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

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Message-ID: <20210410010631.GA3862@b29397-desktop>
Date:   Sat, 10 Apr 2021 09:06:31 +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] usb: cdns3: Fix rumtime PM imbalance on error

On 21-04-07 13:22:26, 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>
> ---
>  drivers/usb/cdns3/cdns3-gadget.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/cdns3/cdns3-gadget.c b/drivers/usb/cdns3/cdns3-gadget.c
> index 582bfeceedb4..ad891a108aed 100644
> --- a/drivers/usb/cdns3/cdns3-gadget.c
> +++ b/drivers/usb/cdns3/cdns3-gadget.c
> @@ -3255,8 +3255,11 @@ 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_mark_last_busy(cdns->dev);
> +		pm_runtime_put_autosuspend(cdns->dev);
>  		return ret;

It doesn't need to delay entering runtime suspend, I prefer using pm_runtime_put_sync directly.

-- 

Thanks,
Peter Chen