linux-kernel - [PATCH v1 06/23] media: ccs: Discard pm_runtime

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Message-ID: <22966634.EfDdHjke4D@rafael.j.wysocki>
Date: Mon, 22 Dec 2025 21:03:25 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>, Ulf Hansson <ulf.hansson@...aro.org>,
 Brian Norris <briannorris@...omium.org>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, linux-media@...r.kernel.org
Subject: [PATCH v1 06/23] media: ccs: Discard pm_runtime_put() return value

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

Passing the pm_runtime_put() return value to callers is not particularly
useful.

Returning an error code from pm_runtime_put() merely means that it has
not queued up a work item to check whether or not the device can be
suspended and there are many perfectly valid situations in which that
can happen, like after writing "on" to the devices' runtime PM "control"
attribute in sysfs for one example.  It also happens when the kernel is
configured with CONFIG_PM unset.

Accordingly, update ccs_post_streamoff() to simply discard the return
value of pm_runtime_put() and always return success to the caller.

This will facilitate a planned change of the pm_runtime_put() return
type to void in the future.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

This patch is part of a series, but it doesn't depend on anything else
in that series.  The last patch in the series depends on it.

It can be applied by itself and if you decide to do so, please let me
know.

Otherwise, an ACK or equivalent will be appreciated, but also the lack
of specific criticism will be eventually regarded as consent.

---
 drivers/media/i2c/ccs/ccs-core.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/media/i2c/ccs/ccs-core.c
+++ b/drivers/media/i2c/ccs/ccs-core.c
@@ -1974,7 +1974,9 @@ static int ccs_post_streamoff(struct v4l
 	struct ccs_sensor *sensor = to_ccs_sensor(subdev);
 	struct i2c_client *client = v4l2_get_subdevdata(&sensor->src->sd);

-	return pm_runtime_put(&client->dev);
+	pm_runtime_put(&client->dev);
+
+	return 0;
 }

 static int ccs_enum_mbus_code(struct v4l2_subdev *subdev,