Re: 2.6.30 enabling cpu1 on resume fails after suspend to memory
From: Rafael J. Wysocki
Date: Sun Jun 14 2009 - 08:00:22 EST
On Sunday 14 June 2009, Benjamin S. wrote:
> On Sun, 14 Jun 2009 13:19:40 +0200
> "Rafael J. Wysocki" <rjw@xxxxxxx> wrote:
> > On Sunday 14 June 2009, Benjamin S. wrote:
> > >
> > > On Sun, 14 Jun 2009 12:35:24 +0200
> > > "Rafael J. Wysocki" <rjw@xxxxxxx> wrote:
> > >
> > > > Thanks for the report, the problem seems to be related to the chipset, because
> > > > I'm unable to reproduce it with SB600 and a fairly new AMD CPU.
> > > >
> > > > Does the resume work if you comment out suspend_device_irqs() and
> > > > resume_device_irqs() in drivers/base/power/main.c ?
> > >
> > > Yes, 2.6.30 without the two lines resumes without problems.\
> > Does it help (with the two lines present again) if the kernel is compiled with
> > CONFIG_PCI_MSI unset?
> Yes, it works.
OK, we need some help.
Evidently, the change of the interrupt handling during suspend-resume,
commit 2ed8d2b3a81bdbb0418301628ccdb008ac9f40b7 (PM: Rework handling of
interrupts during suspend-resume) broke resume (specifically, the enabling of
nonboot CPUs) on the Benjamin's machine, but only if MSI support is enabled.
Also, resume works if suspend_device_irqs() and resume_device_irqs() in
drivers/base/power/main.c are commented out.
Is there anything the MSI code does in __enable_irq() and/or __disable_irq()
that might cause this problem to appear?
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