linux-kernel - Re: [PATCH] PM/Trace: get rid of synchronous resume limit during PM trace

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Message-ID: <2226940.FhLLx52rcO@vostro.rjw.lan>
Date:	Mon, 26 Jan 2015 14:44:15 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
Cc:	len.brown@...el.com, pavel@....cz,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-pm@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM/Trace: get rid of synchronous resume limit during PM trace

On Monday, January 26, 2015 03:59:59 PM Fu, Zhonghui wrote:
> 
> This is a incorrect patch , please ignore it.

Of course it is incorrect.

If it "fixes" anything for you, this means you need to reorder devices in dpm_list
on the given system.

> On 2015/1/26 13:07, Fu, Zhonghui wrote:
> > From f9c841d1f943d81b5ab0aac7483e794a7f966296 Mon Sep 17 00:00:00 2001
> > From: Zhonghui Fu <zhonghui.fu@...ux.intel.com>
> > Date: Mon, 26 Jan 2015 11:27:08 +0800
> > Subject: [PATCH] PM/Trace: get rid of synchronous resume limit during PM trace
> >
> > There are some kind of dependency between devices in some
> > hardware platforms. So, asynchronous resuming devices may
> > hang system due to wrong resume order. As a result, should
> > not fore synchronously resuming devices during tracing
> > PM events.
> >
> > Signed-off-by: Zhonghui Fu <zhonghui.fu@...ux.intel.com>
> > ---
> >  drivers/base/power/main.c    |    3 +--
> >  include/linux/resume-trace.h |    7 -------
> >  2 files changed, 1 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/base/power/main.c b/drivers/base/power/main.c
> > index 9717d5f..5df148b 100644
> > --- a/drivers/base/power/main.c
> > +++ b/drivers/base/power/main.c
> > @@ -517,8 +517,7 @@ static int device_resume_noirq(struct device *dev, pm_message_t state, bool asyn
> >  
> >  static bool is_async(struct device *dev)
> >  {
> > -	return dev->power.async_suspend && pm_async_enabled
> > -		&& !pm_trace_is_enabled();
> > +	return dev->power.async_suspend && pm_async_enabled;
> >  }
> >  
> >  static void async_resume_noirq(void *data, async_cookie_t cookie)
> > diff --git a/include/linux/resume-trace.h b/include/linux/resume-trace.h
> > index f31db23..fd0866e 100644
> > --- a/include/linux/resume-trace.h
> > +++ b/include/linux/resume-trace.h
> > @@ -7,11 +7,6 @@
> >  
> >  extern int pm_trace_enabled;
> >  
> > -static inline int pm_trace_is_enabled(void)
> > -{
> > -       return pm_trace_enabled;
> > -}
> > -
> >  struct device;
> >  extern void set_trace_device(struct device *);
> >  extern void generate_resume_trace(const void *tracedata, unsigned int user);
> > @@ -24,8 +19,6 @@ extern int show_trace_dev_match(char *buf, size_t size);
> >  
> >  #else
> >  
> > -static inline int pm_trace_is_enabled(void) { return 0; }
> > -
> >  #define TRACE_DEVICE(dev) do { } while (0)
> >  #define TRACE_RESUME(dev) do { } while (0)
> >  
> > -- 1.7.1
> >
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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