linux-kernel - Re: [PATCH] [v2] usb: cdns3: Fix runtime PM imbalance on error

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Date:   Mon, 19 Apr 2021 11:55:10 +0800
From:   Peter Chen <peter.chen@...nel.org>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu, Pawel Laszczak <pawell@...ence.com>,
        Roger Quadros <rogerq@...nel.org>,
        Aswath Govindraju <a-govindraju@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v2] usb: cdns3: Fix runtime PM imbalance on error

On 21-04-12 13:49:07, Dinghao Liu wrote:
> When cdns3_gadget_start() fails, a pairing PM usage counter
> decrement is needed to keep the counter balanced.
> 
> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>

Applied, thanks.

Peter
> ---
> 
> Changelog:
> 
> v2: - Use pm_runtime_put_sync() to decrease refcount.
> ---
>  drivers/usb/cdns3/cdns3-gadget.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> index 582bfeceedb4..a49fc68ec2ef 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.c
> +++ b/drivers/usb/cdns3/cdns3-gadget.c
> @@ -3255,8 +3255,10 @@ static int __cdns3_gadget_init(struct cdns *cdns)
>  	pm_runtime_get_sync(cdns->dev);
>  
>  	ret = cdns3_gadget_start(cdns);
> -	if (ret)
> +	if (ret) {
> +		pm_runtime_put_sync(cdns->dev);
>  		return ret;
> +	}
>  
>  	/*
>  	 * Because interrupt line can be shared with other components in
> -- 
> 2.17.1
> 

-- 

Thanks,
Peter Chen