linux-kernel - RE: [PATCH v3 5/5] PM / sleep: Asynchronous threads for suspend

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Date:	Tue, 18 Feb 2014 00:33:11 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"Brown, Len" <len.brown@...el.com>, "pavel@....cz" <pavel@....cz>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Li, Zhuangzhi" <zhuangzhi.li@...el.com>
Subject: RE: [PATCH v3 5/5] PM / sleep: Asynchronous threads for suspend_late

Hello Rafael,

> -----Original Message-----
> From: Rafael J. Wysocki [mailto:rjw@...ysocki.net]
> Sent: Tuesday, February 18, 2014 1:28 AM
> To: Liu, Chuansheng
> Cc: gregkh@...uxfoundation.org; Brown, Len; pavel@....cz;
> linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org; Li, Zhuangzhi
> Subject: Re: [PATCH v3 5/5] PM / sleep: Asynchronous threads for suspend_late
> 
> On Monday, February 17, 2014 02:19:14 PM Chuansheng Liu wrote:
> > In analogy with commits 5af84b82701a and 97df8c12995, using
> > asynchronous threads can improve the overall suspend_late
> > time significantly.
> >
> > This patch is for suspend_late phase.
> >
> > Signed-off-by: Chuansheng Liu <chuansheng.liu@...el.com>
> > ---
> >  drivers/base/power/main.c | 66
> ++++++++++++++++++++++++++++++++++++++---------
> >  1 file changed, 54 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
> > index 72b4c9c..c031050 100644
> > --- a/drivers/base/power/main.c
> > +++ b/drivers/base/power/main.c
> > @@ -1127,16 +1127,26 @@ static int dpm_suspend_noirq(pm_message_t
> state)
> >   *
> >   * Runtime PM is disabled for @dev while this function is being executed.
> >   */
> > -static int device_suspend_late(struct device *dev, pm_message_t state)
> > +static int __device_suspend_late(struct device *dev, pm_message_t state,
> bool async)
> >  {
> >  	pm_callback_t callback = NULL;
> >  	char *info = NULL;
> > -	int error;
> > +	int error = 0;
> > +
> > +	dpm_wait_for_children(dev, async);
> >
> 
> Like in patch [4/5], all of the "goto Complete" statements can go before
> the waiting.
> 
You are right, will do that in patch V4, thanks your reviewing.