linux-kernel - Re: [PATCH v1] usb: dwc3: re-enable runtime PM after failed resume

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Message-ID: <20240907005829.ldaspnspaegq5m4t@synopsys.com>
Date: Sat, 7 Sep 2024 00:58:35 +0000
From: Thinh Nguyen <Thinh.Nguyen@...opsys.com>
To: Roy Luo <royluo@...gle.com>
CC: Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "badhri@...gle.com" <badhri@...gle.com>,
        "frank.wang@...k-chips.com" <frank.wang@...k-chips.com>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH v1] usb: dwc3: re-enable runtime PM after failed resume

On Fri, Sep 06, 2024, Roy Luo wrote:
> When dwc3_resume_common() returns an error, runtime pm is left in
> disabled state in dwc3_resume(). The next dwc3_suspend_common()

What issue did you see when dwc3_suspend_common is not skipped?

BR,
Thinh

> should be skipped as the device is already in suspended state but
> it's not because power.disable_depth is non-zero.
> Ensures runtime PM is always re-enabled even after failed resume
> attempts.
> 
> Fixes: 68c26fe58182 ("usb: dwc3: set pm runtime active before resume common")
> Cc: stable@...r.kernel.org
> Signed-off-by: Roy Luo <royluo@...gle.com>
> ---
>  drivers/usb/dwc3/core.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index ccc3895dbd7f..1928b074b2df 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -2537,7 +2537,7 @@ static int dwc3_suspend(struct device *dev)
>  static int dwc3_resume(struct device *dev)
>  {
>  	struct dwc3	*dwc = dev_get_drvdata(dev);
> -	int		ret;
> +	int		ret = 0;
>  
>  	pinctrl_pm_select_default_state(dev);
>  
> @@ -2547,12 +2547,11 @@ static int dwc3_resume(struct device *dev)
>  	ret = dwc3_resume_common(dwc, PMSG_RESUME);
>  	if (ret) {
>  		pm_runtime_set_suspended(dev);
> -		return ret;
>  	}
>  
>  	pm_runtime_enable(dev);
>  
> -	return 0;
> +	return ret;
>  }
>  
>  static void dwc3_complete(struct device *dev)
> 
> base-commit: ad618736883b8970f66af799e34007475fe33a68
> -- 
> 2.46.0.469.g59c65b2a67-goog
>