linux-kernel - [PATCH AUTOSEL 5.10 089/114] media: v4l: Memset argument to 0 before calling get_mbus

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Message-Id: <20250505231817.2697367-89-sashal@kernel.org>
Date: Mon,  5 May 2025 19:17:52 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Hans Verkuil <hverkuil@...all.nl>,
	Sasha Levin <sashal@...nel.org>,
	mchehab@...nel.org,
	laurent.pinchart+renesas@...asonboard.com,
	umang.jain@...asonboard.com,
	prabhakar.mahadev-lad.rj@...renesas.com,
	tomm.merciai@...il.com,
	linux-media@...r.kernel.org
Subject: [PATCH AUTOSEL 5.10 089/114] media: v4l: Memset argument to 0 before calling get_mbus_config pad op

From: Sakari Ailus <sakari.ailus@...ux.intel.com>

[ Upstream commit 91d6a99acfa5ce9f95ede775074b80f7193bd717 ]

Memset the config argument to get_mbus_config V4L2 sub-device pad
operation to zero before calling the operation. This ensures the callers
don't need to bother with it nor the implementations need to set all
fields that may not be relevant to them.

Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Signed-off-by: Hans Verkuil <hverkuil@...all.nl>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 2 ++
 include/media/v4l2-subdev.h           | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index fbf0dcb313c82..67d3e6511a146 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -312,6 +312,8 @@ static int call_enum_dv_timings(struct v4l2_subdev *sd,
 static int call_get_mbus_config(struct v4l2_subdev *sd, unsigned int pad,
 				struct v4l2_mbus_config *config)
 {
+	memset(config, 0, sizeof(*config));
+
 	return check_pad(sd, pad) ? :
 	       sd->ops->pad->get_mbus_config(sd, pad, config);
 }
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 73150520c02d4..ffc6d122f91e5 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -676,7 +676,9 @@ struct v4l2_subdev_pad_config {
  *		     possible configuration from the remote end, likely calling
  *		     this operation as close as possible to stream on time. The
  *		     operation shall fail if the pad index it has been called on
- *		     is not valid or in case of unrecoverable failures.
+ *		     is not valid or in case of unrecoverable failures. The
+ *		     config argument has been memset to 0 just before calling
+ *		     the op.
  *
  * @set_mbus_config: set the media bus configuration of a remote sub-device.
  *		     This operations is intended to allow, in combination with
-- 
2.39.5