linux-kernel - RE: [PATCH][RFC] ACPI / PM: Fix incorrect wakeup irq setting before suspend-to-idle

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Date:	Fri, 25 Sep 2015 06:42:41 +0000
From:	"Chen, Yu C" <yu.c.chen@...el.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"jiang.liu@...ux.intel.com" <jiang.liu@...ux.intel.com>,
	"Zhang, Rui" <rui.zhang@...el.com>,
	"Brown, Len" <len.brown@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>
Subject: RE: [PATCH][RFC] ACPI / PM: Fix incorrect wakeup irq setting before
 suspend-to-idle

Hi,Rafael, thanks a lot for your review, will resend v2 version.

> -----Original Message-----
> From: Rafael J. Wysocki [mailto:rjw@...ysocki.net]
> Sent: Friday, September 25, 2015 9:24 AM
> To: Chen, Yu C
> Cc: Wysocki, Rafael J; jiang.liu@...ux.intel.com; Zhang, Rui; Brown, Len; linux-
> kernel@...r.kernel.org; linux-pm@...r.kernel.org
> Subject: Re: [PATCH][RFC] ACPI / PM: Fix incorrect wakeup irq setting before
> suspend-to-idle
> 
> On Monday, August 10, 2015 10:11:26 AM Chen Yu wrote:
> > Signed-off-by: Chen Yu <yu.c.chen@...el.com>
> 
> That would only really matter if GPE devices were used, but I've never seen a
> system using them in practice, so this is more of a theoretical issue.
> 
I haven't encountered this problem,  just find this suspicious 
when I was doing some other debugging.
> > ---
> >  drivers/acpi/osl.c   |  5 ++++-
> >  drivers/acpi/sleep.c | 20 ++++++++++++++++++--  drivers/acpi/sleep.h
> > |  5 +++++
> >  3 files changed, 27 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index
> > 3b8963f..8e1420a 100644
> > --- a/drivers/acpi/osl.c
> > +++ b/drivers/acpi/osl.c
> > @@ -850,7 +851,9 @@ acpi_os_install_interrupt_handler(u32 gsi,
> acpi_osd_handler handler,
> >  		       gsi);
> >  		return AE_OK;
> >  	}
> > -
> > +#ifdef CONFIG_SUSPEND
> > +	set_wake_irq_freeze(irq);
> > +#endif
> 
> Please don't use #ifdefs in function bodies.  You can use IS_ENABLED() for
> that.
> 
OK, will do.
> >  	acpi_irq_handler = handler;
> >  	acpi_irq_context = context;
> >  	if (request_irq(irq, acpi_irq, IRQF_SHARED, "acpi", acpi_irq)) {
> > diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c index
> > 2f0d4db..9e7b54e 100644
> > --- a/drivers/acpi/sleep.c
> > +++ b/drivers/acpi/sleep.c
> > @@ -620,6 +620,22 @@ static const struct platform_suspend_ops
> acpi_suspend_ops_old = {
> >  	.end = acpi_pm_end,
> >  	.recover = acpi_pm_finish,
> >  };
> > +static int wake_irq_freeze = -EINVAL;
> 
> There may be more than one of these in theory.
> 
Oh, do you mean the naming for this variable is un-suitable? OK, I'll change it to
acpi_freeze_wake_irq 
> > +
> > +int get_wake_irq_freeze(void)
> > +{
> > +	if (IS_ERR_VALUE(wake_irq_freeze))
> > +		return acpi_gbl_FADT.sci_interrupt;
> > +	else
> > +		return wake_irq_freeze;
> 
> That would look better this way IMO:
> 
> 	return IS_ERR_VALUE(wake_irq_freeze) ?
> 		acpi_gbl_FADT.sci_interrupt : wake_irq_freeze;
> 
OK, will do.

> > diff --git a/drivers/acpi/sleep.h b/drivers/acpi/sleep.h index
> > c797ffa..eca4fda 100644
> > --- a/drivers/acpi/sleep.h
> > +++ b/drivers/acpi/sleep.h
> > @@ -6,3 +6,8 @@ extern struct list_head acpi_wakeup_device_list;
> > extern struct mutex acpi_device_lock;
> >
> >  extern void acpi_resume_power_resources(void);
> > +
> > +#ifdef CONFIG_SUSPEND
> > +extern int get_wake_irq_freeze(void); extern void
> > +set_wake_irq_freeze(unsigned int irq); #endif
> 
> Is the #ifdef needed here at all?
> 
Will delete the #ifdef


Best Regards,
Yu