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

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Date:	Sat, 26 Sep 2015 14:37:19 +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,

> -----Original Message-----
> From: linux-pm-owner@...r.kernel.org [mailto:linux-pm-
> owner@...r.kernel.org] On Behalf Of Rafael J. Wysocki
> Sent: Friday, September 25, 2015 9:57 PM
> 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 Friday, September 25, 2015 06:42:41 AM Chen, Yu C wrote:
> > 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:
> > > > +#ifdef CONFIG_SUSPEND
> > > > +	set_wake_irq_freeze(irq);
> > > > +#endif
> 
> Alternatively, you can define an empty static inline stub of
> set_wake_irq_freeze() for CONFIG_SUSPEND and avoid using IS_ENABLED()
> even.
> 
> But I'd rather define a global acpi_irq variable, store irq in it and access it
> directly from acpi_freeze_prepare().  And it doesn't have to depend on
> CONFIG_SUSPEND as it is just the IRQ number actually used by ACPI.
> 
OK, I've convert it to a global variable acpi_inuse_irq.

> BTW, I wonder if there are other places using acpi_gbl_FADT.sci_interrupt
> directly which they shouldn't do?
> 
I searched the code and found there are two other potential misuse of 
acpi_gbl_FADT.sci_interrupt, they are in acpi_os_remove_interrupt_handler
and acpi_os_wait_events_complete, so I sent out a version 2 patch
for them.

> > Oh, do you mean the naming for this variable is un-suitable? OK, I'll
> > change it to acpi_freeze_wake_irq
> 
> No.  What I mean is that in theory there may be multiple ACPI interrupts.
> 
> But you need not care about this case because of the
> 
> 	if (gsi != acpi_gbl_FADT.sci_interrupt)
> 		return AE_BAD_PARAMETER;
> check in acpi_os_install_interrupt_handler().
> 
OK, thanks!

Best Regards,
Yu