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From:   Benjamin Gaignard <benjamin.gaignard@collabora.com>
To:     mchehab@kernel.org, tfiga@chromium.org, m.szyprowski@samsung.com,
        ming.qian@nxp.com, ezequiel@vanguardiasur.com.ar,
        p.zabel@pengutronix.de, gregkh@linuxfoundation.org,
        hverkuil-cisco@xs4all.nl, nicolas.dufresne@collabora.com
Cc:     linux-media@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, linux-arm-msm@vger.kernel.org,
        linux-rockchip@lists.infradead.org, linux-staging@lists.linux.dev,
        kernel@collabora.com,
        Benjamin Gaignard <benjamin.gaignard@collabora.com>
Subject: [PATCH v10 08/54] media: visl: Use vb2_get_buffer() instead of directly access to buffers array
Date:   Tue,  3 Oct 2023 10:06:17 +0200
Message-Id: <20231003080704.43911-9-benjamin.gaignard@collabora.com>
In-Reply-To: <20231003080704.43911-1-benjamin.gaignard@collabora.com>
References: <20231003080704.43911-1-benjamin.gaignard@collabora.com>
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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@collabora.com>
---
 drivers/media/test-drivers/visl/visl-dec.c | 28 ++++++++++++++++------
 1 file changed, 21 insertions(+), 7 deletions(-)

diff --git a/drivers/media/test-drivers/visl/visl-dec.c b/drivers/media/test-drivers/visl/visl-dec.c
index 318d675e5668..ba20ea998d19 100644
--- a/drivers/media/test-drivers/visl/visl-dec.c
+++ b/drivers/media/test-drivers/visl/visl-dec.c
@@ -290,13 +290,20 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
 	for (i = 0; i < out_q->num_buffers; i++) {
 		char entry[] = "index: %u, state: %s, request_fd: %d, ";
 		u32 old_len = len;
-		char *q_status = visl_get_vb2_state(out_q->bufs[i]->state);
+		struct vb2_buffer *vb2;
+		char *q_status;
+
+		vb2 = vb2_get_buffer(out_q, i);
+		if (!vb2)
+			continue;
+
+		q_status = visl_get_vb2_state(vb2->state);
 
 		len += scnprintf(&buf[len], TPG_STR_BUF_SZ - len,
 				 entry, i, q_status,
-				 to_vb2_v4l2_buffer(out_q->bufs[i])->request_fd);
+				 to_vb2_v4l2_buffer(vb2)->request_fd);
 
-		len += visl_fill_bytesused(to_vb2_v4l2_buffer(out_q->bufs[i]),
+		len += visl_fill_bytesused(to_vb2_v4l2_buffer(vb2),
 					   &buf[len],
 					   TPG_STR_BUF_SZ - len);
 
@@ -342,13 +349,20 @@ static void visl_tpg_fill(struct visl_ctx *ctx, struct visl_run *run)
 	len = 0;
 	for (i = 0; i < cap_q->num_buffers; i++) {
 		u32 old_len = len;
-		char *q_status = visl_get_vb2_state(cap_q->bufs[i]->state);
+		struct vb2_buffer *vb2;
+		char *q_status;
+
+		vb2 = vb2_get_buffer(cap_q, i);
+		if (!vb2)
+			continue;
+
+		q_status = visl_get_vb2_state(vb2->state);
 
 		len += scnprintf(&buf[len], TPG_STR_BUF_SZ - len,
 				 "index: %u, status: %s, timestamp: %llu, is_held: %d",
-				 cap_q->bufs[i]->index, q_status,
-				 cap_q->bufs[i]->timestamp,
-				 to_vb2_v4l2_buffer(cap_q->bufs[i])->is_held);
+				 vb2->index, q_status,
+				 vb2->timestamp,
+				 to_vb2_v4l2_buffer(vb2)->is_held);
 
 		tpg_gen_text(&ctx->tpg, basep, line++ * line_height, 16, &buf[old_len]);
 		frame_dprintk(ctx->dev, run->dst->sequence, "%s", &buf[old_len]);
-- 
2.39.2