Re: [PATCH] counter: ti-eqep: Fix runtime PM error handling in probe

[William Breathitt Gray <wbg@kernel.org>]

On Tue, Sep 22, 2026 at 10:21:46AM +0700, phucduc.bui@gmail.com wrote:
> From: bui duc phuc <phucduc.bui@gmail.com>
> 
> pm_runtime_get_sync() errors were not checked, and if
> devm_clk_get_enabled() failed afterwards, the function returned without
> calling pm_runtime_put_sync()/pm_runtime_disable(), leaking the runtime PM
> usage count.
> 
> Switch to pm_runtime_resume_and_get() and add proper error unwinding via
> goto labels so every failure path after pm_runtime_enable() is cleaned up
> correctly.
> 
> Fixes: f213729f6796 ("counter: new TI eQEP driver")
> Signed-off-by: bui duc phuc <phucduc.bui@gmail.com>

Hello,

This patch looks similar to another we're considering for ti-eqep.[^1]
Perhaps you can provide a review or comment in that discussion thread so
we can address this issue together.

William Breathitt Gray

[^1]: https://lore.kernel.org/all/20260529095834.2561-1-sozdayvek@gmail.com/

> ---
>  drivers/counter/ti-eqep.c | 27 +++++++++++++++++++--------
>  1 file changed, 19 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/counter/ti-eqep.c b/drivers/counter/ti-eqep.c
> index 0dda3f2b14c7..698a9920f20d 100644
> --- a/drivers/counter/ti-eqep.c
> +++ b/drivers/counter/ti-eqep.c
> @@ -544,20 +544,31 @@ static int ti_eqep_probe(struct platform_device *pdev)
>  	 * domain.
>  	 */
>  	pm_runtime_enable(dev);
> -	pm_runtime_get_sync(dev);
> +	err = pm_runtime_resume_and_get(dev);
> +	if (err < 0) {
> +		dev_err_probe(dev, err, "failed to enable runtime PM\n");
> +		goto err_runtime_disable;
> +	}
> 
>  	clk = devm_clk_get_enabled(dev, NULL);
> -	if (IS_ERR(clk))
> -		return dev_err_probe(dev, PTR_ERR(clk), "failed to enable clock\n");
> +	if (IS_ERR(clk)) {
> +		err = PTR_ERR(clk);
> +		dev_err_probe(dev, err, "failed to enable clock\n");
> +		goto err_runtime_put;
> +	}
> 
>  	err = counter_add(counter);
> -	if (err < 0) {
> -		pm_runtime_put_sync(dev);
> -		pm_runtime_disable(dev);
> -		return err;
> -	}
> +	if (err < 0)
> +		goto err_runtime_put;
> 
>  	return 0;
> +
> +err_runtime_put:
> +	pm_runtime_put_sync(dev);
> +err_runtime_disable:
> +	pm_runtime_disable(dev);
> +
> +	return err;
>  }
> 
>  static void ti_eqep_remove(struct platform_device *pdev)
> --
> 2.43.0
>