814c 100644
--- a/drivers/media/dvb-core/dvb_vb2.c
+++ b/drivers/media/dvb-core/dvb_vb2.c
@@ -355,12 +355,13 @@ int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req)
 int dvb_vb2_querybuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
 {
 	struct vb2_queue *q = &ctx->vb_q;
+	struct vb2_buffer *vb2 = vb2_get_buffer(q, b->index);
 
-	if (b->index >= q->num_buffers) {
-		dprintk(1, "[%s] buffer index out of range\n", ctx->name);
+	if (!vb2) {
+		dprintk(1, "[%s] invalid buffer index\n", ctx->name);
 		return -EINVAL;
 	}
-	vb2_core_querybuf(&ctx->vb_q, q->bufs[b->index], b);
+	vb2_core_querybuf(&ctx->vb_q, vb2, b);
 	dprintk(3, "[%s] index=%d\n", ctx->name, b->index);
 	return 0;
 }
@@ -385,13 +386,14 @@ int dvb_vb2_expbuf(struct dvb_vb2_ctx *ctx, struct dmx_exportbuffer *exp)
 int dvb_vb2_qbuf(struct dvb_vb2_ctx *ctx, struct dmx_buffer *b)
 {
 	struct vb2_queue *q = &ctx->vb_q;
+	struct vb2_buffer *vb2 = vb2_get_buffer(q, b->index);
 	int ret;
 
-	if (b->index >= q->num_buffers) {
-		dprintk(1, "[%s] buffer index out of range\n", ctx->name);
+	if (!vb2) {
+		dprintk(1, "[%s] invalid buffer index\n", ctx->name);
 		return -EINVAL;
 	}
-	ret = vb2_core_qbuf(&ctx->vb_q, q->bufs[b->index], b, NULL);
+	ret = vb2_core_qbuf(&ctx->vb_q, vb2, b, NULL);
 	if (ret) {
 		dprintk(1, "[%s] index=%d errno=%d\n", ctx->name,
 			b->index, ret);
-- 
2.39.2