[PATCH v1 05/23] media: rkisp1: Discard pm_runtime_put() return value

[PATCH v1 05/23] media: rkisp1: Discard pm_runtime_put() return value

[Rafael J. Wysocki]

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

Printing error messages on pm_runtime_put() returning negative values
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.

Accordingly, update rkisp1_vb2_stop_streaming() to simply discard the
return value of pm_runtime_put().

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@intel.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/platform/rockchip/rkisp1/rkisp1-capture.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c
+++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c
@@ -1123,7 +1123,6 @@ static void rkisp1_vb2_stop_streaming(st
 	struct rkisp1_capture *cap = queue->drv_priv;
 	struct rkisp1_vdev_node *node = &cap->vnode;
 	struct rkisp1_device *rkisp1 = cap->rkisp1;
-	int ret;
 
 	mutex_lock(&cap->rkisp1->stream_lock);
 
@@ -1132,9 +1131,7 @@ static void rkisp1_vb2_stop_streaming(st
 	rkisp1_return_all_buffers(cap, VB2_BUF_STATE_ERROR);
 
 	v4l2_pipeline_pm_put(&node->vdev.entity);
-	ret = pm_runtime_put(rkisp1->dev);
-	if (ret < 0)
-		dev_err(rkisp1->dev, "power down failed error:%d\n", ret);
+	pm_runtime_put(rkisp1->dev);
 
 	rkisp1_dummy_buf_destroy(cap);
 

Re: [PATCH v1 05/23] media: rkisp1: Discard pm_runtime_put() return value

[Laurent Pinchart]

Hi Rafael,

Thank you for the patch.

On Mon, Dec 22, 2025 at 09:01:55PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Printing error messages on pm_runtime_put() returning negative values
> 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.
> 
> Accordingly, update rkisp1_vb2_stop_streaming() to simply discard the
> return value of pm_runtime_put().
> 
> 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@intel.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.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.

I've applied the patch to my tree for v6.20.

> Otherwise, an ACK or equivalent will be appreciated, but also the lack
> of specific criticism will be eventually regarded as consent.
> 
> ---
>  drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c |    5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c
> @@ -1123,7 +1123,6 @@ static void rkisp1_vb2_stop_streaming(st
>  	struct rkisp1_capture *cap = queue->drv_priv;
>  	struct rkisp1_vdev_node *node = &cap->vnode;
>  	struct rkisp1_device *rkisp1 = cap->rkisp1;
> -	int ret;
>  
>  	mutex_lock(&cap->rkisp1->stream_lock);
>  
> @@ -1132,9 +1131,7 @@ static void rkisp1_vb2_stop_streaming(st
>  	rkisp1_return_all_buffers(cap, VB2_BUF_STATE_ERROR);
>  
>  	v4l2_pipeline_pm_put(&node->vdev.entity);
> -	ret = pm_runtime_put(rkisp1->dev);
> -	if (ret < 0)
> -		dev_err(rkisp1->dev, "power down failed error:%d\n", ret);
> +	pm_runtime_put(rkisp1->dev);
>  
>  	rkisp1_dummy_buf_destroy(cap);
>  

-- 
Regards,

Laurent Pinchart

[PATCH v1 06/23] media: ccs: Discard pm_runtime_put() return value

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rafael.j.wysocki@intel.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@intel.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,

Re: [PATCH v1 06/23] media: ccs: Discard pm_runtime_put() return value

[Sakari Ailus]

Hi Rafael,

On Mon, Dec 22, 2025 at 09:03:25PM +0100, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.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@intel.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.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>

-- 
Sakari Ailus

[PATCH v1 07/23] media: mediatek: vcodec: Discard pm_runtime_put() return value

[Rafael J. Wysocki]

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

Printing error messages on pm_runtime_put() returning negative values
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.

Accordingly, update mtk_vcodec_enc_pw_off() and mtk_vcodec_dec_pw_off()
to simply discard the return value of pm_runtime_put().

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@intel.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/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_pm.c |    6 +-----
 drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_pm.c |    6 +-----
 2 files changed, 2 insertions(+), 10 deletions(-)

--- a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_pm.c
+++ b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_pm.c
@@ -67,11 +67,7 @@ static int mtk_vcodec_dec_pw_on(struct m
 
 static void mtk_vcodec_dec_pw_off(struct mtk_vcodec_pm *pm)
 {
-	int ret;
-
-	ret = pm_runtime_put(pm->dev);
-	if (ret && ret != -EAGAIN)
-		dev_err(pm->dev, "pm_runtime_put fail %d", ret);
+	pm_runtime_put(pm->dev);
 }
 
 static void mtk_vcodec_dec_clock_on(struct mtk_vcodec_pm *pm)
--- a/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_pm.c
+++ b/drivers/media/platform/mediatek/vcodec/encoder/mtk_vcodec_enc_pm.c
@@ -71,11 +71,7 @@ int mtk_vcodec_enc_pw_on(struct mtk_vcod
 
 void mtk_vcodec_enc_pw_off(struct mtk_vcodec_pm *pm)
 {
-	int ret;
-
-	ret = pm_runtime_put(pm->dev);
-	if (ret && ret != -EAGAIN)
-		dev_err(pm->dev, "pm_runtime_put fail %d", ret);
+	pm_runtime_put(pm->dev);
 }
 
 void mtk_vcodec_enc_clock_on(struct mtk_vcodec_pm *pm)