linux-kernel - RE: [PATCH 4/5 V2] usb: call pm_runtime_put_sync in pm_runtime_get

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Date:	Fri, 1 Mar 2013 02:07:54 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	"Li, Fei" <fei.li@...el.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"Lan, Tianyu" <tianyu.lan@...el.com>,
	"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
	"sarah.a.sharp@...ux.intel.com" <sarah.a.sharp@...ux.intel.com>
CC:	"rjw@...k.pl" <rjw@...k.pl>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 4/5 V2] usb: call pm_runtime_put_sync in
 pm_runtime_get_sync failed case



> -----Original Message-----
> From: Li, Fei
> Sent: Thursday, February 28, 2013 5:06 PM
> To: gregkh@...uxfoundation.org; Lan, Tianyu; stern@...land.harvard.edu;
> sarah.a.sharp@...ux.intel.com
> Cc: rjw@...k.pl; linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org; Liu,
> Chuansheng; Li, Fei
> Subject: [PATCH 4/5 V2] usb: call pm_runtime_put_sync in
> pm_runtime_get_sync failed case
> 
> 
> Even in failed case of pm_runtime_get_sync, the usage_count
> is incremented. In order to keep the usage_count with correct
> value and runtime power management to behave correctly, call
> pm_runtime_put(_sync) in such case.
> 
> Signed-off-by Liu Chuansheng <chuansheng.liu@...el.com>
> Signed-off-by: Li Fei <fei.li@...el.com>
> ---
>  drivers/usb/core/hub.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 5480352..f72dede 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -3148,12 +3148,13 @@ int usb_port_resume(struct usb_device *udev,
> pm_message_t msg)
> 
>  	if (port_dev->did_runtime_put) {
>  		status = pm_runtime_get_sync(&port_dev->dev);
> -		port_dev->did_runtime_put = false;
>  		if (status < 0) {
>  			dev_dbg(&udev->dev, "can't resume usb port, status %d\n",
>  					status);
> +			pm_runtime_put_sync(&port_dev->dev);
Rechecked the usb similar codes, in usb_autoresume_device() and usb_autopm_get_interface(),
when pm_runtime_get_sync() failed, the paired pm_runtime_put_sync() will be called.
Alan and Rafael, is it reasonable to consider this cleanup patch also? Thanks.

>  			return status;
>  		}
> +		port_dev->did_runtime_put = false;
>  	}
> 
>  	/* Skip the initial Clear-Suspend step for a remote wakeup */
> --
> 1.7.4.1
> 
>