Re: [PATCH] media: renesas: rzv2h-ivc: manage runtime PM with devres

Hello Myeonghun

On Tue, Aug 04, 2026 at 11:11:04PM +0900, Myeonghun Pak wrote:
> Runtime PM is enabled before the IRQ is looked up.  If that lookup
> fails, probe returns without disabling runtime PM.  The subdevice
> initialization error path disables runtime PM but leaves autosuspend
> enabled, while the remove path does neither.
>
> Use devm_pm_runtime_enable() so the driver core disables autosuspend and
> runtime PM on every failed probe and after remove.  This also makes the
> manual subdevice error unwind unnecessary.
>
> This issue was identified during our ongoing static-analysis research while
> reviewing kernel code.
>
> Fixes: f0b3984d821b ("media: platform: Add Renesas Input Video Control block driver")
> Signed-off-by: Ijae Kim <[email protected]>
> Signed-off-by: Myeonghun Pak <[email protected]>
> ---
>  .../media/platform/renesas/rzv2h-ivc/rzv2h-ivc-dev.c  | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-dev.c b/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-dev.c
> index 355842abb24b..48f9fd818bff 100644
> --- a/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-dev.c
> +++ b/drivers/media/platform/renesas/rzv2h-ivc/rzv2h-ivc-dev.c
> @@ -202,7 +202,9 @@ static int rzv2h_ivc_probe(struct platform_device *pdev)
>
>  	pm_runtime_set_autosuspend_delay(dev, 2000);
>  	pm_runtime_use_autosuspend(dev);
> -	pm_runtime_enable(dev);
> +	ret = devm_pm_runtime_enable(dev);
> +	if (ret)
> +		return ret;
>
>  	ivc->irqnum = platform_get_irq(pdev, 0);
>  	if (ivc->irqnum < 0)
> @@ -210,14 +212,9 @@ static int rzv2h_ivc_probe(struct platform_device *pdev)
>
>  	ret = rzv2h_ivc_initialise_subdevice(ivc);
>  	if (ret)
> -		goto err_disable_pm_runtime;
> +		return ret;
>
>  	return 0;
> -
> -err_disable_pm_runtime:
> -	pm_runtime_disable(dev);
> -
> -	return ret;
>  }
>
>  static void rzv2h_ivc_remove(struct platform_device *pdev)

The deveres managed version of pm_runtime_enable() calls

	pm_runtime_dont_use_autosuspend(data);
	pm_runtime_disable(data);

So this version is already better than what we have here.

Reviewed-by: Jacopo Mondi <[email protected]>

We don't seem to forcefully suspend the device at remove time. The
device is only active during streaming and I don't think the driver can
be removed (or unbind) while it's actively streaming ?

> --
> 2.47.1
>