linux-kernel - [PATCH v5] media: nxp: Add dev_err_probe() to all error paths in *async

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [day] [month] [year] [list]
Message-Id: <20260121-cam_cleanup-v5-1-01d1ab38db9d@nxp.com>
Date: Wed, 21 Jan 2026 15:42:03 -0500
From: Frank Li <Frank.Li@....com>
To: Philipp Zabel <p.zabel@...gutronix.de>, 
 Mauro Carvalho Chehab <mchehab@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
 Sascha Hauer <s.hauer@...gutronix.de>, 
 Pengutronix Kernel Team <kernel@...gutronix.de>, 
 Fabio Estevam <festevam@...il.com>, Rui Miguel Silva <rmfrfs@...il.com>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Martin Kepplinger-Novakovic <martink@...teo.de>, 
 Purism Kernel Team <kernel@...i.sm>
Cc: linux-media@...r.kernel.org, imx@...ts.linux.dev, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Frank Li <Frank.Li@....com>
Subject: [PATCH v5] media: nxp: Add dev_err_probe() to all error paths in
 *async_register() helpers

Add dev_err_probe() to all error branches in the *async_register() helpers
to provide clearer diagnostic information when device registration fails.

Drop the explicit error message after returning from
mipi_csis_async_register(), as the error is already reported by this
helper.

Signed-off-by: Frank Li <Frank.Li@....com>
---
Some trivial patch to reduce goto at probe functions.
---
Changes in v5:
- rebase to https://gitlab.freedesktop.org/linux-media/users/pinchartl.git tags/next-media-nxp-20260120
- Link to v4: https://lore.kernel.org/r/20260116-cam_cleanup-v4-0-29ce01640443@nxp.com

Changes in v4:
- collect alex's review tag
- fix grammer in error message
- Link to v3: https://lore.kernel.org/r/20251215-cam_cleanup-v3-0-a61995068f38@nxp.com

Changes in v3:
- rebase to v6.19-rc1
- avoid use __free() == NULL according to cleanup.h
- Link to v2: https://lore.kernel.org/r/20251119-cam_cleanup-v2-0-df732cc83ff1@nxp.com

Changes in v2:
- add new patch media: nxp: Add dev_err_probe() to all error paths in *async_register() helpers
- detail change see each patch's change log.
- Link to v1: https://lore.kernel.org/r/20251117-cam_cleanup-v1-0-6cd42872db79@nxp.com
---
Change in v5
- remove "no functional change" in commit message
- fix error message.

change in v2
- new patch
---
 drivers/media/platform/nxp/imx-mipi-csis.c    | 31 ++++++++++++++++-----------
 drivers/media/platform/nxp/imx8mq-mipi-csi2.c | 27 ++++++++++++++---------
 2 files changed, 35 insertions(+), 23 deletions(-)

diff --git a/drivers/media/platform/nxp/imx-mipi-csis.c b/drivers/media/platform/nxp/imx-mipi-csis.c
index 9a43fd1eb0bcee7ac0c47f28ad89012de45a70d9..06ea96b8eaf61058d6979b7be747496480c4bc69 100644
--- a/drivers/media/platform/nxp/imx-mipi-csis.c
+++ b/drivers/media/platform/nxp/imx-mipi-csis.c
@@ -1359,18 +1359,18 @@ static int mipi_csis_async_register(struct mipi_csis_device *csis)
 		fwnode_graph_get_endpoint_by_id(dev_fwnode(csis->dev), 0, 0,
 						FWNODE_GRAPH_ENDPOINT_NEXT);
 	if (!ep)
-		return -ENOTCONN;
+		return dev_err_probe(csis->dev, -ENOTCONN,
+				     "failed to get local endpoint\n");
 
 	ret = v4l2_fwnode_endpoint_parse(ep, &vep);
 	if (ret)
-		return ret;
+		return dev_err_probe(csis->dev, ret,
+				     "failed to parse endpoint\n");
 
 	for (i = 0; i < vep.bus.mipi_csi2.num_data_lanes; ++i) {
-		if (vep.bus.mipi_csi2.data_lanes[i] != i + 1) {
-			dev_err(csis->dev,
-				"data lanes reordering is not supported");
-			return -EINVAL;
-		}
+		if (vep.bus.mipi_csi2.data_lanes[i] != i + 1)
+			return dev_err_probe(csis->dev, -EINVAL,
+					     "data lanes reordering is not supported\n");
 	}
 
 	csis->bus = vep.bus.mipi_csi2;
@@ -1382,15 +1382,22 @@ static int mipi_csis_async_register(struct mipi_csis_device *csis)
 	asd = v4l2_async_nf_add_fwnode_remote(&csis->notifier, ep,
 					      struct v4l2_async_connection);
 	if (IS_ERR(asd))
-		return PTR_ERR(asd);
+		return dev_err_probe(csis->dev, PTR_ERR(asd),
+				     "failed to add remote fnnode to notifier\n");
 
 	csis->notifier.ops = &mipi_csis_notify_ops;
 
 	ret = v4l2_async_nf_register(&csis->notifier);
 	if (ret)
-		return ret;
+		return dev_err_probe(csis->dev, ret,
+				     "failed to register notifier\n");
 
-	return v4l2_async_register_subdev(&csis->sd);
+	ret = v4l2_async_register_subdev(&csis->sd);
+	if (ret)
+		return dev_err_probe(csis->dev, ret,
+				     "failed to register subdev\n");
+
+	return 0;
 }
 
 /* -----------------------------------------------------------------------------
@@ -1549,10 +1556,8 @@ static int mipi_csis_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, &csis->sd);
 
 	ret = mipi_csis_async_register(csis);
-	if (ret < 0) {
-		dev_err(dev, "async register failed: %d\n", ret);
+	if (ret < 0)
 		goto err_cleanup;
-	}
 
 	/* Initialize debugfs. */
 	mipi_csis_debugfs_init(csis);
diff --git a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
index 9d946b68cf59d9f4fb3413fc90219efd380d9d95..8304b3d3a338394d6325929d28aa69d865ac8a92 100644
--- a/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
+++ b/drivers/media/platform/nxp/imx8mq-mipi-csi2.c
@@ -727,18 +727,18 @@ static int imx8mq_mipi_csi_async_register(struct csi_state *state)
 		fwnode_graph_get_endpoint_by_id(dev_fwnode(state->dev), 0, 0,
 						FWNODE_GRAPH_ENDPOINT_NEXT);
 	if (!ep)
-		return -ENOTCONN;
+		return dev_err_probe(state->dev, -ENOTCONN,
+				     "failed to get remote endpoint fwnode\n");
 
 	ret = v4l2_fwnode_endpoint_parse(ep, &vep);
 	if (ret)
-		return ret;
+		return dev_err_probe(state->dev, ret,
+				     "failed to parse endpoint fwnode\n");
 
 	for (i = 0; i < vep.bus.mipi_csi2.num_data_lanes; ++i) {
-		if (vep.bus.mipi_csi2.data_lanes[i] != i + 1) {
-			dev_err(state->dev,
-				"data lanes reordering is not supported");
-			return -EINVAL;
-		}
+		if (vep.bus.mipi_csi2.data_lanes[i] != i + 1)
+			return dev_err_probe(state->dev, -EINVAL,
+					     "data lanes reordering is not supported");
 	}
 
 	state->bus = vep.bus.mipi_csi2;
@@ -750,15 +750,22 @@ static int imx8mq_mipi_csi_async_register(struct csi_state *state)
 	asd = v4l2_async_nf_add_fwnode_remote(&state->notifier, ep,
 					      struct v4l2_async_connection);
 	if (IS_ERR(asd))
-		return PTR_ERR(asd);
+		return dev_err_probe(state->dev, PTR_ERR(asd),
+				     "failed to add fwnode to notifier\n");
 
 	state->notifier.ops = &imx8mq_mipi_csi_notify_ops;
 
 	ret = v4l2_async_nf_register(&state->notifier);
 	if (ret)
-		return ret;
+		return dev_err_probe(state->dev, ret,
+				     "failed to register notifier\n");
 
-	return v4l2_async_register_subdev(&state->sd);
+	ret = v4l2_async_register_subdev(&state->sd);
+	if (ret)
+		return dev_err_probe(state->dev, ret,
+				     "failed to register subdev\n");
+
+	return 0;
 }
 
 /* -----------------------------------------------------------------------------

---
base-commit: b7af7c950e1076a9e3d855045571be2de4ce9f2c
change-id: 20250807-cam_cleanup-b6d90ba9dac3

Best regards,
--
Frank Li <Frank.Li@....com>